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Loans and Allowance for Credit Losses - Schedule of Risk Category of Loans by Class of Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Commercial Real Estate [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 $ 175,524 $ 432,196
2022 384,558 255,787
2021 246,792 189,141
2020 169,161 92,434
2019 70,234 114,415
Prior 208,512 174,414
Revolving Loans Amortized Cost 466,110 462,140
Revolving Loans Converted to Term 870 741
Total 1,721,761 1,721,268
Commercial Real Estate [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 175,524 432,196
2022 382,092 252,616
2021 243,586 188,897
2020 168,924 92,290
2019 68,734 114,415
Prior 205,595 171,498
Revolving Loans Amortized Cost 465,774 462,140
Revolving Loans Converted to Term 870 741
Total 1,711,099 1,714,793
Commercial Real Estate [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
2022 2,037 122
2021 120  
Prior 398 401
Revolving Loans Amortized Cost 257  
Total 2,812 523
Commercial Real Estate [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
2022 429 3,049
2021 3,086 244
2020 237 144
2019 1,500  
Prior 2,519 2,515
Revolving Loans Amortized Cost 79  
Total 7,850 5,952
Commercial and Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 112,730 173,195
2022 122,869 84,098
2021 58,091 68,082
2020 55,555 49,614
2019 31,813 8,846
Prior 11,525 9,723
Revolving Loans Amortized Cost 190,687 194,651
Revolving Loans Converted to Term 1,859 6,654
Total 585,129 594,863
Commercial and Industrial [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 111,420 172,912
2022 122,245 79,782
2021 57,766 65,915
2020 53,275 39,487
2019 31,559 6,712
Prior 8,335 5,089
Revolving Loans Amortized Cost 185,545 189,998
Revolving Loans Converted to Term 1,859 6,654
Total 572,004 566,549
Commercial and Industrial [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
2021 15  
2019   674
Prior 998 3,851
Revolving Loans Amortized Cost 2,251  
Total 3,264 4,525
Commercial and Industrial [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 1,310 283
2022 624 4,316
2021 310 2,167
2020 2,280 10,127
2019 254 1,460
Prior 2,192 783
Revolving Loans Amortized Cost 2,891 4,653
Total 9,861 23,789
Residential Real Estate [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 25,540 34,763
2022 30,538 299,926
2021 284,782 5,987
2020 5,576 13,282
2019 12,860 48,225
Prior 137,177 105,504
Revolving Loans Amortized Cost 60,504 62,592
Revolving Loans Converted to Term 1,211 271
Total 558,188 570,550
Residential Real Estate [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 25,540 34,705
2022 30,415 299,840
2021 284,667 5,939
2020 5,554 13,073
2019 12,662 47,986
Prior 135,185 102,871
Revolving Loans Amortized Cost 59,834 62,494
Revolving Loans Converted to Term 1,141 271
Total 554,998 567,179
Residential Real Estate [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023   58
2022 123 86
2021 115 48
2020 22 209
2019 198 239
Prior 1,992 2,633
Revolving Loans Amortized Cost 670 98
Revolving Loans Converted to Term 70  
Total 3,190 3,371
Agricultural Real Estate [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 23,030 34,460
2022 28,039 20,915
2021 18,655 28,901
2020 19,285 12,869
2019 10,947 6,093
Prior 24,660 21,121
Revolving Loans Amortized Cost 80,960 74,530
Revolving Loans Converted to Term 289 300
Total 205,865 199,189
Agricultural Real Estate [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 22,127 33,586
2022 27,644 20,712
2021 18,627 26,408
2020 19,285 12,754
2019 10,845 5,608
Prior 20,968 18,882
Revolving Loans Amortized Cost 80,167 68,510
Revolving Loans Converted to Term 289 300
Total 199,952 186,760
Agricultural Real Estate [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 903 874
2022 395  
2021   2,493
Prior 168 604
Revolving Loans Amortized Cost 755 5,983
Total 2,221 9,954
Agricultural Real Estate [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
2022   203
2021 28  
2020   115
2019 102 485
Prior 3,524 1,635
Revolving Loans Amortized Cost 38 37
Total 3,692 2,475
Agricultural [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 10,924 23,917
2022 8,182 8,781
2021 6,156 11,275
2020 8,784 4,778
2019 3,483 2,658
Prior 4,324 2,722
Revolving Loans Amortized Cost 61,444 65,797
Revolving Loans Converted to Term 55 75
Total 103,352 120,003
Agricultural [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 10,865 23,917
2022 8,113 7,778
2021 5,653 9,437
2020 8,144 2,642
2019 1,621 2,250
Prior 4,228 2,134
Revolving Loans Amortized Cost 60,921 64,647
Revolving Loans Converted to Term 55 75
Total 99,600 112,880
Agricultural [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
2020   92
2019   22
Prior 33 375
Revolving Loans Amortized Cost 259 556
Total 292 1,045
Agricultural [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 59  
2022 69 1,003
2021 503 1,838
2020 640 2,044
2019 1,862 386
Prior 63 213
Revolving Loans Amortized Cost 264 594
Total 3,460 6,078
Consumer [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 45,360 56,514
2022 27,835 17,608
2021 12,020 8,469
2020 5,647 3,316
2019 1,676 1,383
Prior 3,237 3,430
Revolving Loans Amortized Cost 12,047 14,955
Revolving Loans Converted to Term 1  
Total 107,823 105,675
Consumer [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 45,341 56,497
2022 27,568 17,460
2021 11,826 8,415
2020 5,555 3,235
2019 1,619 1,370
Prior 3,211 3,396
Revolving Loans Amortized Cost 12,046 14,955
Revolving Loans Converted to Term 1  
Total 107,167 105,328
Consumer [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 19 17
2022 267 148
2021 194 54
2020 92 81
2019 57 13
Prior 26 34
Revolving Loans Amortized Cost 1  
Total 656 347
Total Loans Portfolio Segment [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 393,108 755,045
2022 602,021 687,115
2021 626,496 311,855
2020 264,008 176,293
2019 131,013 181,620
Prior 389,435 316,914
Revolving Loans Amortized Cost 871,752 874,665
Revolving Loans Converted to Term 4,285 8,041
Total 3,282,118 3,311,548
Total Loans Portfolio Segment [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 390,817 753,813
2022 598,077 678,188
2021 622,125 305,011
2020 260,737 163,481
2019 127,040 178,341
Prior 377,522 303,870
Revolving Loans Amortized Cost 864,287 862,744
Revolving Loans Converted to Term 4,215 8,041
Total 3,244,820 3,253,489
Total Loans Portfolio Segment [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 903 874
2022 2,432 122
2021 135 2,493
2020   92
2019   696
Prior 1,597 5,231
Revolving Loans Amortized Cost 3,522 6,539
Total 8,589 16,047
Total Loans Portfolio Segment [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 1,388 358
2022 1,512 8,805
2021 4,236 4,351
2020 3,271 12,720
2019 3,973 2,583
Prior 10,316 7,813
Revolving Loans Amortized Cost 3,943 5,382
Revolving Loans Converted to Term 70  
Total $ 28,709 $ 42,012