v3.26.1
Loans and Allowance for Credit Losses - Schedule of Risk Category of Loans by Class of Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Commercial Real Estate [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 $ 113,543 $ 433,998
Year 2 576,727 321,671
Year 3 341,365 164,191
Year 4 159,661 260,729
Year 5 335,735 163,885
Prior 486,666 261,721
Revolving Loans Amortized Cost 943,090 619,154
Revolving Loans Converted to Term 1,476 999
Total 2,958,263 2,226,348
Commercial Real Estate [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 113,543 429,259
Year 2 570,533 319,227
Year 3 337,946 162,815
Year 4 157,900 256,817
Year 5 332,386 162,737
Prior 478,864 258,510
Revolving Loans Amortized Cost 937,356 614,449
Revolving Loans Converted to Term 1,476 999
Total 2,930,004 2,204,813
Commercial Real Estate [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 2   115
Year 3 114  
Year 4   73
Year 5 69  
Revolving Loans Amortized Cost 666 667
Total 849 855
Commercial Real Estate [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1   4,739
Year 2 6,194 2,329
Year 3 3,305 1,376
Year 4 1,761 3,839
Year 5 3,280 1,148
Prior 7,802 3,211
Revolving Loans Amortized Cost 5,068 4,038
Total 27,410 20,680
Commercial and Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 29,270 193,223
Year 2 201,163 137,203
Year 3 139,698 68,191
Year 4 69,076 49,555
Year 5 48,521 34,029
Prior 53,340 27,461
Revolving Loans Amortized Cost 425,201 306,374
Revolving Loans Converted to Term 780 849
Total 967,049 816,885
Commercial and Industrial [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 29,270 192,904
Year 2 199,117 120,288
Year 3 125,784 43,779
Year 4 45,346 48,264
Year 5 46,821 33,804
Prior 50,703 25,293
Revolving Loans Amortized Cost 417,535 304,608
Revolving Loans Converted to Term 780 849
Total 915,356 769,789
Commercial and Industrial [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 2   93
Year 3 89 16,865
Year 4 16,233 147
Year 5 146 10
Prior 202 336
Revolving Loans Amortized Cost 130 129
Total 16,800 17,580
Commercial and Industrial [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1   319
Year 2 2,046 16,822
Year 3 13,825 7,547
Year 4 7,497 1,144
Year 5 1,554 215
Prior 2,435 1,832
Revolving Loans Amortized Cost 7,536 1,637
Total 34,893 29,516
Residential Real Estate [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 27,679 49,106
Year 2 74,276 17,695
Year 3 22,396 31,938
Year 4 43,827 37,071
Year 5 58,899 242,795
Prior 374,331 124,453
Revolving Loans Amortized Cost 118,629 78,663
Revolving Loans Converted to Term 404 424
Total 720,441 582,145
Residential Real Estate [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 27,679 49,089
Year 2 74,260 17,591
Year 3 22,300 30,673
Year 4 43,002 36,518
Year 5 58,581 242,578
Prior 372,054 121,963
Revolving Loans Amortized Cost 118,109 78,442
Revolving Loans Converted to Term 359 379
Total 716,344 577,233
Residential Real Estate [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Prior 271 277
Total 271 277
Residential Real Estate [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1   17
Year 2 16 104
Year 3 96 1,265
Year 4 825 553
Year 5 318 217
Prior 2,006 2,213
Revolving Loans Amortized Cost 520 221
Revolving Loans Converted to Term 45 45
Total 3,826 4,635
Agricultural Real Estate [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 18,831 65,295
Year 2 98,744 43,928
Year 3 52,507 21,682
Year 4 26,007 16,193
Year 5 26,808 10,677
Prior 107,727 50,769
Revolving Loans Amortized Cost 100,421 70,113
Revolving Loans Converted to Term 263 270
Total 431,308 278,927
Agricultural Real Estate [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 18,823 65,295
Year 2 98,744 43,928
Year 3 50,114 19,536
Year 4 23,764 16,115
Year 5 26,655 10,270
Prior 106,360 49,537
Revolving Loans Amortized Cost 100,136 70,113
Revolving Loans Converted to Term 263 270
Total 424,859 275,064
Agricultural Real Estate [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 8  
Prior 126 129
Total 134 129
Agricultural Real Estate [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 3 2,393 2,146
Year 4 2,243 78
Year 5 153 407
Prior 1,241 1,103
Revolving Loans Amortized Cost 285  
Total 6,315 3,734
Agricultural [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 9,857 27,508
Year 2 33,121 20,885
Year 3 19,957 5,030
Year 4 5,373 1,779
Year 5 2,353 1,523
Prior 7,105 3,313
Revolving Loans Amortized Cost 171,150 128,213
Revolving Loans Converted to Term 137 224
Total 249,053 188,475
Agricultural [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 9,857 27,452
Year 2 32,529 20,798
Year 3 19,903 4,886
Year 4 4,722 1,649
Year 5 2,324 1,506
Prior 6,413 2,618
Revolving Loans Amortized Cost 170,582 127,847
Revolving Loans Converted to Term 137 224
Total 246,467 186,980
Agricultural [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 3   1
Prior 62 32
Total 62 33
Agricultural [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1   56
Year 2 592 87
Year 3 54 143
Year 4 651 130
Year 5 29 17
Prior 630 663
Revolving Loans Amortized Cost 568 366
Total 2,524 1,462
Consumer [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 28,456 37,847
Year 2 15,020 8,950
Year 3 8,865 10,149
Year 4 9,864 7,436
Year 5 6,307 3,445
Prior 6,898 3,529
Revolving Loans Amortized Cost 26,751 34,044
Total 102,161 105,400
Consumer [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 28,456 37,830
Year 2 14,929 8,889
Year 3 8,762 9,933
Year 4 9,676 7,213
Year 5 6,111 3,326
Prior 6,739 3,485
Revolving Loans Amortized Cost 26,751 34,044
Total 101,424 104,720
Consumer [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1   17
Year 2 91 61
Year 3 103 216
Year 4 188 223
Year 5 196 119
Prior 159 44
Total 737 680
Total Loans Portfolio Segment [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 227,636 806,977
Year 2 999,051 550,332
Year 3 584,788 301,181
Year 4 313,808 372,763
Year 5 478,623 456,354
Prior 1,036,067 471,246
Revolving Loans Amortized Cost 1,785,242 1,236,561
Revolving Loans Converted to Term 3,060 2,766
Total 5,428,275 4,198,180
Total Loans Portfolio Segment [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 227,628 801,829
Year 2 990,112 530,721
Year 3 564,809 271,622
Year 4 284,410 366,576
Year 5 472,878 454,221
Prior 1,021,133 461,406
Revolving Loans Amortized Cost 1,770,469 1,229,503
Revolving Loans Converted to Term 3,015 2,721
Total 5,334,454 4,118,599
Total Loans Portfolio Segment [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 8  
Year 2   208
Year 3 203 16,866
Year 4 16,233 220
Year 5 215 10
Prior 661 774
Revolving Loans Amortized Cost 796 796
Total 18,116 18,874
Total Loans Portfolio Segment [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1   5,148
Year 2 8,939 19,403
Year 3 19,776 12,693
Year 4 13,165 5,967
Year 5 5,530 2,123
Prior 14,273 9,066
Revolving Loans Amortized Cost 13,977 6,262
Revolving Loans Converted to Term 45 45
Total $ 75,705 $ 60,707