v3.26.3
Loans and the Allowance for Credit Losses - Summary of Amortized Cost Basis Loan Balances by Year of Origination and Credit Quality Indicator (Detail) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Financing Receivable, Recorded Investment [Line Items]    
Total loans $ 19,900,551 $ 19,226,432
30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 74,244 45,847
60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 26,011 48,523
90 Days or More Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 120,596 106,268
Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 16,929 13,974
Amortized Cost Basis by Origination Year 2025/2024 3,613 6,414
Amortized Cost Basis by Origination Year 2024/2023 8,188 6,262
Amortized Cost Basis by Origination Year 2023/2022 7,057 6,637
Amortized Cost Basis by Origination Year 2022/2021 7,462 2,842
Amortized Cost Basis by Origination Year, Prior to 2021/2020 30,506 28,125
Revolving Loans 1,153,615 1,047,746
Revolving Loans Converted to Term 13,441 17,394
Total loans 1,240,811 1,129,394
Home Equity [Member] | Current [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 16,929 13,731
Amortized Cost Basis by Origination Year 2025/2024 2,655 3,717
Amortized Cost Basis by Origination Year 2024/2023 5,835 3,194
Amortized Cost Basis by Origination Year 2023/2022 3,449 3,665
Amortized Cost Basis by Origination Year 2022/2021 5,305 1,852
Amortized Cost Basis by Origination Year, Prior to 2021/2020 25,555 22,200
Revolving Loans 1,147,061 1,042,133
Revolving Loans Converted to Term 12,552 16,160
Total loans 1,219,341 1,106,652
Home Equity [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025   177
Amortized Cost Basis by Origination Year 2025/2024 475 728
Amortized Cost Basis by Origination Year 2024/2023 776 324
Amortized Cost Basis by Origination Year 2023/2022 857 729
Amortized Cost Basis by Origination Year 2022/2021 1,033 141
Amortized Cost Basis by Origination Year, Prior to 2021/2020 1,511 2,126
Revolving Loans 6,393 5,427
Revolving Loans Converted to Term 279 286
Total loans 11,324 9,938
Home Equity [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025   11
Amortized Cost Basis by Origination Year 2025/2024 63 713
Amortized Cost Basis by Origination Year 2024/2023 613 812
Amortized Cost Basis by Origination Year 2023/2022 753 990
Amortized Cost Basis by Origination Year 2022/2021 462 253
Amortized Cost Basis by Origination Year, Prior to 2021/2020 582 1,171
Revolving Loans 152 110
Revolving Loans Converted to Term 52 102
Total loans 2,677 4,162
Home Equity [Member] | 90 Days or More Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025   55
Amortized Cost Basis by Origination Year 2025/2024 420 1,256
Amortized Cost Basis by Origination Year 2024/2023 964 1,932
Amortized Cost Basis by Origination Year 2023/2022 1,998 1,253
Amortized Cost Basis by Origination Year 2022/2021 662 596
Amortized Cost Basis by Origination Year, Prior to 2021/2020 2,858 2,628
Revolving Loans 9 76
Revolving Loans Converted to Term 558 846
Total loans 7,469 8,642
Home Equity [Member] | Current-period gross charge-offs [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2025/2024 49 79
Amortized Cost Basis by Origination Year 2024/2023 208 562
Amortized Cost Basis by Origination Year 2023/2022 267 322
Amortized Cost Basis by Origination Year 2022/2021 103 137
Amortized Cost Basis by Origination Year, Prior to 2021/2020 557 387
Revolving Loans 18 42
Revolving Loans Converted to Term 63 36
Total loans 1,265 1,565
Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 11,319,515 10,938,834
Commercial Real Estate [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 51,995 26,997
Commercial Real Estate [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 3,805 21,592
Commercial Real Estate [Member] | 90 Days or More Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 62,367 44,771
Residential Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 344,019 302,548
Amortized Cost Basis by Origination Year 2025/2024 241,062 151,887
Amortized Cost Basis by Origination Year 2024/2023 110,133 259,205
Amortized Cost Basis by Origination Year 2023/2022 227,131 735,131
Amortized Cost Basis by Origination Year 2022/2021 686,737 630,951
Amortized Cost Basis by Origination Year, Prior to 2021/2020 1,523,243 1,023,569
Revolving Loans Converted to Term 866,619 835,294
Total loans 3,998,944 3,938,585
Residential Real Estate [Member] | Current [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 344,019 301,928
Amortized Cost Basis by Origination Year 2025/2024 239,659 148,830
Amortized Cost Basis by Origination Year 2024/2023 106,483 252,536
Amortized Cost Basis by Origination Year 2023/2022 217,763 726,653
Amortized Cost Basis by Origination Year 2022/2021 678,609 625,616
Amortized Cost Basis by Origination Year, Prior to 2021/2020 1,498,321 1,002,612
Revolving Loans Converted to Term 861,222 831,319
Total loans 3,946,076 3,889,494
Residential Real Estate [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year, Prior to 2021/2020 397 738
Total loans 397 738
Residential Real Estate [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025   119
Amortized Cost Basis by Origination Year 2025/2024 0 1,152
Amortized Cost Basis by Origination Year 2024/2023 991 1,399
Amortized Cost Basis by Origination Year 2023/2022 2,870 2,362
Amortized Cost Basis by Origination Year 2022/2021 2,395 1,928
Amortized Cost Basis by Origination Year, Prior to 2021/2020 6,768 5,742
Revolving Loans Converted to Term 1,865 811
Total loans 14,889 13,513
Residential Real Estate [Member] | 90 Days or More Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025   501
Amortized Cost Basis by Origination Year 2025/2024 1,403 1,905
Amortized Cost Basis by Origination Year 2024/2023 2,659 5,270
Amortized Cost Basis by Origination Year 2023/2022 6,498 6,116
Amortized Cost Basis by Origination Year 2022/2021 5,733 3,407
Amortized Cost Basis by Origination Year, Prior to 2021/2020 17,757 14,477
Revolving Loans Converted to Term 3,532 3,164
Total loans 37,582 34,840
Residential Real Estate [Member] | Current-period gross charge-offs [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2025/2024 56 62
Amortized Cost Basis by Origination Year 2024/2023 162 173
Amortized Cost Basis by Origination Year 2023/2022 1,002 602
Amortized Cost Basis by Origination Year 2022/2021 232 29
Amortized Cost Basis by Origination Year, Prior to 2021/2020 358 528
Revolving Loans Converted to Term 333 71
Total loans 2,143 1,465
Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 22,773 55,052
Amortized Cost Basis by Origination Year 2025/2024 34,764 76,931
Amortized Cost Basis by Origination Year 2024/2023 55,704 67,747
Amortized Cost Basis by Origination Year 2023/2022 46,448 77,098
Amortized Cost Basis by Origination Year 2022/2021 49,742 25,183
Amortized Cost Basis by Origination Year, Prior to 2021/2020 34,911 25,413
Revolving Loans 28,971 28,269
Revolving Loans Converted to Term 101 33
Total loans 273,414 355,726
Consumer [Member] | Current [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 22,453 54,554
Amortized Cost Basis by Origination Year 2025/2024 34,297 74,906
Amortized Cost Basis by Origination Year 2024/2023 54,585 65,337
Amortized Cost Basis by Origination Year 2023/2022 45,145 74,538
Amortized Cost Basis by Origination Year 2022/2021 48,520 24,333
Amortized Cost Basis by Origination Year, Prior to 2021/2020 34,181 24,369
Revolving Loans 28,933 27,857
Revolving Loans Converted to Term 100 33
Total loans 268,214 345,927
Consumer [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 275 319
Amortized Cost Basis by Origination Year 2025/2024 324 1,234
Amortized Cost Basis by Origination Year 2024/2023 731 1,435
Amortized Cost Basis by Origination Year 2023/2022 771 1,621
Amortized Cost Basis by Origination Year 2022/2021 801 553
Amortized Cost Basis by Origination Year, Prior to 2021/2020 262 545
Revolving Loans 38 412
Revolving Loans Converted to Term 1  
Total loans 3,203 6,119
Consumer [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 11 82
Amortized Cost Basis by Origination Year 2025/2024 113 533
Amortized Cost Basis by Origination Year 2024/2023 252 471
Amortized Cost Basis by Origination Year 2023/2022 356 436
Amortized Cost Basis by Origination Year 2022/2021 364 140
Amortized Cost Basis by Origination Year, Prior to 2021/2020 262 160
Total loans 1,358 1,822
Consumer [Member] | 90 Days or More Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 34 97
Amortized Cost Basis by Origination Year 2025/2024 30 258
Amortized Cost Basis by Origination Year 2024/2023 136 504
Amortized Cost Basis by Origination Year 2023/2022 176 503
Amortized Cost Basis by Origination Year 2022/2021 57 157
Amortized Cost Basis by Origination Year, Prior to 2021/2020 206 339
Total loans 639 1,858
Consumer [Member] | Current-period gross charge-offs [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 43 262
Amortized Cost Basis by Origination Year 2025/2024 557 2,424
Amortized Cost Basis by Origination Year 2024/2023 1,289 1,931
Amortized Cost Basis by Origination Year 2023/2022 1,064 2,168
Amortized Cost Basis by Origination Year 2022/2021 1,661 937
Amortized Cost Basis by Origination Year, Prior to 2021/2020 815 712
Revolving Loans 8  
Revolving Loans Converted to Term 8  
Total loans 5,445 8,434
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 283,546 376,650
Amortized Cost Basis by Origination Year 2025/2024 476,620 427,548
Amortized Cost Basis by Origination Year 2024/2023 248,293 293,448
Amortized Cost Basis by Origination Year 2023/2022 125,910 114,285
Amortized Cost Basis by Origination Year 2022/2021 25,528 56,846
Amortized Cost Basis by Origination Year, Prior to 2021/2020 80,424 75,383
Revolving Loans 133,994 162,549
Revolving Loans Converted to Term 263,007 276,928
Total loans 1,637,322 1,783,637
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 23,125 13,535
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 300 13,956
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | 90 Days or More Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 27,313 832
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 283,546 376,564
Amortized Cost Basis by Origination Year 2025/2024 475,662 427,548
Amortized Cost Basis by Origination Year 2024/2023 228,759 293,344
Amortized Cost Basis by Origination Year 2023/2022 125,715 113,269
Amortized Cost Basis by Origination Year 2022/2021 21,021 56,846
Amortized Cost Basis by Origination Year, Prior to 2021/2020 77,744 73,874
Revolving Loans 130,956 160,549
Revolving Loans Converted to Term 234,855 246,266
Total loans 1,578,258 1,748,260
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | Criticized [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025   86
Amortized Cost Basis by Origination Year 2025/2024 958  
Amortized Cost Basis by Origination Year 2024/2023 19,337 104
Amortized Cost Basis by Origination Year 2023/2022 195 1,016
Amortized Cost Basis by Origination Year 2022/2021 4,507  
Amortized Cost Basis by Origination Year, Prior to 2021/2020 722 1,461
Revolving Loans 3,038 2,000
Revolving Loans Converted to Term 772 3,664
Total loans 29,529 8,331
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | Classified - substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2024/2023 197  
Amortized Cost Basis by Origination Year, Prior to 2021/2020 1,958 48
Revolving Loans Converted to Term 27,380 26,998
Total loans 29,535 27,046
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 1,461,841 1,095,580
Amortized Cost Basis by Origination Year 2025/2024 1,074,018 628,966
Amortized Cost Basis by Origination Year 2024/2023 583,304 591,446
Amortized Cost Basis by Origination Year 2023/2022 460,612 1,567,681
Amortized Cost Basis by Origination Year 2022/2021 1,335,766 893,222
Amortized Cost Basis by Origination Year, Prior to 2021/2020 3,382,295 2,990,297
Revolving Loans 220,090 213,449
Revolving Loans Converted to Term 1,164,267 1,174,556
Total loans 9,682,193 9,155,197
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 28,870 13,462
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 3,505 7,636
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | 90 Days or More Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 35,054 43,939
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 1,461,723 1,095,343
Amortized Cost Basis by Origination Year 2025/2024 1,071,164 552,084
Amortized Cost Basis by Origination Year 2024/2023 569,249 565,203
Amortized Cost Basis by Origination Year 2023/2022 441,421 1,434,869
Amortized Cost Basis by Origination Year 2022/2021 1,219,131 870,120
Amortized Cost Basis by Origination Year, Prior to 2021/2020 3,205,816 2,903,510
Revolving Loans 214,945 213,380
Revolving Loans Converted to Term 1,094,707 1,078,167
Total loans 9,278,156 8,712,676
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | Criticized [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 118  
Amortized Cost Basis by Origination Year 2025/2024 1,847 56,128
Amortized Cost Basis by Origination Year 2024/2023 5,931 19,680
Amortized Cost Basis by Origination Year 2023/2022 5,200 93,507
Amortized Cost Basis by Origination Year 2022/2021 55,551 19,403
Amortized Cost Basis by Origination Year, Prior to 2021/2020 119,125 46,350
Revolving Loans 3,128 69
Revolving Loans Converted to Term 22,918 85,048
Total loans 213,818 320,185
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | Classified - substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025   237
Amortized Cost Basis by Origination Year 2025/2024 1,007 20,754
Amortized Cost Basis by Origination Year 2024/2023 8,124 6,563
Amortized Cost Basis by Origination Year 2023/2022 13,991 39,305
Amortized Cost Basis by Origination Year 2022/2021 61,084 3,699
Amortized Cost Basis by Origination Year, Prior to 2021/2020 57,354 40,437
Revolving Loans 2,017  
Revolving Loans Converted to Term 46,642 11,341
Total loans 190,219 122,336
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | Current-period gross charge-offs [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2024/2023   112
Amortized Cost Basis by Origination Year 2023/2022 31 7
Amortized Cost Basis by Origination Year 2022/2021 227 142
Amortized Cost Basis by Origination Year, Prior to 2021/2020 722 4,221
Revolving Loans Converted to Term   35
Total loans 980 4,517
Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 463,828 441,436
Amortized Cost Basis by Origination Year 2025/2024 320,785 217,539
Amortized Cost Basis by Origination Year 2024/2023 177,408 169,945
Amortized Cost Basis by Origination Year 2023/2022 125,521 311,423
Amortized Cost Basis by Origination Year 2022/2021 254,420 176,693
Amortized Cost Basis by Origination Year, Prior to 2021/2020 361,184 301,883
Revolving Loans 1,117,603 1,032,826
Revolving Loans Converted to Term 247,118 212,148
Total loans 3,067,867 2,863,893
Commercial and Industrial [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 7,325 2,055
Commercial and Industrial [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 3,282 7,434
Commercial and Industrial [Member] | 90 Days or More Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 12,539 16,157
Commercial and Industrial [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 461,350 441,249
Amortized Cost Basis by Origination Year 2025/2024 312,252 209,251
Amortized Cost Basis by Origination Year 2024/2023 137,878 161,292
Amortized Cost Basis by Origination Year 2023/2022 119,225 284,974
Amortized Cost Basis by Origination Year 2022/2021 240,499 167,107
Amortized Cost Basis by Origination Year, Prior to 2021/2020 344,721 285,489
Revolving Loans 1,043,473 988,436
Revolving Loans Converted to Term 236,485 199,065
Total loans 2,895,883 2,736,863
Commercial and Industrial [Member] | Criticized [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 2,478 160
Amortized Cost Basis by Origination Year 2025/2024 8,345 5,211
Amortized Cost Basis by Origination Year 2024/2023 4,946 3,453
Amortized Cost Basis by Origination Year 2023/2022 709 20,461
Amortized Cost Basis by Origination Year 2022/2021 3,606 5,770
Amortized Cost Basis by Origination Year, Prior to 2021/2020 1,842 7,984
Revolving Loans 57,800 37,689
Revolving Loans Converted to Term 7,360 3,824
Total loans 87,086 84,552
Commercial and Industrial [Member] | Classified - substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025   27
Amortized Cost Basis by Origination Year 2025/2024 188 3,077
Amortized Cost Basis by Origination Year 2024/2023 34,584 5,200
Amortized Cost Basis by Origination Year 2023/2022 5,587 5,988
Amortized Cost Basis by Origination Year 2022/2021 10,315 3,816
Amortized Cost Basis by Origination Year, Prior to 2021/2020 14,621 8,410
Revolving Loans 16,330 6,701
Revolving Loans Converted to Term 3,273 9,259
Total loans 84,898 42,478
Commercial and Industrial [Member] | Current-period gross charge-offs [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2025/2024 157 1,453
Amortized Cost Basis by Origination Year 2024/2023 3,183 739
Amortized Cost Basis by Origination Year 2023/2022 1,016 1,138
Amortized Cost Basis by Origination Year 2022/2021 1,442 553
Amortized Cost Basis by Origination Year, Prior to 2021/2020 1,619 959
Revolving Loans 679 1,088
Revolving Loans Converted to Term 7,133 1,318
Total loans $ 15,229 $ 7,248