Allowance for Credit Losses - Summary of Aging Analysis of the Recorded Investment of Past-Due Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Loans, Gross	$ 766,255
Purchased Credit Impaired Loans		$ 2,409
Loans receivable	978,475	927,615
Total > 90 Days and Accruing		743
Agriculture Loans [Member]
Financing Receivable, Past Due [Line Items]
Purchased Credit Impaired Loans		0
Loans receivable		15,591
Total > 90 Days and Accruing		149
Agriculture and Farmland [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	50,584
Loans receivable	50,584
Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	65,836
Loans receivable	65,836
Commercial and Industrial [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	115,572
Loans receivable	115,572
Multifamily [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	111,853
Loans receivable	111,853	105,390
Owner Occupied [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	160,929
Loans receivable	160,929
Non-owner Occupied [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	257,344
Loans receivable	257,344	245,274
First Liens [Member]
Financing Receivable, Past Due [Line Items]
Loans receivable	172,481	168,084
Second Liens and Lines of Credit [Member]
Financing Receivable, Past Due [Line Items]
Loans receivable	27,870	35,576
Commercial and PPP Loans [Member]
Financing Receivable, Past Due [Line Items]
Purchased Credit Impaired Loans		0
Loans receivable		104,755
Total > 90 Days and Accruing		54
Commercial Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Purchased Credit Impaired Loans		2,227
Loans receivable		540,914
Total > 90 Days and Accruing		0
Residential Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Purchased Credit Impaired Loans		182
Loans receivable		250,832
Total > 90 Days and Accruing		540
Consumer Loans [Member]
Financing Receivable, Past Due [Line Items]
Purchased Credit Impaired Loans		0
Loans receivable	4,137	10,057
Total > 90 Days and Accruing		0
Municipal Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	4,137
Purchased Credit Impaired Loans		0
Loans receivable	11,869	5,466
Total > 90 Days and Accruing		0
30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	1,827	3,895
30-59 Days Past Due [Member] | Agriculture Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross		193
30-59 Days Past Due [Member] | Agriculture and Farmland [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	291
30-59 Days Past Due [Member] | Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0
30-59 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	202
30-59 Days Past Due [Member] | Multifamily [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0
30-59 Days Past Due [Member] | Owner Occupied [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	137
30-59 Days Past Due [Member] | Non-owner Occupied [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0
30-59 Days Past Due [Member] | First Liens [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	1,096
30-59 Days Past Due [Member] | Second Liens and Lines of Credit [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	97
30-59 Days Past Due [Member] | Commercial and PPP Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross		111
30-59 Days Past Due [Member] | Commercial Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross		863
30-59 Days Past Due [Member] | Residential Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross		2,474
30-59 Days Past Due [Member] | Consumer Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	4	254
30-59 Days Past Due [Member] | Municipal Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	0
60-89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	105	352
60-89 Days Past Due [Member] | Agriculture Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross		48
60-89 Days Past Due [Member] | Agriculture and Farmland [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0
60-89 Days Past Due [Member] | Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0
60-89 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0
60-89 Days Past Due [Member] | Multifamily [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0
60-89 Days Past Due [Member] | Owner Occupied [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0
60-89 Days Past Due [Member] | Non-owner Occupied [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0
60-89 Days Past Due [Member] | First Liens [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	101
60-89 Days Past Due [Member] | Second Liens and Lines of Credit [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	4
60-89 Days Past Due [Member] | Commercial and PPP Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross		21
60-89 Days Past Due [Member] | Commercial Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross		88
60-89 Days Past Due [Member] | Residential Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross		137
60-89 Days Past Due [Member] | Consumer Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	58
60-89 Days Past Due [Member] | Municipal Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	0
90 Days or Greater Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	1,952	1,569
90 Days or Greater Past Due [Member] | Agriculture Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross		149
90 Days or Greater Past Due [Member] | Agriculture and Farmland [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0
90 Days or Greater Past Due [Member] | Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	192
90 Days or Greater Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	122
90 Days or Greater Past Due [Member] | Multifamily [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0
90 Days or Greater Past Due [Member] | Owner Occupied [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0
90 Days or Greater Past Due [Member] | Non-owner Occupied [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	947
90 Days or Greater Past Due [Member] | First Liens [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	592
90 Days or Greater Past Due [Member] | Second Liens and Lines of Credit [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	96
90 Days or Greater Past Due [Member] | Commercial and PPP Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross		54
90 Days or Greater Past Due [Member] | Commercial Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross		190
90 Days or Greater Past Due [Member] | Residential Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross		1,176
90 Days or Greater Past Due [Member] | Consumer Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	3	0
90 Days or Greater Past Due [Member] | Municipal Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	0
Total Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	3,884	5,816
Total Past Due [Member] | Agriculture Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross		390
Total Past Due [Member] | Agriculture and Farmland [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	291
Total Past Due [Member] | Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	192
Total Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	324
Total Past Due [Member] | Multifamily [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0
Total Past Due [Member] | Owner Occupied [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	137
Total Past Due [Member] | Non-owner Occupied [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	947
Total Past Due [Member] | First Liens [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	1,789
Total Past Due [Member] | Second Liens and Lines of Credit [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	197
Total Past Due [Member] | Commercial and PPP Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross		186
Total Past Due [Member] | Commercial Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross		1,141
Total Past Due [Member] | Residential Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross		3,787
Total Past Due [Member] | Consumer Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	7	312
Total Past Due [Member] | Municipal Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	0
Current [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	974,591	919,390
Current [Member] | Agriculture Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross		15,201
Current [Member] | Agriculture and Farmland [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	50,293
Current [Member] | Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	65,644
Current [Member] | Commercial and Industrial [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	115,248
Current [Member] | Multifamily [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	111,853
Current [Member] | Owner Occupied [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	160,792
Current [Member] | Non-owner Occupied [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	256,397
Current [Member] | First Liens [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	170,692
Current [Member] | Second Liens and Lines of Credit [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	27,673
Current [Member] | Commercial and PPP Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross		104,569
Current [Member] | Commercial Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross		537,546
Current [Member] | Residential Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross		246,863
Current [Member] | Consumer Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	4,130	9,745
Current [Member] | Municipal Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	$ 11,869	$ 5,466