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Allowance for Credit Losses - Analysis of Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Total	$ 4,887,496	$ 4,763,127
Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	3,222,737	2,951,902
Consumer
Financing Receivable, Past Due [Line Items]
Total	1,053,653	952,108
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	345,027	526,327
Construction
Financing Receivable, Past Due [Line Items]
Total	216,680	284,842
Agriculture production
Financing Receivable, Past Due [Line Items]
Total	44,410	44,164
Leases
Financing Receivable, Past Due [Line Items]
Total	4,989	3,784
CRE non-owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	1,526,030	1,535,555
CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	701,041	624,375
Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	829,644	639,480
Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	166,022	152,492
SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Total	662,343	546,592
SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Total	323,258	327,484
Other | Consumer
Financing Receivable, Past Due [Line Items]
Total	68,052	78,032
Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Past due	10,539	6,767
Current	4,876,957	4,756,360
Total	4,887,496	4,763,127
Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	6,477	2,629
Current	3,216,260	2,949,273
Total	3,222,737	2,951,902
Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Past due	3,327	3,452
Current	1,050,326	948,656
Total	1,053,653	952,108
Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due	567	686
Current	344,460	525,641
Total	345,027	526,327
Financial Asset Originated | Construction
Financing Receivable, Past Due [Line Items]
Past due	0	0
Current	216,680	284,842
Total	216,680	284,842
Financial Asset Originated | Agriculture production
Financing Receivable, Past Due [Line Items]
Past due	168	0
Current	44,242	44,164
Total	44,410	44,164
Financial Asset Originated | Leases
Financing Receivable, Past Due [Line Items]
Past due	0	0
Current	4,989	3,784
Total	4,989	3,784
Financial Asset Originated | CRE non-owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	930	539
Current	1,525,100	1,535,016
Total	1,526,030	1,535,555
Financial Asset Originated | CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	193	1,121
Current	700,848	623,254
Total	701,041	624,375
Financial Asset Originated | Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	4,729	0
Current	824,915	639,480
Total	829,644	639,480
Financial Asset Originated | Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	625	969
Current	165,397	151,523
Total	166,022	152,492
Financial Asset Originated | SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Past due	403	997
Current	661,940	545,595
Total	662,343	546,592
Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Past due	2,841	2,301
Current	320,417	325,183
Total	323,258	327,484
Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Past due	83	154
Current	67,969	77,878
Total	68,052	78,032
30-59 days | Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Past due	7,425	1,974
30-59 days | Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	5,732	1,323
30-59 days | Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Past due	1,267	496
30-59 days | Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due	377	155
30-59 days | Financial Asset Originated | Construction
Financing Receivable, Past Due [Line Items]
Past due	0	0
30-59 days | Financial Asset Originated | Agriculture production
Financing Receivable, Past Due [Line Items]
Past due	49	0
30-59 days | Financial Asset Originated | Leases
Financing Receivable, Past Due [Line Items]
Past due	0	0
30-59 days | Financial Asset Originated | CRE non-owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	810	127
30-59 days | Financial Asset Originated | CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	193	297
30-59 days | Financial Asset Originated | Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	4,729	0
30-59 days | Financial Asset Originated | Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	0	899
30-59 days | Financial Asset Originated | SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Past due	24	37
30-59 days | Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Past due	1,220	418
30-59 days | Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Past due	23	41
60-89 days | Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Past due	516	824
60-89 days | Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	50	173
60-89 days | Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Past due	403	225
60-89 days | Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due	63	426
60-89 days | Financial Asset Originated | Construction
Financing Receivable, Past Due [Line Items]
Past due	0	0
60-89 days | Financial Asset Originated | Agriculture production
Financing Receivable, Past Due [Line Items]
Past due	0	0
60-89 days | Financial Asset Originated | Leases
Financing Receivable, Past Due [Line Items]
Past due	0	0
60-89 days | Financial Asset Originated | CRE non-owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	0	173
60-89 days | Financial Asset Originated | CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	0
60-89 days | Financial Asset Originated | Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due		0
60-89 days | Financial Asset Originated | Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	50	0
60-89 days | Financial Asset Originated | SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Past due	163	0
60-89 days | Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Past due	205	212
60-89 days | Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Past due	35	13
> 90 days | Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Past due	2,598	3,969
> 90 days | Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	695	1,133
> 90 days | Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Past due	1,657	2,731
> 90 days | Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due	127	105
> 90 days | Financial Asset Originated | Construction
Financing Receivable, Past Due [Line Items]
Past due	0	0
> 90 days | Financial Asset Originated | Agriculture production
Financing Receivable, Past Due [Line Items]
Past due	119	0
> 90 days | Financial Asset Originated | Leases
Financing Receivable, Past Due [Line Items]
Past due	0	0
> 90 days | Financial Asset Originated | CRE non-owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	120	239
> 90 days | Financial Asset Originated | CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	0	824
> 90 days | Financial Asset Originated | Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due		0
> 90 days | Financial Asset Originated | Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due	575	70
> 90 days | Financial Asset Originated | SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Past due	216	960
> 90 days | Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Past due	1,416	1,671
> 90 days | Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Past due	$ 25	$ 100

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Amount of financing receivable not past due.

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