v3.26.1
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
Jun. 30, 2026
Dec. 31, 2025
Financing Receivable, Recorded Investment [Line Items]    
Total loans $ 19,478,966 $ 19,226,432
30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 39,647 45,847
60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 30,775 48,523
90 Days or More Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 143,011 106,268
Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 13,323 13,974
Amortized Cost Basis by Origination Year 2025/2024 2,179 6,414
Amortized Cost Basis by Origination Year 2024/2023 7,114 6,262
Amortized Cost Basis by Origination Year 2023/2022 6,471 6,637
Amortized Cost Basis by Origination Year 2022/2021 6,284 2,842
Amortized Cost Basis by Origination Year, Prior to 2021/2020 30,883 28,125
Revolving Loans 1,110,161 1,047,746
Revolving Loans Converted to Term 15,394 17,394
Total loans 1,191,809 1,129,394
Home Equity [Member] | Current [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 13,323 13,731
Amortized Cost Basis by Origination Year 2025/2024 1,227 3,717
Amortized Cost Basis by Origination Year 2024/2023 4,974 3,194
Amortized Cost Basis by Origination Year 2023/2022 3,387 3,665
Amortized Cost Basis by Origination Year 2022/2021 4,518 1,852
Amortized Cost Basis by Origination Year, Prior to 2021/2020 25,560 22,200
Revolving Loans 1,105,970 1,042,133
Revolving Loans Converted to Term 14,176 16,160
Total loans 1,173,135 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 359 728
Amortized Cost Basis by Origination Year 2024/2023 385 324
Amortized Cost Basis by Origination Year 2023/2022 673 729
Amortized Cost Basis by Origination Year 2022/2021 626 141
Amortized Cost Basis by Origination Year, Prior to 2021/2020 1,064 2,126
Revolving Loans 4,117 5,427
Revolving Loans Converted to Term 364 286
Total loans 7,588 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 276 713
Amortized Cost Basis by Origination Year 2024/2023 686 812
Amortized Cost Basis by Origination Year 2023/2022 433 990
Amortized Cost Basis by Origination Year 2022/2021 469 253
Amortized Cost Basis by Origination Year, Prior to 2021/2020 906 1,171
Revolving Loans   110
Revolving Loans Converted to Term 127 102
Total loans 2,897 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 317 1,256
Amortized Cost Basis by Origination Year 2024/2023 1,069 1,932
Amortized Cost Basis by Origination Year 2023/2022 1,978 1,253
Amortized Cost Basis by Origination Year 2022/2021 671 596
Amortized Cost Basis by Origination Year, Prior to 2021/2020 3,353 2,628
Revolving Loans 74 76
Revolving Loans Converted to Term 727 846
Total loans 8,189 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 30 79
Amortized Cost Basis by Origination Year 2024/2023 166 562
Amortized Cost Basis by Origination Year 2023/2022 239 322
Amortized Cost Basis by Origination Year 2022/2021 78 137
Amortized Cost Basis by Origination Year, Prior to 2021/2020 197 387
Revolving Loans 3 42
Revolving Loans Converted to Term 43 36
Total loans 756 1,565
Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 11,093,370 10,938,834
Commercial Real Estate [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 24,780 26,997
Commercial Real Estate [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 7,996 21,592
Commercial Real Estate [Member] | 90 Days or More Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 79,432 44,771
Residential Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 195,801 302,548
Amortized Cost Basis by Origination Year 2025/2024 269,699 151,887
Amortized Cost Basis by Origination Year 2024/2023 117,467 259,205
Amortized Cost Basis by Origination Year 2023/2022 237,217 735,131
Amortized Cost Basis by Origination Year 2022/2021 700,130 630,951
Amortized Cost Basis by Origination Year, Prior to 2021/2020 1,565,616 1,023,569
Revolving Loans Converted to Term 853,883 835,294
Total loans 3,939,813 3,938,585
Residential Real Estate [Member] | Current [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 195,801 301,928
Amortized Cost Basis by Origination Year 2025/2024 268,102 148,830
Amortized Cost Basis by Origination Year 2024/2023 114,339 252,536
Amortized Cost Basis by Origination Year 2023/2022 229,837 726,653
Amortized Cost Basis by Origination Year 2022/2021 692,656 625,616
Amortized Cost Basis by Origination Year, Prior to 2021/2020 1,541,441 1,002,612
Revolving Loans Converted to Term 847,057 831,319
Total loans 3,889,233 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 956 738
Total loans 956 738
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 210 1,152
Amortized Cost Basis by Origination Year 2024/2023 539 1,399
Amortized Cost Basis by Origination Year 2023/2022 1,897 2,362
Amortized Cost Basis by Origination Year 2022/2021 1,651 1,928
Amortized Cost Basis by Origination Year, Prior to 2021/2020 9,129 5,742
Revolving Loans Converted to Term 1,524 811
Total loans 14,950 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 1,387 1,905
Amortized Cost Basis by Origination Year 2024/2023 2,589 5,270
Amortized Cost Basis by Origination Year 2023/2022 5,483 6,116
Amortized Cost Basis by Origination Year 2022/2021 5,823 3,407
Amortized Cost Basis by Origination Year, Prior to 2021/2020 14,090 14,477
Revolving Loans Converted to Term 5,302 3,164
Total loans 34,674 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 120 173
Amortized Cost Basis by Origination Year 2023/2022 564 602
Amortized Cost Basis by Origination Year 2022/2021 232 29
Amortized Cost Basis by Origination Year, Prior to 2021/2020 137 528
Revolving Loans Converted to Term 199 71
Total loans 1,308 1,465
Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 22,841 55,052
Amortized Cost Basis by Origination Year 2025/2024 39,832 76,931
Amortized Cost Basis by Origination Year 2024/2023 62,276 67,747
Amortized Cost Basis by Origination Year 2023/2022 53,124 77,098
Amortized Cost Basis by Origination Year 2022/2021 57,977 25,183
Amortized Cost Basis by Origination Year, Prior to 2021/2020 39,100 25,413
Revolving Loans 28,937 28,269
Revolving Loans Converted to Term 24 33
Total loans 304,111 355,726
Consumer [Member] | Current [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 22,805 54,554
Amortized Cost Basis by Origination Year 2025/2024 38,776 74,906
Amortized Cost Basis by Origination Year 2024/2023 60,931 65,337
Amortized Cost Basis by Origination Year 2023/2022 51,842 74,538
Amortized Cost Basis by Origination Year 2022/2021 56,619 24,333
Amortized Cost Basis by Origination Year, Prior to 2021/2020 38,340 24,369
Revolving Loans 28,903 27,857
Revolving Loans Converted to Term 24 33
Total loans 298,240 345,927
Consumer [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 18 319
Amortized Cost Basis by Origination Year 2025/2024 784 1,234
Amortized Cost Basis by Origination Year 2024/2023 1,043 1,435
Amortized Cost Basis by Origination Year 2023/2022 901 1,621
Amortized Cost Basis by Origination Year 2022/2021 808 553
Amortized Cost Basis by Origination Year, Prior to 2021/2020 379 545
Revolving Loans 34 412
Total loans 3,967 6,119
Consumer [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 14 82
Amortized Cost Basis by Origination Year 2025/2024 126 533
Amortized Cost Basis by Origination Year 2024/2023 225 471
Amortized Cost Basis by Origination Year 2023/2022 295 436
Amortized Cost Basis by Origination Year 2022/2021 548 140
Amortized Cost Basis by Origination Year, Prior to 2021/2020 214 160
Total loans 1,422 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 4 97
Amortized Cost Basis by Origination Year 2025/2024 146 258
Amortized Cost Basis by Origination Year 2024/2023 77 504
Amortized Cost Basis by Origination Year 2023/2022 86 503
Amortized Cost Basis by Origination Year 2022/2021 2 157
Amortized Cost Basis by Origination Year, Prior to 2021/2020 167 339
Total loans 482 1,858
Consumer [Member] | Current-period gross charge-offs [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 6 262
Amortized Cost Basis by Origination Year 2025/2024 389 2,424
Amortized Cost Basis by Origination Year 2024/2023 1,145 1,931
Amortized Cost Basis by Origination Year 2023/2022 861 2,168
Amortized Cost Basis by Origination Year 2022/2021 1,203 937
Amortized Cost Basis by Origination Year, Prior to 2021/2020 711 712
Revolving Loans 7  
Revolving Loans Converted to Term 8  
Total loans 4,330 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 105,742 376,650
Amortized Cost Basis by Origination Year 2025/2024 465,284 427,548
Amortized Cost Basis by Origination Year 2024/2023 283,188 293,448
Amortized Cost Basis by Origination Year 2023/2022 142,936 114,285
Amortized Cost Basis by Origination Year 2022/2021 30,835 56,846
Amortized Cost Basis by Origination Year, Prior to 2021/2020 91,274 75,383
Revolving Loans 103,159 162,549
Revolving Loans Converted to Term 283,074 276,928
Total loans 1,505,492 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 1,184 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 497 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 28,145 832
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 105,742 376,564
Amortized Cost Basis by Origination Year 2025/2024 465,284 427,548
Amortized Cost Basis by Origination Year 2024/2023 264,255 293,344
Amortized Cost Basis by Origination Year 2023/2022 142,737 113,269
Amortized Cost Basis by Origination Year 2022/2021 30,404 56,846
Amortized Cost Basis by Origination Year, Prior to 2021/2020 89,238 73,874
Revolving Loans 101,161 160,549
Revolving Loans Converted to Term 254,053 246,266
Total loans 1,452,874 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 2024/2023 18,736 104
Amortized Cost Basis by Origination Year 2023/2022 199 1,016
Amortized Cost Basis by Origination Year 2022/2021 431  
Amortized Cost Basis by Origination Year, Prior to 2021/2020 81 1,461
Revolving Loans 1,998 2,000
Revolving Loans Converted to Term 953 3,664
Total loans 22,398 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 1,955 48
Revolving Loans Converted to Term 28,068 26,998
Total loans 30,220 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 930,802 1,095,580
Amortized Cost Basis by Origination Year 2025/2024 1,090,504 628,966
Amortized Cost Basis by Origination Year 2024/2023 644,445 591,446
Amortized Cost Basis by Origination Year 2023/2022 482,146 1,567,681
Amortized Cost Basis by Origination Year 2022/2021 1,499,257 893,222
Amortized Cost Basis by Origination Year, Prior to 2021/2020 3,509,362 2,990,297
Revolving Loans 220,740 213,449
Revolving Loans Converted to Term 1,210,622 1,174,556
Total loans 9,587,878 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 23,596 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 7,499 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 51,287 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 930,683 1,095,343
Amortized Cost Basis by Origination Year 2025/2024 1,084,845 552,084
Amortized Cost Basis by Origination Year 2024/2023 612,415 565,203
Amortized Cost Basis by Origination Year 2023/2022 445,718 1,434,869
Amortized Cost Basis by Origination Year 2022/2021 1,354,285 870,120
Amortized Cost Basis by Origination Year, Prior to 2021/2020 3,362,282 2,903,510
Revolving Loans 214,938 213,380
Revolving Loans Converted to Term 1,123,197 1,078,167
Total loans 9,128,363 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 119  
Amortized Cost Basis by Origination Year 2025/2024 1,657 56,128
Amortized Cost Basis by Origination Year 2024/2023 23,869 19,680
Amortized Cost Basis by Origination Year 2023/2022 23,268 93,507
Amortized Cost Basis by Origination Year 2022/2021 62,331 19,403
Amortized Cost Basis by Origination Year, Prior to 2021/2020 83,927 46,350
Revolving Loans 5,783 69
Revolving Loans Converted to Term 65,091 85,048
Total loans 266,045 320,185
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 4,002 20,754
Amortized Cost Basis by Origination Year 2024/2023 8,161 6,563
Amortized Cost Basis by Origination Year 2023/2022 13,160 39,305
Amortized Cost Basis by Origination Year 2022/2021 82,641 3,699
Amortized Cost Basis by Origination Year, Prior to 2021/2020 63,153 40,437
Revolving Loans 19  
Revolving Loans Converted to Term 22,334 11,341
Total loans 193,470 122,336
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 719 4,221
Revolving Loans Converted to Term   35
Total loans 977 4,517
Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 264,473 441,436
Amortized Cost Basis by Origination Year 2025/2024 339,363 217,539
Amortized Cost Basis by Origination Year 2024/2023 188,972 169,945
Amortized Cost Basis by Origination Year 2023/2022 142,380 311,423
Amortized Cost Basis by Origination Year 2022/2021 274,374 176,693
Amortized Cost Basis by Origination Year, Prior to 2021/2020 406,828 301,883
Revolving Loans 1,075,477 1,032,826
Revolving Loans Converted to Term 257,996 212,148
Total loans 2,949,863 2,863,893
Commercial and Industrial [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 2,356 2,055
Commercial and Industrial [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 3,510 7,434
Commercial and Industrial [Member] | 90 Days or More Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 20,234 16,157
Commercial and Industrial [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 263,215 441,249
Amortized Cost Basis by Origination Year 2025/2024 337,660 209,251
Amortized Cost Basis by Origination Year 2024/2023 152,308 161,292
Amortized Cost Basis by Origination Year 2023/2022 135,620 284,974
Amortized Cost Basis by Origination Year 2022/2021 252,708 167,107
Amortized Cost Basis by Origination Year, Prior to 2021/2020 386,853 285,489
Revolving Loans 970,691 988,436
Revolving Loans Converted to Term 235,040 199,065
Total loans 2,734,095 2,736,863
Commercial and Industrial [Member] | Criticized [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Amortized Cost Basis by Origination Year 2026/2025 1,258 160
Amortized Cost Basis by Origination Year 2025/2024 1,444 5,211
Amortized Cost Basis by Origination Year 2024/2023 8,755 3,453
Amortized Cost Basis by Origination Year 2023/2022 419 20,461
Amortized Cost Basis by Origination Year 2022/2021 13,488 5,770
Amortized Cost Basis by Origination Year, Prior to 2021/2020 6,326 7,984
Revolving Loans 98,409 37,689
Revolving Loans Converted to Term 12,692 3,824
Total loans 142,791 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 259 3,077
Amortized Cost Basis by Origination Year 2024/2023 27,909 5,200
Amortized Cost Basis by Origination Year 2023/2022 6,341 5,988
Amortized Cost Basis by Origination Year 2022/2021 8,178 3,816
Amortized Cost Basis by Origination Year, Prior to 2021/2020 13,649 8,410
Revolving Loans 6,377 6,701
Revolving Loans Converted to Term 10,264 9,259
Total loans 72,977 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   1,453
Amortized Cost Basis by Origination Year 2024/2023 1,892 739
Amortized Cost Basis by Origination Year 2023/2022 909 1,138
Amortized Cost Basis by Origination Year 2022/2021 1,416 553
Amortized Cost Basis by Origination Year, Prior to 2021/2020 1,421 959
Revolving Loans 8 1,088
Revolving Loans Converted to Term 326 1,318
Total loans $ 5,972 $ 7,248