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Allowance for Credit Losses - Troubled Debt Restructurings (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) investmentSecurity	Mar. 31, 2020 USD ($) investmentSecurity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) | investmentSecurity	5,000	6,000
Pre-mod outstanding principal balance	$ 1,373	$ 680
Post-mod outstanding principal balance	1,366	738
Financial impact due to TDR taken as additional provision	$ 1,366	$ 21
Number that defaulted during the period (in investment securities) | investmentSecurity	4,000	1,000
Recorded investment of TDRs that defaulted during the period	$ 1,094	$ 302
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0	$ 0
Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) | investmentSecurity	2,000	3,000
Pre-mod outstanding principal balance	$ 1,057	$ 487
Post-mod outstanding principal balance	1,056	549
Financial impact due to TDR taken as additional provision	$ 1,056	$ 0
Number that defaulted during the period (in investment securities) | investmentSecurity	3,000	0
Recorded investment of TDRs that defaulted during the period	$ 847	$ 0
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0	$ 0
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) | investmentSecurity	0	2,000
Pre-mod outstanding principal balance	$ 0	$ 172
Post-mod outstanding principal balance	0	169
Financial impact due to TDR taken as additional provision	$ 0	$ 0
Number that defaulted during the period (in investment securities) | investmentSecurity	0	1,000
Recorded investment of TDRs that defaulted during the period	$ 0	$ 302
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0	$ 0
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) | investmentSecurity	3,000	1,000
Pre-mod outstanding principal balance	$ 316	$ 21
Post-mod outstanding principal balance	310	20
Financial impact due to TDR taken as additional provision	$ 310	$ 21
Number that defaulted during the period (in investment securities) | investmentSecurity	1,000	0
Recorded investment of TDRs that defaulted during the period	$ 247	$ 0
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0	$ 0
Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) | investmentSecurity	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 (in investment securities) | investmentSecurity	0	0
Recorded investment of TDRs 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
Agriculture production
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) | investmentSecurity	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 (in investment securities) | investmentSecurity	0	0
Recorded investment of TDRs 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 (in investment securities) | investmentSecurity	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 (in investment securities) | investmentSecurity	0	0
Recorded investment of TDRs 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 (in investment securities) | investmentSecurity	1,000	1,000
Pre-mod outstanding principal balance	$ 317	$ 257
Post-mod outstanding principal balance	314	251
Financial impact due to TDR taken as additional provision	$ 314	$ 0
Number that defaulted during the period (in investment securities) | investmentSecurity	0	0
Recorded investment of TDRs 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 owner occupied | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) | investmentSecurity	1,000	0
Pre-mod outstanding principal balance	$ 740	$ 0
Post-mod outstanding principal balance	742	0
Financial impact due to TDR taken as additional provision	$ 742	$ 0
Number that defaulted during the period (in investment securities) | investmentSecurity	0	0
Recorded investment of TDRs 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
Multifamily | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) | investmentSecurity	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 (in investment securities) | investmentSecurity	0	0
Recorded investment of TDRs 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
Farmland | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) | investmentSecurity	0	2,000
Pre-mod outstanding principal balance	$ 0	$ 230
Post-mod outstanding principal balance	0	298
Financial impact due to TDR taken as additional provision	$ 0	$ 0
Number that defaulted during the period (in investment securities) | investmentSecurity	3,000	0
Recorded investment of TDRs that defaulted during the period	$ 847	$ 0
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0	$ 0
SFR 1-4 1st DT liens | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) | investmentSecurity	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 (in investment securities) | investmentSecurity	0	1,000
Recorded investment of TDRs that defaulted during the period	$ 0	$ 302
Financial impact due to the default of previous TDR taken as charge- offs or additional provisions	$ 0	$ 0
SFR HELOCs and junior liens | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) | investmentSecurity	0	2,000
Pre-mod outstanding principal balance	$ 0	$ 172
Post-mod outstanding principal balance	0	169
Financial impact due to TDR taken as additional provision	$ 0	$ 0
Number that defaulted during the period (in investment securities) | investmentSecurity	0	0
Recorded investment of TDRs 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
Other | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) | investmentSecurity	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 (in investment securities) | investmentSecurity	0	0
Recorded investment of TDRs 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

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