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Loans - Summary of Loan Balances (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable	$ 6,520,740		$ 6,450,447
Total principal balance of loans owed, net of charge-offs	6,565,576		6,496,210
Unamortized net deferred loan fees	(17,182)		(15,275)
Discounts to principal balance of loans owed, net of charge-offs	(27,654)		(30,488)
Allowance for credit losses	(117,329)	$ (108,407)	(105,680)	$ (97,944)	$ (96,049)	$ (85,376)
Commercial Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable	4,343,924		4,359,083
Allowance for credit losses	(71,016)	(64,937)	(61,381)	(55,450)	(54,992)	(51,140)
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable	1,252,225		1,240,743
Allowance for credit losses	(26,513)	(24,896)	(24,639)	(23,931)	(23,679)	(23,474)
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable	576,247		569,921
Allowance for credit losses	(11,647)	(12,069)	(13,597)	(9,979)	(9,042)	(3,862)
Construction
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable	278,425		211,560
Allowance for credit losses	(7,031)	(5,655)	(5,142)	(7,522)	(7,437)	(5,667)
Agriculture production
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable	61,337		61,414
Allowance for credit losses	(1,105)	(833)	(906)	(1,046)	(883)	(1,215)
Leases
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable	8,582		7,726
Allowance for credit losses	(17)	(17)	(15)	(16)	(16)	(18)
CRE non-owner occupied \| Commercial Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable	2,143,146		2,149,725
Allowance for credit losses	(33,042)	(32,963)	(30,962)	(28,081)	(28,055)	(25,739)
CRE owner occupied \| Commercial Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable	972,361		984,807
Allowance for credit losses	(20,208)	(14,559)	(14,014)	(12,620)	(12,071)	(10,691)
Multifamily \| Commercial Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable	951,590		944,537
Allowance for credit losses	(14,075)	(13,873)	(13,132)	(11,795)	(11,987)	(12,395)
Farmland \| Commercial Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable	276,827		280,014
Allowance for credit losses	(3,691)	(3,542)	(3,273)	(2,954)	(2,879)	(2,315)
SFR 1-4 1st DT liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable	829,346		790,349
SFR HELOCs and junior liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable	363,600		393,666
Allowance for credit losses	(10,608)	(10,914)	(11,413)	(11,591)	(10,843)	(10,510)
Other \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable	59,279		56,728
Allowance for credit losses	$ (2,771)	$ (2,062)	$ (1,958)	$ (2,029)	$ (2,167)	$ (2,241)