Loans - Summary of Loan Balances (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]
Total	$ 4,966,977	$ 4,763,127
Total principal balance of loans owed, net of charge-offs	5,009,686	4,805,596
Unamortized net deferred loan fees	(20,108)	(16,984)
Discounts to principal balance of loans owed, net of charge-offs	(22,601)	(25,485)
Allowance for loan losses	(85,941)	(91,847)	$ (57,911)	$ (30,616)
Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	3,108,624	2,951,902
Allowance for loan losses	(50,403)	(53,693)	(29,250)	(11,995)
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	1,041,213	952,108
Allowance for loan losses	(24,604)	(25,148)	(19,592)	(10,084)
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Total	551,077	526,327
Allowance for loan losses	(4,464)	(4,252)	(3,868)	(4,867)
Construction
Loans and Leases Receivable Disclosure [Line Items]
Total	221,613	284,842
Allowance for loan losses	(5,476)	(7,540)	(4,595)	(3,388)
Agriculture production
Loans and Leases Receivable Disclosure [Line Items]
Total	39,753	44,164
Allowance for loan losses	(988)	(1,209)	(595)	(261)
Leases
Loans and Leases Receivable Disclosure [Line Items]
Total	4,697	3,784
Allowance for loan losses	(6)	(5)	(11)	(21)
CRE non-owner occupied \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	1,554,927	1,535,555
Allowance for loan losses	(26,434)	(29,380)	(18,033)	(5,948)
CRE owner occupied \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	641,216	624,375
Allowance for loan losses	(9,874)	(10,861)	(5,365)	(2,027)
Multifamily \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	764,884	639,480
Allowance for loan losses	(12,371)	(11,472)	(5,140)	(3,352)
Farmland \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	147,597	152,492
Allowance for loan losses	(1,724)	(1,980)	(712)	(668)
SFR 1-4 1st DT liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	636,824	546,592
SFR HELOCs and junior liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	331,333	327,484
Allowance for loan losses	(11,079)	(11,771)	(11,196)	(6,183)
Other \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	73,056	78,032
Allowance for loan losses	$ (2,860)	$ (3,260)	$ (2,746)	$ (1,595)

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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