Loans - Loan Balances (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 8,208		$ 9,253
Allowance for credit losses	(35,280)	$ (35,149)	(28,511)
Net loans			2,049,931
Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	2,754,890		2,546,666
Allowance for credit losses	(35,280)		(28,511)
Net loans	2,719,610		2,518,155
Commercial and Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	3,587		859
Allowance for credit losses	(5,156)	(5,540)	(3,011)
Net loans			278,595
Commercial and Agriculture [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	301,877		278,595
Commercial Real Estate Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	121		110
Allowance for credit losses	(5,481)	(5,531)	(4,565)
Net loans			371,147
Commercial Real Estate Owner Occupied [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	375,851		371,147
Commercial Real Estate Non Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans			1,164
Allowance for credit losses	(11,555)	(11,646)	(14,138)
Net loans			1,018,736
Commercial Real Estate Non Owner Occupied [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,102,932		1,018,736
Residential Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	3,334		5,097
Allowance for credit losses	(6,831)	(6,515)	(3,145)
Net loans			119,991
Residential Real Estate [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	614,304		552,781
Real Estate Construction [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans			219
Allowance for credit losses	(3,739)	(3,447)	(2,293)
Net loans			198,955
Real Estate Construction [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	269,291		243,127
Farm Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans			7
Allowance for credit losses	(227)	(243)	(291)
Net loans			24,708
Farm Real Estate [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	24,109		24,708
Lease Financing Receivable [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	48,259		36,797
Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	224		416
Allowance for credit losses	(248)	$ (272)	(98)
Net loans			1,002
Consumer and Other [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 18,267		$ 20,775