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Allowance for Credit Losses - Troubled Debt Restructurings (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) investmentSecurity	Jun. 30, 2021 USD ($) investmentSecurity	Jun. 30, 2022 USD ($) investmentSecurity	Jun. 30, 2021 USD ($) investmentSecurity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) | investmentSecurity	0	3,000	3	8,000
Pre-mod outstanding principal balance	$ 0	$ 2,706	$ 1,228	$ 4,079
Post-mod outstanding principal balance	0	2,706	1,440	4,070
Financial impact due to TDR taken as additional provision	$ 0	$ 999	$ 0	$ 2,365
Number that defaulted during the period (in investment securities) | investmentSecurity	3,000	0	4,000	4,000
Recorded investment of TDRs that defaulted during the period	$ 168	$ 0	$ 253	$ 1,094
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 (in investment securities) | investmentSecurity	0	1,000	3	3,000
Pre-mod outstanding principal balance	$ 0	$ 706	$ 1,228	$ 1,763
Post-mod outstanding principal balance	0	706	1,440	1,760
Financial impact due to TDR taken as additional provision	$ 0	$ 706	$ 0	$ 1,762
Number that defaulted during the period (in investment securities) | investmentSecurity	0	0	0	3,000
Recorded investment of TDRs that defaulted during the period	$ 0	$ 0	$ 0	$ 847
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 (in investment securities) | investmentSecurity	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 (in investment securities) | investmentSecurity	2,000	0	3,000	0
Recorded investment of TDRs that defaulted during the period	$ 146	$ 0	$ 231	$ 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 (in investment securities) | investmentSecurity	0	2,000	0	5,000
Pre-mod outstanding principal balance	$ 0	$ 2,000	$ 0	$ 2,316
Post-mod outstanding principal balance	0	2,000	0	2,310
Financial impact due to TDR taken as additional provision	$ 0	$ 293	$ 0	$ 603
Number that defaulted during the period (in investment securities) | investmentSecurity	1,000	0	1,000	1,000
Recorded investment of TDRs that defaulted during the period	$ 22	$ 0	$ 22	$ 247
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 (in investment securities) | investmentSecurity	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 (in investment securities) | investmentSecurity	0	0	0	0
Recorded investment of TDRs 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 (in investment securities) | investmentSecurity	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 (in investment securities) | investmentSecurity	0	0	0	0
Recorded investment of TDRs 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
Leases
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) | investmentSecurity	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 (in investment securities) | investmentSecurity	0	0	0	0
Recorded investment of TDRs 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
CRE non-owner occupied | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) | investmentSecurity	0	1,000	0	2,000
Pre-mod outstanding principal balance	$ 0	$ 706	$ 0	$ 1,023
Post-mod outstanding principal balance	0	706	0	1,018
Financial impact due to TDR taken as additional provision	$ 0	$ 706	$ 0	$ 1,020
Number that defaulted during the period (in investment securities) | investmentSecurity	0	0	0	0
Recorded investment of TDRs 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
CRE owner occupied | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) | investmentSecurity	0	0	0	1,000
Pre-mod outstanding principal balance	$ 0	$ 0	$ 0	$ 740
Post-mod outstanding principal balance	0	0	0	742
Financial impact due to TDR taken as additional provision	$ 0	$ 0	$ 0	$ 742
Number that defaulted during the period (in investment securities) | investmentSecurity	0	0	0	0
Recorded investment of TDRs 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
Multifamily | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) | investmentSecurity	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 (in investment securities) | investmentSecurity	0	0	0	0
Recorded investment of TDRs 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 (in investment securities) | investmentSecurity	0	0	3	0
Pre-mod outstanding principal balance	$ 0	$ 0	$ 1,228	$ 0
Post-mod outstanding principal balance	0	0	1,440	0
Financial impact due to TDR taken as additional provision	$ 0	$ 0	$ 0	$ 0
Number that defaulted during the period (in investment securities) | investmentSecurity	0	0	0	3,000
Recorded investment of TDRs that defaulted during the period	$ 0	$ 0	$ 0	$ 847
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 (in investment securities) | investmentSecurity	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 (in investment securities) | investmentSecurity	0	0	0	0
Recorded investment of TDRs 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 HELOCs and junior liens | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number (in investment securities) | investmentSecurity	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 (in investment securities) | investmentSecurity	2,000	0	3,000	0
Recorded investment of TDRs that defaulted during the period	$ 146	$ 0	$ 231	$ 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 (in investment securities) | investmentSecurity	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 (in investment securities) | investmentSecurity	0	0	0	0
Recorded investment of TDRs 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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