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Allowance for Credit Losses - Ending Allocation of Allowance for Loan Losses and Loan Balances Outstanding (Detail) - USD ($)	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Accounts Notes And Loans Receivable [Line Items]
Loans acquired with credit deterioration	$ 34,196,000	$ 28,511,000
Allowance for loan losses, Individually evaluated for impairment	469,000	7,000
Allowance for loan losses, Collectively evaluated for impairment	33,727,000	28,495,000
Allowance for loan losses, Total	34,196,000	28,511,000	$ 27,033,000	$ 26,641,000
Outstanding loan balances, Individually evaluated for impairment	4,041,000	624,000
Outstanding loan balances, Collectively evaluated for impairment	2,576,025,000	2,541,657,000
Outstanding loan balances, Total	2,580,066,000	2,546,666,000
Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans acquired with credit deterioration		9,000
Loan balance of loans acquired with credit deterioration		4,385,000
Commercial and Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans acquired with credit deterioration	3,316,000	3,011,000
Allowance for loan losses, Individually evaluated for impairment	12,000
Allowance for loan losses, Collectively evaluated for impairment	3,304,000	3,005,000
Allowance for loan losses, Total	3,316,000	3,011,000	2,584,000	2,600,000
Outstanding loan balances, Individually evaluated for impairment	165,000
Outstanding loan balances, Collectively evaluated for impairment	270,995,000	277,732,000
Outstanding loan balances, Total	271,160,000	278,595,000
Commercial and Agriculture [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans acquired with credit deterioration		6,000
Loan balance of loans acquired with credit deterioration		863,000.00
Commercial Real Estate Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans acquired with credit deterioration	5,733,000	4,565,000
Allowance for loan losses, Individually evaluated for impairment	7,000	6,000
Allowance for loan losses, Collectively evaluated for impairment	5,726,000	4,556,000
Allowance for loan losses, Total	5,733,000	4,565,000	4,594,000	4,464,000
Outstanding loan balances, Individually evaluated for impairment	1,514,000	232,000
Outstanding loan balances, Collectively evaluated for impairment	374,311,000	368,927,000
Outstanding loan balances, Total	375,825,000	371,147,000
Commercial Real Estate Owner Occupied [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans acquired with credit deterioration		3,000
Loan balance of loans acquired with credit deterioration		1,988,000
Commercial Real Estate Non Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans acquired with credit deterioration	11,760,000	14,138,000
Allowance for loan losses, Collectively evaluated for impairment	11,760,000	14,138,000
Allowance for loan losses, Total	11,760,000	14,138,000	14,577,000	13,860,000
Outstanding loan balances, Individually evaluated for impairment	119,000
Outstanding loan balances, Collectively evaluated for impairment	1,043,516,000	1,018,617,000
Outstanding loan balances, Total	1,043,635,000	1,018,736,000
Commercial Real Estate Non Owner Occupied [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts Notes And Loans Receivable [Line Items]
Loan balance of loans acquired with credit deterioration		119,000
Residential Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans acquired with credit deterioration	5,934,000	3,145,000
Allowance for loan losses, Individually evaluated for impairment	2,000	1,000
Allowance for loan losses, Collectively evaluated for impairment	5,932,000	3,144,000
Allowance for loan losses, Total	5,934,000	3,145,000	2,612,000	2,597,000
Outstanding loan balances, Individually evaluated for impairment	1,838,000	392,000
Outstanding loan balances, Collectively evaluated for impairment	559,140,000	550,975,000
Outstanding loan balances, Total	560,978,000	552,781,000
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		1,414,000
Real Estate Construction [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans acquired with credit deterioration	3,920,000	2,293,000
Allowance for loan losses, Collectively evaluated for impairment	3,920,000	2,293,000
Allowance for loan losses, Total	3,920,000	2,293,000	1,863,000	1,810,000
Outstanding loan balances, Collectively evaluated for impairment	247,253,000	243,127,000
Outstanding loan balances, Total	247,253,000	243,127,000
Farm Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans acquired with credit deterioration	269,000	291,000
Allowance for loan losses, Collectively evaluated for impairment	269,000	291,000
Allowance for loan losses, Total	269,000	291,000	249,000	287,000
Outstanding loan balances, Collectively evaluated for impairment	24,040,000	24,708,000
Outstanding loan balances, Total	24,040,000	24,708,000
Lease Financing Receivables [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans acquired with credit deterioration	2,907,000	429,000
Allowance for loan losses, Individually evaluated for impairment	371,000
Allowance for loan losses, Collectively evaluated for impairment	2,536,000	429,000
Allowance for loan losses, Total	2,907,000	429,000
Outstanding loan balances, Individually evaluated for impairment	328,000
Outstanding loan balances, Collectively evaluated for impairment	37,242,000	36,797,000
Outstanding loan balances, Total	37,570,000	36,797,000
Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans acquired with credit deterioration	354,000	98,000
Allowance for loan losses, Individually evaluated for impairment	77,000
Allowance for loan losses, Collectively evaluated for impairment	277,000	98,000
Allowance for loan losses, Total	354,000	98,000	136,000	176,000
Outstanding loan balances, Individually evaluated for impairment	77,000
Outstanding loan balances, Collectively evaluated for impairment	19,528,000	20,774,000
Outstanding loan balances, Total	19,605,000	20,775,000
Consumer and Other [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts Notes And Loans Receivable [Line Items]
Loan balance of loans acquired with credit deterioration		1,000
Unallocated [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans acquired with credit deterioration	3,000	541,000
Allowance for loan losses, Collectively evaluated for impairment	3,000	541,000
Allowance for loan losses, Total	$ 3,000	$ 541,000	$ 418,000	$ 847,000

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