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Loans - Summary of Loan Balances (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]
Total	$ 4,826,338		$ 4,307,366
Total principal balance of loans owed, net of charge-offs	4,875,675		4,351,725
Unamortized net deferred loan fees	(20,767)		(8,927)
Discounts to principal balance of loans owed, net of charge-offs	(28,570)		(35,432)
Allowance for loan losses	(87,575)	$ (79,739)	(30,616)	$ (31,537)	$ (32,868)	$ (32,582)
Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	2,936,422		2,818,782
Allowance for loan losses	(50,294)	(44,850)	(11,995)	(11,941)	(12,099)	(12,944)
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	926,835		955,050
Allowance for loan losses	(24,007)	(23,165)	(10,084)	(10,956)	(11,128)	(11,051)
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Total	633,897		249,791
Allowance for loan losses	(4,534)	(4,018)	(4,867)	(5,471)	(6,481)	(5,610)
Construction
Loans and Leases Receivable Disclosure [Line Items]
Total	284,933		249,827
Allowance for loan losses	(7,640)	(6,775)	(3,388)	(2,953)	(2,896)	(2,497)
Agriculture production
Loans and Leases Receivable Disclosure [Line Items]
Total	40,613		32,633
Allowance for loan losses	(1,093)	(919)	(261)	(216)	(264)	(480)
Leases
Loans and Leases Receivable Disclosure [Line Items]
Total	3,638		1,283
Allowance for loan losses	(7)	(12)	(21)	0	0	0
CRE non-owner occupied | Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	1,600,284		1,609,556
Allowance for loan losses	(28,847)	(26,091)	(5,948)	(6,451)	(6,182)	(7,401)
CRE owner occupied | Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	581,090		546,434
Allowance for loan losses	(9,625)	(8,710)	(2,027)	(1,679)	(2,214)	(2,711)
Multifamily | Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	602,199		517,725
Allowance for loan losses	(10,032)	(8,581)	(3,352)	(3,151)	(3,082)	(2,429)
Farmland | Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	152,849		145,067
Allowance for loan losses	(1,790)	(1,468)	(668)	(660)	(621)	(403)
SFR 1-4 1st DT liens | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	511,759		509,508
SFR HELOCs and junior liens | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	332,820		362,886
Allowance for loan losses	(11,676)	(12,108)	(6,183)	(6,995)	(7,101)	(7,582)
Other | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	82,256		82,656
Allowance for loan losses	$ (3,394)	$ (3,042)	$ (1,595)	$ (1,555)	$ (1,451)	$ (793)

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