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Loans - Analysis of Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
ALLOWANCE FOR CREDIT LOSSES:      
Balance at beginning of year $ 21,575 $ 17,283 $ 17,283
Charge Offs (122) (94) (827)
Recoveries 62 43 298
Provision for credit losses-loans 817 580 4,600
Provision for credit losses-off balance sheet credit exposures 62    
Other Non-interest expense related to unfunded   35 221
Balance at ending of year   17,847 21,575
Ending balance: individually evaluated for impairment   1,535 1,996
Ending balance: collectively evaluated for impairment   16,312 19,579
Ending balance: loans acquired with deteriorated credit quality     0
FINANCING RECEIVABLES:      
Ending balance $ 2,446,652 1,962,220 2,356,387
Ending balance: individually evaluated for impairment   12,624 8,857
Ending balance: collectively evaluated for impairment   1,948,149 2,346,871
Ending balance: loans acquired with deteriorated credit quality   1,447 659
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 $ 998 857 857
Recoveries 7 5 20
Provision for credit losses-loans (256) 30 121
Balance at ending of year   892 998
Ending balance: individually evaluated for impairment     6
Ending balance: collectively evaluated for impairment   892 992
Ending balance: loans acquired with deteriorated credit quality   0 0
FINANCING RECEIVABLES:      
Ending balance 502,968 410,064 494,423
Ending balance: individually evaluated for impairment   692 569
Ending balance: collectively evaluated for impairment   408,694 493,449
Ending balance: loans acquired with deteriorated credit quality   678 405
Agricultural Real Estate [Member]      
ALLOWANCE FOR CREDIT LOSSES:      
Balance at beginning of year 349 1,040 1,040
Provision for credit losses-loans 26 (434) (691)
Balance at ending of year   606 349
Ending balance: individually evaluated for impairment   273 0
Ending balance: collectively evaluated for impairment   333 349
Ending balance: loans acquired with deteriorated credit quality   0 0
FINANCING RECEIVABLES:      
Ending balance 227,599 195,901 220,514
Ending balance: individually evaluated for impairment   6,670 2,280
Ending balance: collectively evaluated for impairment   189,033 218,039
Ending balance: loans acquired with deteriorated credit quality   198 195
Agricultural [Member]      
ALLOWANCE FOR CREDIT LOSSES:      
Balance at beginning of year 751 709 709
Recoveries     7
Provision for credit losses-loans (35) 135 35
Balance at ending of year   844 751
Ending balance: individually evaluated for impairment     0
Ending balance: collectively evaluated for impairment   844 751
Ending balance: loans acquired with deteriorated credit quality   0 0
FINANCING RECEIVABLES:      
Ending balance 131,677 140,847 128,926
Ending balance: individually evaluated for impairment   20 152
Ending balance: collectively evaluated for impairment   140,827 128,774
Commercial Real Estate [Member]      
ALLOWANCE FOR CREDIT LOSSES:      
Balance at beginning of year 11,924 9,130 9,130
Recoveries 2 2 9
Provision for credit losses-loans 661 441 2,785
Balance at ending of year   9,573 11,924
Ending balance: individually evaluated for impairment   632 438
Ending balance: collectively evaluated for impairment   8,941 11,486
Ending balance: loans acquired with deteriorated credit quality   0 0
FINANCING RECEIVABLES:      
Ending balance 1,223,163 909,408 1,150,511
Ending balance: individually evaluated for impairment   4,097 4,108
Ending balance: collectively evaluated for impairment   905,076 1,146,389
Ending balance: loans acquired with deteriorated credit quality   235 14
Commercial and Industrial [Member]      
ALLOWANCE FOR CREDIT LOSSES:      
Balance at beginning of year 5,382 3,847 3,847
Charge Offs   (6) (418)
Recoveries 6 9 93
Provision for credit losses-loans 191 216 1,860
Balance at ending of year   4,066 5,382
Ending balance: individually evaluated for impairment   630 1,551
Ending balance: collectively evaluated for impairment   3,436 3,831
Ending balance: loans acquired with deteriorated credit quality   0 0
FINANCING RECEIVABLES:      
Ending balance 270,857 248,362 272,119
Ending balance: individually evaluated for impairment   1,122 1,581
Ending balance: collectively evaluated for impairment   246,904 270,493
Ending balance: loans acquired with deteriorated credit quality   336 45
Consumer [Member]      
ALLOWANCE FOR CREDIT LOSSES:      
Balance at beginning of year 891 625 625
Charge Offs (122) (88) (409)
Recoveries 47 27 169
Provision for credit losses-loans 230 59 506
Balance at ending of year   623 891
Ending balance: individually evaluated for impairment     1
Ending balance: collectively evaluated for impairment   623 890
Ending balance: loans acquired with deteriorated credit quality   0 0
FINANCING RECEIVABLES:      
Ending balance 90,388 57,638 89,894
Ending balance: individually evaluated for impairment   23 167
Ending balance: collectively evaluated for impairment   57,615 89,727
Unallocated [Member]      
ALLOWANCE FOR CREDIT LOSSES:      
Balance at beginning of year 18 34 34
Provision for credit losses-loans   133 (16)
Balance at ending of year   167 18
Ending balance: collectively evaluated for impairment   167 18
Ending balance: loans acquired with deteriorated credit quality   0 0
Unfunded Loan Commitment & Letters of Credit [Member]      
ALLOWANCE FOR CREDIT LOSSES:      
Balance at beginning of year 1,262 1,041 1,041
Provision for credit losses-off balance sheet credit exposures 62    
Other Non-interest expense related to unfunded   35 221
Balance at ending of year 2,228 1,076 1,262
Ending balance: collectively evaluated for impairment   1,076 1,262
Ending balance: loans acquired with deteriorated credit quality   $ 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