v3.26.1
Loans and Allowance for Credit Losses - Schedule of Risk Category of Loans by Class of Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Commercial Real Estate [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 $ 255,242 $ 433,998
Year 2 536,245 321,671
Year 3 316,003 164,191
Year 4 126,351 260,729
Year 5 323,726 163,885
Prior 432,665 261,721
Revolving Loans Amortized Cost 977,307 619,154
Revolving Loans Converted to Term 742 999
Total 2,968,281 2,226,348
Commercial Real Estate [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 254,078 429,259
Year 2 528,691 319,227
Year 3 312,077 162,815
Year 4 124,823 256,817
Year 5 320,646 162,737
Prior 426,118 258,510
Revolving Loans Amortized Cost 971,281 614,449
Revolving Loans Converted to Term 742 999
Total 2,938,456 2,204,813
Commercial Real Estate [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 2   115
Year 3 113  
Year 4   73
Revolving Loans Amortized Cost   667
Total 113 855
Commercial Real Estate [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 1,164 4,739
Year 2 7,554 2,329
Year 3 3,813 1,376
Year 4 1,528 3,839
Year 5 3,080 1,148
Prior 6,547 3,211
Revolving Loans Amortized Cost 6,026 4,038
Total 29,712 20,680
Commercial and Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 87,088 193,223
Year 2 179,970 137,203
Year 3 121,391 68,191
Year 4 58,519 49,555
Year 5 42,747 34,029
Prior 47,711 27,461
Revolving Loans Amortized Cost 417,006 306,374
Revolving Loans Converted to Term 948 849
Total 955,380 816,885
Commercial and Industrial [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 87,085 192,904
Year 2 177,514 120,288
Year 3 107,652 43,779
Year 4 35,805 48,264
Year 5 41,370 33,804
Prior 45,798 25,293
Revolving Loans Amortized Cost 408,826 304,608
Revolving Loans Converted to Term 948 849
Total 904,998 769,789
Commercial and Industrial [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 2   93
Year 3   16,865
Year 4 5,700 147
Year 5 131 10
Prior 192 336
Revolving Loans Amortized Cost 98 129
Total 6,121 17,580
Commercial and Industrial [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 3 319
Year 2 2,456 16,822
Year 3 13,739 7,547
Year 4 17,014 1,144
Year 5 1,246 215
Prior 1,721 1,832
Revolving Loans Amortized Cost 8,082 1,637
Total 44,261 29,516
Residential Real Estate [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 45,102 49,106
Year 2 69,074 17,695
Year 3 21,210 31,938
Year 4 40,864 37,071
Year 5 54,524 242,795
Prior 359,078 124,453
Revolving Loans Amortized Cost 119,842 78,663
Revolving Loans Converted to Term 1,254 424
Total 710,948 582,145
Residential Real Estate [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 45,102 49,089
Year 2 69,058 17,591
Year 3 21,115 30,673
Year 4 37,990 36,518
Year 5 54,060 242,578
Prior 356,759 121,963
Revolving Loans Amortized Cost 119,077 78,442
Revolving Loans Converted to Term 1,211 379
Total 704,372 577,233
Residential Real Estate [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Prior 265 277
Total 265 277
Residential Real Estate [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1   17
Year 2 16 104
Year 3 95 1,265
Year 4 2,874 553
Year 5 464 217
Prior 2,054 2,213
Revolving Loans Amortized Cost 765 221
Revolving Loans Converted to Term 43 45
Total 6,311 4,635
Agricultural Real Estate [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 42,812 65,295
Year 2 89,139 43,928
Year 3 40,228 21,682
Year 4 23,346 16,193
Year 5 25,714 10,677
Prior 95,617 50,769
Revolving Loans Amortized Cost 102,660 70,113
Revolving Loans Converted to Term 314 270
Total 419,830 278,927
Agricultural Real Estate [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 42,804 65,295
Year 2 89,139 43,928
Year 3 37,835 19,536
Year 4 21,419 16,115
Year 5 25,714 10,270
Prior 94,215 49,537
Revolving Loans Amortized Cost 102,397 70,113
Revolving Loans Converted to Term 314 270
Total 413,837 275,064
Agricultural Real Estate [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 8  
Prior 124 129
Total 132 129
Agricultural Real Estate [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 2 (0)  
Year 3 2,393 2,146
Year 4 1,927 78
Year 5   407
Prior 1,278 1,103
Revolving Loans Amortized Cost 263  
Total 5,861 3,734
Agricultural [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 26,332 27,508
Year 2 29,307 20,885
Year 3 17,751 5,030
Year 4 3,569 1,779
Year 5 1,952 1,523
Prior 6,210 3,313
Revolving Loans Amortized Cost 162,069 128,213
Revolving Loans Converted to Term 137 224
Total 247,327 188,475
Agricultural [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 26,312 27,452
Year 2 28,721 20,798
Year 3 17,712 4,886
Year 4 3,443 1,649
Year 5 1,923 1,506
Prior 5,799 2,618
Revolving Loans Amortized Cost 161,411 127,847
Revolving Loans Converted to Term 137 224
Total 245,458 186,980
Agricultural [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 3 0 1
Prior 62 32
Total 62 33
Agricultural [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 20 56
Year 2 586 87
Year 3 39 143
Year 4 126 130
Year 5 29 17
Prior 349 663
Revolving Loans Amortized Cost 658 366
Total 1,807 1,462
Consumer [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 36,103 37,847
Year 2 12,505 8,950
Year 3 7,537 10,149
Year 4 8,397 7,436
Year 5 4,834 3,445
Prior 6,098 3,529
Revolving Loans Amortized Cost 28,478 34,044
Total 103,952 105,400
Consumer [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 36,079 37,830
Year 2 12,452 8,889
Year 3 7,443 9,933
Year 4 8,206 7,213
Year 5 4,684 3,326
Prior 5,900 3,485
Revolving Loans Amortized Cost 28,478 34,044
Total 103,242 104,720
Consumer [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 24 17
Year 2 53 61
Year 3 94 216
Year 4 191 223
Year 5 150 119
Prior 198 44
Total 710 680
Total Loans Portfolio Segment [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 492,679 806,977
Year 2 916,240 550,332
Year 3 524,120 301,181
Year 4 261,046 372,763
Year 5 453,497 456,354
Prior 947,379 471,246
Revolving Loans Amortized Cost 1,807,362 1,236,561
Revolving Loans Converted to Term 3,395 2,766
Total 5,405,718 4,198,180
Total Loans Portfolio Segment [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 491,460 801,829
Year 2 905,575 530,721
Year 3 503,834 271,622
Year 4 231,686 366,576
Year 5 448,397 454,221
Prior 934,589 461,406
Revolving Loans Amortized Cost 1,791,470 1,229,503
Revolving Loans Converted to Term 3,352 2,721
Total 5,310,363 4,118,599
Total Loans Portfolio Segment [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 8  
Year 2   208
Year 3 113 16,866
Year 4 5,700 220
Year 5 131 10
Prior 643 774
Revolving Loans Amortized Cost 98 796
Total 6,693 18,874
Total Loans Portfolio Segment [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Year 1 1,211 5,148
Year 2 10,665 19,403
Year 3 20,173 12,693
Year 4 23,660 5,967
Year 5 4,969 2,123
Prior 12,147 9,066
Revolving Loans Amortized Cost 15,794 6,262
Revolving Loans Converted to Term 43 45
Total $ 88,662 $ 60,707