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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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