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Loans - Analysis of Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Balance at beginning of year |  | $ 17,847 | $ 21,575 | $ 17,283 | $ 17,283
Charge Offs | $ (60) | (117) | (182) | (211) | (827)
Recoveries | 193 | 142 | 255 | 185 | 298
Provision for credit losses-loans | 143 | 1,628 | 960 | 2,208 | 4,600
Provision for credit losses-off balance sheet credit exposures | (129) |  | (67) |  |
Other Non-interest expense related to unfunded |  | 91 |  | 126 | 221
Balance at ending of year |  | 19,591 |  | 19,591 | 21,575
Ending balance: individually evaluated for impairment |  | 2,419 |  | 2,419 | 1,996
Ending balance: collectively evaluated for impairment |  | 17,172 |  | 17,172 | 19,579
Ending balance: loans acquired with deteriorated credit quality |  |  |  |  | 0
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 2,515,793 | 2,034,818 | $ 2,515,793 | 2,034,818 | 2,356,387
Ending balance: individually evaluated for impairment |  | 10,669 |  | 10,669 | 8,857
Ending balance: collectively evaluated for impairment |  | 2,023,141 |  | 2,023,141 | 2,346,871
Ending balance: loans acquired with deteriorated credit quality |  | 1,008 |  | 1,008 | 659
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Accounting Standards Update [Extensible Enumeration] |  |  | Accounting Standards Update 2016-13 [Member] |  |
Consumer Real Estate [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Balance at beginning of year |  | 892 | $ 998 | 857 | 857
Recoveries | 6 | 4 | 13 | 9 | 20
Provision for credit losses-loans | 369 | 43 | 113 | 73 | 121
Balance at ending of year |  | 939 |  | 939 | 998
Ending balance: individually evaluated for impairment |  |  |  |  | 6
Ending balance: collectively evaluated for impairment |  | 939 |  | 939 | 992
Ending balance: loans acquired with deteriorated credit quality |  | 0 |  | 0 | 0
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 506,842 | 410,468 | 506,842 | 410,468 | 494,423
Ending balance: individually evaluated for impairment |  | 657 |  | 657 | 569
Ending balance: collectively evaluated for impairment |  | 409,318 |  | 409,318 | 493,449
Ending balance: loans acquired with deteriorated credit quality |  | 493 |  | 493 | 405
Agricultural Real Estate [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Balance at beginning of year |  | 606 | 349 | 1,040 | 1,040
Recoveries | 104 |  | 104 |  |
Provision for credit losses-loans | (76) | (260) | (50) | (694) | (691)
Balance at ending of year |  | 346 |  | 346 | 349
Ending balance: individually evaluated for impairment |  |  |  |  | 0
Ending balance: collectively evaluated for impairment |  | 346 |  | 346 | 349
Ending balance: loans acquired with deteriorated credit quality |  | 0 |  | 0 | 0
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 230,531 | 199,650 | 230,531 | 199,650 | 220,514
Ending balance: individually evaluated for impairment |  | 2,414 |  | 2,414 | 2,280
Ending balance: collectively evaluated for impairment |  | 197,039 |  | 197,039 | 218,039
Ending balance: loans acquired with deteriorated credit quality |  | 197 |  | 197 | 195
Agricultural [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Balance at beginning of year |  | 844 | 751 | 709 | 709
Recoveries |  |  |  |  | 7
Provision for credit losses-loans | 41 | (90) | 6 | 45 | 35
Balance at ending of year |  | 754 |  | 754 | 751
Ending balance: individually evaluated for impairment |  |  |  |  | 0
Ending balance: collectively evaluated for impairment |  | 754 |  | 754 | 751
Ending balance: loans acquired with deteriorated credit quality |  | 0 |  | 0 | 0
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 128,593 | 127,340 | 128,593 | 127,340 | 128,926
Ending balance: individually evaluated for impairment |  | 1,296 |  | 1,296 | 152
Ending balance: collectively evaluated for impairment |  | 126,044 |  | 126,044 | 128,774
Commercial Real Estate [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Balance at beginning of year |  | 9,573 | 11,924 | 9,130 | 9,130
Recoveries | 3 | 3 | 5 | 5 | 9
Provision for credit losses-loans | 590 | 851 | 1,251 | 1,292 | 2,785
Balance at ending of year |  | 10,427 |  | 10,427 | 11,924
Ending balance: individually evaluated for impairment |  |  |  |  | 438
Ending balance: collectively evaluated for impairment |  | 10,427 |  | 10,427 | 11,486
Ending balance: loans acquired with deteriorated credit quality |  | 0 |  | 0 | 0
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 1,278,445 | 977,588 | 1,278,445 | 977,588 | 1,150,511
Ending balance: individually evaluated for impairment |  | 4,133 |  | 4,133 | 4,108
Ending balance: collectively evaluated for impairment |  | 973,258 |  | 973,258 | 1,146,389
Ending balance: loans acquired with deteriorated credit quality |  | 197 |  | 197 | 14
Commercial and Industrial [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Balance at beginning of year |  | 4,066 | 5,382 | 3,847 | 3,847
Charge Offs |  |  |  | (6) | (418)
Recoveries | 6 | 65 | 12 | 74 | 93
Provision for credit losses-loans | (653) | 1,234 | (462) | 1,450 | 1,860
Balance at ending of year |  | 5,365 |  | 5,365 | 5,382
Ending balance: individually evaluated for impairment |  | 2,419 |  | 2,419 | 1,551
Ending balance: collectively evaluated for impairment |  | 2,946 |  | 2,946 | 3,831
Ending balance: loans acquired with deteriorated credit quality |  | 0 |  | 0 | 0
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 282,244 | 264,124 | 282,244 | 264,124 | 272,119
Ending balance: individually evaluated for impairment |  | 2,149 |  | 2,149 | 1,581
Ending balance: collectively evaluated for impairment |  | 261,854 |  | 261,854 | 270,493
Ending balance: loans acquired with deteriorated credit quality |  | 121 |  | 121 | 45
Consumer [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Balance at beginning of year |  | 623 | 891 | 625 | 625
Charge Offs | (60) | (117) | (182) | (205) | (409)
Recoveries | 74 | 70 | 121 | 97 | 169
Provision for credit losses-loans | (128) | (9) | 102 | 50 | 506
Balance at ending of year |  | 567 |  | 567 | 891
Ending balance: individually evaluated for impairment |  |  |  |  | 1
Ending balance: collectively evaluated for impairment |  | 567 |  | 567 | 890
Ending balance: loans acquired with deteriorated credit quality |  | 0 |  | 0 | 0
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 89,138 | 55,648 | 89,138 | 55,648 | 89,894
Ending balance: individually evaluated for impairment |  | 20 |  | 20 | 167
Ending balance: collectively evaluated for impairment |  | 55,628 |  | 55,628 | 89,727
Unallocated [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Balance at beginning of year |  | 167 | 18 | 34 | 34
Provision for credit losses-loans |  | (141) |  | (8) | (16)
Balance at ending of year |  | 26 |  | 26 | 18
Ending balance: collectively evaluated for impairment |  | 26 |  | 26 | 18
Ending balance: loans acquired with deteriorated credit quality |  | 0 |  | 0 | 0
Unfunded Loan Commitment & Letters of Credit [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Balance at beginning of year | 2,228 | 1,076 | 1,262 | 1,041 | 1,041
Provision for credit losses-off balance sheet credit exposures | (129) |  | (67) |  |
Other Non-interest expense related to unfunded |  | 91 |  | 126 | 221
Balance at ending of year | $ 2,099 | 1,167 | 2,099 | 1,167 | 1,262
Ending balance: collectively evaluated for impairment |  | 1,167 |  | 1,167 | 1,262
Ending balance: loans acquired with deteriorated credit quality |  | $ 0 |  | $ 0 | 0
Unfunded Loan Commitment & Letters of Credit [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Balance at beginning of year |  |  | $ 904 |  |
Balance at ending of year |  |  |  |  | $ 904

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