Allowance for Credit Losses - Summary of Aging Analysis of the Recorded Investment of Past-Due Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Loans, Gross	$ 2,215,234	$ 2,128,110
Loans receivable	2,189,326	2,104,517
Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans receivable	2,215,234	2,128,110
Agriculture and Farmland [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans receivable	65,166	65,861
Construction [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans receivable	162,032	161,825
Commercial and Industrial [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans receivable	235,144	232,412
Multifamily [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans receivable	206,867	176,843
Owner Occupied [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans receivable	479,361	474,964
Non-owner Occupied [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans receivable	598,681	551,481
First Liens [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans receivable	374,130	376,092
Second Liens and Lines of Credit [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans receivable	72,061	66,648
Consumer Loans [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans receivable	4,296	5,244
Municipal Loans [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans receivable	17,496	16,740
30-59 Days Past Due [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	2,222	1,239
30-59 Days Past Due [Member] | Agriculture and Farmland [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	91	14
30-59 Days Past Due [Member] | Construction [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	771	10
30-59 Days Past Due [Member] | Commercial and Industrial [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	69	46
30-59 Days Past Due [Member] | Multifamily [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	163	0
30-59 Days Past Due [Member] | Owner Occupied [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	156
30-59 Days Past Due [Member] | Non-owner Occupied [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	200	0
30-59 Days Past Due [Member] | First Liens [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	485	719
30-59 Days Past Due [Member] | Second Liens and Lines of Credit [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	419	279
30-59 Days Past Due [Member] | Consumer Loans [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	24	15
30-59 Days Past Due [Member] | Municipal Loans [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	0
60-89 Days Past Due [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	440	3,451
60-89 Days Past Due [Member] | Agriculture and Farmland [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	0
60-89 Days Past Due [Member] | Construction [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	10	0
60-89 Days Past Due [Member] | Commercial and Industrial [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	1
60-89 Days Past Due [Member] | Multifamily [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	0
60-89 Days Past Due [Member] | Owner Occupied [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	177	2,802
60-89 Days Past Due [Member] | Non-owner Occupied [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	86
60-89 Days Past Due [Member] | First Liens [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	197	419
60-89 Days Past Due [Member] | Second Liens and Lines of Credit [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	53	128
60-89 Days Past Due [Member] | Consumer Loans [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	3	15
60-89 Days Past Due [Member] | Municipal Loans [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	0
90 Days or Greater Past Due [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	12,193	2,661
90 Days or Greater Past Due [Member] | Agriculture and Farmland [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	0
90 Days or Greater Past Due [Member] | Construction [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	87	191
90 Days or Greater Past Due [Member] | Commercial and Industrial [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	411	118
90 Days or Greater Past Due [Member] | Multifamily [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	0
90 Days or Greater Past Due [Member] | Owner Occupied [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	9,618	137
90 Days or Greater Past Due [Member] | Non-owner Occupied [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	401	1,239
90 Days or Greater Past Due [Member] | First Liens [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	1,187	872
90 Days or Greater Past Due [Member] | Second Liens and Lines of Credit [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	337	97
90 Days or Greater Past Due [Member] | Consumer Loans [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	152	7
90 Days or Greater Past Due [Member] | Municipal Loans [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	0
Total Past Due [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	14,855	7,351
Total Past Due [Member] | Agriculture and Farmland [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	91	14
Total Past Due [Member] | Construction [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	868	201
Total Past Due [Member] | Commercial and Industrial [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	480	165
Total Past Due [Member] | Multifamily [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	163	0
Total Past Due [Member] | Owner Occupied [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	9,795	3,095
Total Past Due [Member] | Non-owner Occupied [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	601	1,325
Total Past Due [Member] | First Liens [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	1,869	2,010
Total Past Due [Member] | Second Liens and Lines of Credit [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	809	504
Total Past Due [Member] | Consumer Loans [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	179	37
Total Past Due [Member] | Municipal Loans [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	0
Current [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	2,200,379	2,120,759
Current [Member] | Agriculture and Farmland [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	65,075	65,847
Current [Member] | Construction [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	161,164	161,624
Current [Member] | Commercial and Industrial [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	234,664	232,247
Current [Member] | Multifamily [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	206,704	176,843
Current [Member] | Owner Occupied [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	469,566	471,869
Current [Member] | Non-owner Occupied [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	598,080	550,156
Current [Member] | First Liens [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	372,261	374,082
Current [Member] | Second Liens and Lines of Credit [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	71,252	66,144
Current [Member] | Consumer Loans [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	4,117	5,207
Current [Member] | Municipal Loans [Member] | Loans, Aging Analysis [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	$ 17,496	$ 16,740