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Allowance for Credit Losses on Loans - Analysis of Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Total	$ 4,801,405	$ 4,307,366
Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	2,905,485	2,818,782
Consumer
Financing Receivable, Past Due [Line Items]
Total	945,669	955,050
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	634,481	249,791
Construction
Financing Receivable, Past Due [Line Items]
Total	278,566	249,827
Agriculture production
Financing Receivable, Past Due [Line Items]
Total	35,441	32,633
Leases
Financing Receivable, Past Due [Line Items]
Total	1,763	1,283
CRE non-owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	1,596,941	1,609,556
CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	579,803	546,434
Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	577,217	517,725
Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	151,524	145,067
SFR 1-4 1st DT Liens | Consumer
Financing Receivable, Past Due [Line Items]
Total	506,069	509,508
SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Total	358,087	362,886
Other | Consumer
Financing Receivable, Past Due [Line Items]
Total	81,513	82,656
Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Past due	16,622	10,720
Current	4,784,783	4,296,646
Total	4,801,405	4,307,366
Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	8,102	3,148
Current	2,897,383	2,815,634
Total	2,905,485	2,818,782
Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Past due	6,537	6,599
Current	939,132	948,451
Total	945,669	955,050
Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due	1,699	924
Current	632,782	248,867
Total	634,481	249,791
Financial Asset Originated | Construction
Financing Receivable, Past Due [Line Items]
Past due	19	0
Current	278,547	249,827
Total	278,566	249,827
Financial Asset Originated | Agriculture production
Financing Receivable, Past Due [Line Items]
Past due	265	49
Current	35,176	32,584
Total	35,441	32,633
Financial Asset Originated | Leases
Financing Receivable, Past Due [Line Items]
Past due	0	0
Current	1,763	1,283
Total	1,763	1,283
Financial Asset Originated | CRE non-owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	3,369	518
Current	1,593,572	1,609,038
Total	1,596,941	1,609,556
Financial Asset Originated | CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	2,529	293
Current	577,274	546,141
Total	579,803	546,434
Financial Asset Originated | Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	2,024	2,307
Current	575,193	515,418
Total	577,217	517,725
Financial Asset Originated | Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	180	30
Current	151,344	145,037
Total	151,524	145,067
Financial Asset Originated | SFR 1-4 1st DT Liens | Consumer
Financing Receivable, Past Due [Line Items]
Past due	3,316	3,477
Current	502,753	506,031
Total	506,069	509,508
Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Past due	2,827	2,926
Current	355,260	359,960
Total	358,087	362,886
Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Past due	394	196
Current	81,119	82,460
Total	81,513	82,656
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Past due	4,818	3,812
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	3,723	581
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Past due	210	2,579
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due	751	603
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Construction
Financing Receivable, Past Due [Line Items]
Past due	19	0
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Agriculture production
Financing Receivable, Past Due [Line Items]
Past due	115	49
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Leases
Financing Receivable, Past Due [Line Items]
Past due	0	0
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | CRE non-owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	2,589	268
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	954	0
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	0	283
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	180	30
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | SFR 1-4 1st DT Liens | Consumer
Financing Receivable, Past Due [Line Items]
Past due	0	1,149
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Past due	125	1,258
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Past due	85	172
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Past due	4,350	1,385
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	1,855	136
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Past due	1,728	952
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due	767	297
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Construction
Financing Receivable, Past Due [Line Items]
Past due	0	0
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Agriculture production
Financing Receivable, Past Due [Line Items]
Past due	0	0
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Leases
Financing Receivable, Past Due [Line Items]
Past due	0	0
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | CRE non-owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	667	136
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	1,188
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	0	0
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	0	0
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | SFR 1-4 1st DT Liens | Consumer
Financing Receivable, Past Due [Line Items]
Past due	1,046	371
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Past due	453	580
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Past due	229	1
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Past due	7,454	5,523
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	2,524	2,431
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Past due	4,599	3,068
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due	181	24
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | Construction
Financing Receivable, Past Due [Line Items]
Past due	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | Agriculture production
Financing Receivable, Past Due [Line Items]
Past due	150	0
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | Leases
Financing Receivable, Past Due [Line Items]
Past due	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | CRE non-owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	113	114
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	387	293
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	2,024	2,024
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | SFR 1-4 1st DT Liens | Consumer
Financing Receivable, Past Due [Line Items]
Past due	2,270	1,957
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Past due	2,249	1,088
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Past due	$ 80	$ 23

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Amount of financing receivable not past due.

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