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Loans - Analysis of Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
ALLOWANCE FOR CREDIT LOSSES:          
Balance at beginning of year   $ 19,591 $ 21,575 $ 17,283 $ 17,283
Charge Offs $ (148) (123) (330) (334) (827)
Recoveries 55 52 310 237 298
Provision for credit losses-loans 460 1,637 1,420 3,845 4,600
Provision for credit losses-off balance sheet credit exposures (76)   (143)    
Other Non-interest expense related to unfunded   (49)   77 221
Balance at ending of year   21,108   21,108 21,575
Ending balance: individually evaluated for impairment   2,436   2,436 1,996
Ending balance: collectively evaluated for impairment   18,672   18,672 19,579
Ending balance: loans acquired with deteriorated credit quality         0
FINANCING RECEIVABLES:          
Ending balance 2,529,606 2,142,616 $ 2,529,606 2,142,616 2,356,387
Ending balance: individually evaluated for impairment   10,753   10,753 8,857
Ending balance: collectively evaluated for impairment   2,131,131   2,131,131 2,346,871
Ending balance: loans acquired with deteriorated credit quality   732   732 659
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   939 $ 998 857 857
Recoveries 14 6 27 15 20
Provision for credit losses-loans (170) 19 (57) 54 121
Balance at ending of year   926   926 998
Ending balance: individually evaluated for impairment         6
Ending balance: collectively evaluated for impairment   926   926 992
Ending balance: loans acquired with deteriorated credit quality   0   0 0
FINANCING RECEIVABLES:          
Ending balance 512,990 416,044 512,990 416,044 494,423
Ending balance: individually evaluated for impairment   624   624 569
Ending balance: collectively evaluated for impairment   414,951   414,951 493,449
Ending balance: loans acquired with deteriorated credit quality   469   469 405
Agricultural Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Balance at beginning of year   346 349 1,040 1,040
Recoveries 1   105    
Provision for credit losses-loans 77 (10) 27 (684) (691)
Balance at ending of year   356   356 349
Ending balance: individually evaluated for impairment         0
Ending balance: collectively evaluated for impairment   356   356 349
Ending balance: loans acquired with deteriorated credit quality   0   0 0
FINANCING RECEIVABLES:          
Ending balance 225,370 204,787 225,370 204,787 220,514
Ending balance: individually evaluated for impairment   2,588   2,588 2,280
Ending balance: collectively evaluated for impairment   202,003   202,003 218,039
Ending balance: loans acquired with deteriorated credit quality   196   196 195
Agricultural [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Balance at beginning of year   754 751 709 709
Recoveries   1   1 7
Provision for credit losses-loans 78 (1) 84 46 35
Balance at ending of year   756   756 751
Ending balance: individually evaluated for impairment         0
Ending balance: collectively evaluated for impairment   756   756 751
Ending balance: loans acquired with deteriorated credit quality   0   0 0
FINANCING RECEIVABLES:          
Ending balance 123,971 128,818 123,971 128,818 128,926
Ending balance: individually evaluated for impairment   1,334   1,334 152
Ending balance: collectively evaluated for impairment   127,484   127,484 128,774
Commercial Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Balance at beginning of year   10,427 11,924 9,130 9,130
Recoveries 1 2 6 7 9
Provision for credit losses-loans 123 (1,122) 1,374 2,414 2,785
Balance at ending of year   11,551   11,551 11,924
Ending balance: individually evaluated for impairment   500   500 438
Ending balance: collectively evaluated for impairment   11,051   11,051 11,486
Ending balance: loans acquired with deteriorated credit quality   0   0 0
FINANCING RECEIVABLES:          
Ending balance 1,301,614 1,061,904 1,301,614 1,061,904 1,150,511
Ending balance: individually evaluated for impairment   4,187   4,187 4,108
Ending balance: collectively evaluated for impairment   1,057,699   1,057,699 1,146,389
Ending balance: loans acquired with deteriorated credit quality   18   18 14
Commercial and Industrial [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Balance at beginning of year   5,365 5,382 3,847 3,847
Charge Offs       (6) (418)
Recoveries 6 8 18 82 93
Provision for credit losses-loans (65) 297 (527) 1,747 1,860
Balance at ending of year   5,670   5,670 5,382
Ending balance: individually evaluated for impairment   1,936   1,936 1,551
Ending balance: collectively evaluated for impairment   3,734   3,734 3,831
Ending balance: loans acquired with deteriorated credit quality   0   0 0
FINANCING RECEIVABLES:          
Ending balance 281,839 260,000 281,839 260,000 272,119
Ending balance: individually evaluated for impairment   2,003   2,003 1,581
Ending balance: collectively evaluated for impairment   257,948   257,948 270,493
Ending balance: loans acquired with deteriorated credit quality   49   49 45
Consumer [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Balance at beginning of year   567 891 625 625
Charge Offs (148) (123) (330) (328) (409)
Recoveries 33 35 154 132 169
Provision for credit losses-loans 417 246 519 296 506
Balance at ending of year   725   725 891
Ending balance: individually evaluated for impairment         1
Ending balance: collectively evaluated for impairment   725   725 890
Ending balance: loans acquired with deteriorated credit quality   0   0 0
FINANCING RECEIVABLES:          
Ending balance 83,822 71,063 83,822 71,063 89,894
Ending balance: individually evaluated for impairment   17   17 167
Ending balance: collectively evaluated for impairment   71,046   71,046 89,727
Unallocated [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Balance at beginning of year   26 18 34 34
Provision for credit losses-loans   20   (28) (16)
Balance at ending of year   6   6 18
Ending balance: collectively evaluated for impairment   6   6 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 2,099 1,167 1,262 1,041 1,041
Provision for credit losses-off balance sheet credit exposures (76)   (143)    
Other Non-interest expense related to unfunded   (49)   77 221
Balance at ending of year $ 2,023 1,118 2,023 1,118 1,262
Ending balance: collectively evaluated for impairment   1,118   1,118 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