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Allowance for Credit Losses on Loans - Troubled Debt Restructurings (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) investment_security	Sep. 30, 2019 USD ($) investment_security	Sep. 30, 2020 USD ($) investment_security	Sep. 30, 2019 USD ($) investment_security
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | investment_security	6,000	8,000	12	18,000
Pre-mod outstanding principal balance	$ 2,741	$ 706	$ 3,420	$ 2,851
Post-mod outstanding principal balance	2,655	715	3,393	2,829
Financial impact due to TDR taken as additional provision	$ 381	$ 28	$ 402	$ 59
Number that defaulted during the period | investment_security	4,000	0	5	1
Recorded investment of TDR's that defaulted during the period	$ 1,685	$ 0	$ 2,579	$ 7
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	$ 0	$ 0	$ 0	$ 0
Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | investment_security	6,000	2,000	9	2,000
Pre-mod outstanding principal balance	$ 2,741	$ 60	$ 3,227	$ 60
Post-mod outstanding principal balance	2,655	67	3,204	67
Financial impact due to TDR taken as additional provision	$ 381	$ 0	$ 381	$ 0
Number that defaulted during the period | investment_security	3,000	0	3	0
Recorded investment of TDR's that defaulted during the period	$ 1,542	$ 0	$ 1,542	$ 0
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	$ 0	$ 0	$ 0	$ 0
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | investment_security	0	2,000	2	6,000
Pre-mod outstanding principal balance	$ 0	$ 496	$ 172	$ 873
Post-mod outstanding principal balance	0	500	169	877
Financial impact due to TDR taken as additional provision	$ 0	$ 28	$ 0	$ 59
Number that defaulted during the period | investment_security	1,000		2	0
Recorded investment of TDR's that defaulted during the period	$ 143		$ 1,037	$ 0
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	$ 0	$ 0	$ 0	$ 0
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | investment_security	0	4,000	0	10,000
Pre-mod outstanding principal balance	$ 0	$ 150	$ 0	$ 1,918
Post-mod outstanding principal balance	0	148	0	1,885
Financial impact due to TDR taken as additional provision	$ 0	$ 0	$ 0	$ 0
Number that defaulted during the period | investment_security	0	0	0	1
Recorded investment of TDR's that defaulted during the period	$ 0	$ 0	$ 0	$ 7
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	$ 0	$ 0	$ 0	$ 0
Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | investment_security	0	0	1	0
Pre-mod outstanding principal balance	$ 0	$ 0	$ 21	$ 0
Post-mod outstanding principal balance	0	0	20	0
Financial impact due to TDR taken as additional provision	$ 0	$ 0	$ 21	$ 0
Number that defaulted during the period | investment_security	0	0	0	0
Recorded investment of TDR's that defaulted during the period	$ 0	$ 0	$ 0	$ 0
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	$ 0	$ 0	$ 0	$ 0
Agriculture production
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | investment_security	0	0
Pre-mod outstanding principal balance	$ 0	$ 0
Post-mod outstanding principal balance	0	0
Financial impact due to TDR taken as additional provision	$ 0	$ 0
Number that defaulted during the period | investment_security	0	0
Recorded investment of TDR's that defaulted during the period	$ 0	$ 0
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	$ 0	$ 0
Leases
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | investment_security	0	0
Pre-mod outstanding principal balance	$ 0	$ 0
Post-mod outstanding principal balance	0	0
Financial impact due to TDR taken as additional provision	$ 0	$ 0
Number that defaulted during the period | investment_security	0	0
Recorded investment of TDR's that defaulted during the period	$ 0	$ 0
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	$ 0	$ 0
CRE non-owner occupied | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | investment_security	1,000	2,000	2	2,000
Pre-mod outstanding principal balance	$ 319	$ 60	$ 576	$ 60
Post-mod outstanding principal balance	314	67	565	67
Financial impact due to TDR taken as additional provision	$ 314	$ 0	$ 314	$ 0
Number that defaulted during the period | investment_security	1,000	0	1	0
Recorded investment of TDR's that defaulted during the period	$ 141	$ 0	$ 141	$ 0
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	$ 0	$ 0	$ 0	$ 0
CRE owner occupied | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | investment_security	5,000	0	5	0
Pre-mod outstanding principal balance	$ 2,422	$ 0	$ 2,422	$ 0
Post-mod outstanding principal balance	2,341	0	2,341	0
Financial impact due to TDR taken as additional provision	$ 67	$ 0	$ 67	$ 0
Number that defaulted during the period | investment_security	2,000	0	2	0
Recorded investment of TDR's that defaulted during the period	$ 1,401	$ 0	$ 1,401	$ 0
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	$ 0	$ 0	$ 0	$ 0
Multifamily | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | investment_security	0	0	0	0
Pre-mod outstanding principal balance	$ 0	$ 0	$ 0	$ 0
Post-mod outstanding principal balance	0	0	0	0
Financial impact due to TDR taken as additional provision	$ 0	$ 0	$ 0	$ 0
Number that defaulted during the period | investment_security	0	0	0	0
Recorded investment of TDR's that defaulted during the period	$ 0	$ 0	$ 0	$ 0
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	$ 0	$ 0	$ 0	$ 0
Farmland | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | investment_security	0	0	2	0
Pre-mod outstanding principal balance	$ 0	$ 0	$ 229	$ 0
Post-mod outstanding principal balance	0	0	298	0
Financial impact due to TDR taken as additional provision	$ 0	$ 0	$ 0	$ 0
Number that defaulted during the period | investment_security	0	0	0	0
Recorded investment of TDR's that defaulted during the period	$ 0	$ 0	$ 0	$ 0
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	$ 0	$ 0	$ 0	$ 0
SFR 1-4 1st DT Liens | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | investment_security	0	2,000	0	3,000
Pre-mod outstanding principal balance	$ 0	$ 496	$ 0	$ 659
Post-mod outstanding principal balance	0	500	0	662
Financial impact due to TDR taken as additional provision	$ 0	$ 28	$ 0	$ 30
Number that defaulted during the period | investment_security	0	0	2	0
Recorded investment of TDR's that defaulted during the period	$ 0	$ 0	$ 1,037	$ 0
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	$ 0	$ 0	$ 0	$ 0
SFR HELOCs and junior liens | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | investment_security	0	0	2	3,000
Pre-mod outstanding principal balance	$ 0	$ 0	$ 172	$ 214
Post-mod outstanding principal balance	0	0	169	215
Financial impact due to TDR taken as additional provision	$ 0	$ 0	$ 0	$ 29
Number that defaulted during the period | investment_security	1,000	0	0	0
Recorded investment of TDR's that defaulted during the period	$ 143	$ 0	$ 0	$ 0
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	$ 0	$ 0	$ 0	$ 0
Other | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | investment_security	0	0	0	0
Pre-mod outstanding principal balance	$ 0	$ 0	$ 0	$ 0
Post-mod outstanding principal balance	0	0	0	0
Financial impact due to TDR taken as additional provision	$ 0	$ 0	$ 0	$ 0
Number that defaulted during the period | investment_security	0	0	0	0
Recorded investment of TDR's that defaulted during the period	$ 0	$ 0	$ 0	$ 0
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions	$ 0	$ 0	$ 0	$ 0

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