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Allowance for Loan Losses - Ending Allocation of Allowance for Loan Losses and Loan Balances Outstanding (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]
Allowance for loan losses, Individually evaluated for impairment	$ 14		$ 18
Allowance for loan losses, Collectively evaluated for impairment	27,421		26,623
Allowance for loan losses, Total	27,435	$ 27,033	26,641	$ 26,197	$ 26,133	$ 25,028
Outstanding loan balances, Individually evaluated for impairment	1,088		1,222
Outstanding loan balances, Collectively evaluated for impairment	2,062,857		1,996,367
Outstanding loan balances, Total	2,064,221		1,997,879
Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts Notes And Loans Receivable [Line Items]
Loan balance of loans acquired with credit deterioration	276		290
Commercial and Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Allowance for loan losses, Collectively evaluated for impairment	2,790		2,600
Allowance for loan losses, Total	2,790	2,584	2,600	2,320	2,360	2,810
Outstanding loan balances, Collectively evaluated for impairment	226,540		246,502
Outstanding loan balances, Total	226,540		246,502
Commercial Real Estate Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Allowance for loan losses, Individually evaluated for impairment	6		7
Allowance for loan losses, Collectively evaluated for impairment	4,723		4,457
Allowance for loan losses, Total	4,729	4,594	4,464	4,027	4,049	4,057
Outstanding loan balances, Individually evaluated for impairment	175		187
Outstanding loan balances, Collectively evaluated for impairment	304,297		295,265
Outstanding loan balances, Total	304,472		295,452
Commercial Real Estate Non Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Allowance for loan losses, Collectively evaluated for impairment	14,711		13,860
Allowance for loan losses, Total	14,711	14,577	13,860	13,546	13,209	12,451
Outstanding loan balances, Individually evaluated for impairment			0
Outstanding loan balances, Collectively evaluated for impairment	876,695		829,310
Outstanding loan balances, Total	876,695		829,310
Residential Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Allowance for loan losses, Individually evaluated for impairment	8		11
Allowance for loan losses, Collectively evaluated for impairment	2,851		2,586
Allowance for loan losses, Total	2,859	2,612	2,597	2,531	2,509	2,484
Outstanding loan balances, Individually evaluated for impairment	419		526
Outstanding loan balances, Collectively evaluated for impairment	451,933		429,244
Outstanding loan balances, Total	452,628		430,060
Residential Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts Notes And Loans Receivable [Line Items]
Loan balance of loans acquired with credit deterioration	276		290
Real Estate Construction [Member]
Accounts Notes And Loans Receivable [Line Items]
Allowance for loan losses, Collectively evaluated for impairment	1,969		1,810
Allowance for loan losses, Total	1,969	1,863	1,810	2,177	2,902	2,439
Outstanding loan balances, Collectively evaluated for impairment	170,633		157,127
Outstanding loan balances, Total	170,633		157,127
Farm Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Allowance for loan losses, Collectively evaluated for impairment	236		287
Allowance for loan losses, Total	236	249	287	290	283	338
Outstanding loan balances, Individually evaluated for impairment	494		509
Outstanding loan balances, Collectively evaluated for impairment	22,801		27,910
Outstanding loan balances, Total	23,295		28,419
Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Allowance for loan losses, Collectively evaluated for impairment	130		176
Allowance for loan losses, Total	130	136	176	202	170	209
Outstanding loan balances, Collectively evaluated for impairment	9,958		11,009
Outstanding loan balances, Total	9,958		11,009
Unallocated [Member]
Accounts Notes And Loans Receivable [Line Items]
Allowance for loan losses, Collectively evaluated for impairment	11		847
Allowance for loan losses, Total	$ 11	$ 418	$ 847	$ 1,104	$ 651	$ 240

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Amount of allowance for credit loss on accounts receivable.

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