Allowance for Loan Losses - Changes in the Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	$ 28,511
Charge-offs	(1,431)
Recoveries	452
Provision (Credit)	4,435
Ending Balance	37,160	$ 28,511
Beginning balance	28,511	26,641	$ 25,028
Charge-offs		(222)	(159)
Recoveries		340	942
Provision (Credit)	4,435	1,752	830	$ 10,112
Ending Balance		28,511	26,641	25,028
ASU 2016-13 [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	897
Ending Balance		897
ASU 2016-13 [Member] | CECL Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	4,296
Ending Balance		4,296
Commercial and Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	3,011
Charge-offs	(1,300)
Recoveries	177
Provision (Credit)	5,270
Ending Balance	7,587	3,011
Beginning balance	3,011	2,600	2,810
Charge-offs		(22)	(15)
Recoveries		24	165
Provision (Credit)		409	(360)
Ending Balance		3,011	2,600	2,810
Commercial and Agriculture [Member] | ASU 2016-13 [Member] | CECL Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	429
Ending Balance		429
Commercial Real Estate Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	4,565
Recoveries	15
Provision (Credit)	(951)
Ending Balance	4,723	4,565
Beginning balance	4,565	4,464	4,057
Recoveries		42	7
Provision (Credit)		59	400
Ending Balance		4,565	4,464	4,057
Commercial Real Estate Owner Occupied [Member] | ASU 2016-13 [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	19
Ending Balance		19
Commercial Real Estate Owner Occupied [Member] | ASU 2016-13 [Member] | CECL Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	1,075
Ending Balance		1,075
Commercial Real Estate Non Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	14,138
Recoveries	46
Provision (Credit)	719
Ending Balance	12,056	14,138
Beginning balance	14,138	13,860	12,451
Recoveries		74	395
Provision (Credit)		204	1,014
Ending Balance		14,138	13,860	12,451
Commercial Real Estate Non Owner Occupied [Member] | ASU 2016-13 [Member] | CECL Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	(2,847)
Ending Balance		(2,847)
Residential Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	3,145
Charge-offs	(17)
Recoveries	134
Provision (Credit)	2,299
Ending Balance	8,489	3,145
Beginning balance	3,145	2,597	2,484
Charge-offs		(97)	(120)
Recoveries		163	302
Provision (Credit)		482	69
Ending Balance		3,145	2,597	2,484
Residential Real Estate [Member] | ASU 2016-13 [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	166
Ending Balance		166
Residential Real Estate [Member] | ASU 2016-13 [Member] | CECL Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	2,762
Ending Balance		2,762
Real Estate Construction [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	2,293
Recoveries	37
Provision (Credit)	(444)
Ending Balance	3,388	2,293
Beginning balance	2,293	1,810	2,439
Recoveries		4	1
Provision (Credit)		479	630
Ending Balance		2,293	1,810	2,439
Real Estate Construction [Member] | ASU 2016-13 [Member] | CECL Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	1,502
Ending Balance		1,502
Farm Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	291
Provision (Credit)	(3)
Ending Balance	260	291
Beginning balance	291	287	338
Recoveries		6	12
Provision (Credit)		(2)	(63)
Ending Balance		291	287	338
Farm Real Estate [Member] | ASU 2016-13 [Member] | CECL Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	(28)
Ending Balance		(28)
Lease Financing Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	429
Provision (Credit)	(2,510)
Ending Balance	297	429
Beginning balance	429	0
Charge-offs		(23)
Provision (Credit)		452
Ending Balance		429	0
Lease Financing Receivable [Member] | ASU 2016-13 [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	635
Ending Balance		635
Lease Financing Receivable [Member] | ASU 2016-13 [Member] | CECL Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	1,743
Ending Balance		1,743
Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	98
Charge-offs	(114)
Recoveries	43
Provision (Credit)	36
Ending Balance	341	98
Beginning balance	98	176	209
Charge-offs		(80)	(24)
Recoveries		27	60
Provision (Credit)		(25)	(69)
Ending Balance		98	176	209
Consumer and Other [Member] | ASU 2016-13 [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	77
Ending Balance		77
Consumer and Other [Member] | ASU 2016-13 [Member] | CECL Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	201
Ending Balance		201
Unallocated [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	541
Provision (Credit)	19
Ending Balance	19	541
Beginning balance	541	847	240
Provision (Credit)		(306)	607
Ending Balance		541	$ 847	$ 240
Unallocated [Member] | ASU 2016-13 [Member] | CECL Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	$ (541)
Ending Balance		$ (541)