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Allowance for Credit Losses on Loans - Schedule of Non Accrual Loans (Detail) - Financial Asset Originated - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Non accrual with no allowance for credit losses | $ 19,300 | $ 13,909
Non accrual, no allowance including guaranteed loans | 20,114 | 14,825
Non accrual including guaranteed loans | 22,918 | 16,845
Total non accrual | 22,104 | 15,855
Loans Insured or Guaranteed by US Government Authorities |  |
Financing Receivable, Past Due [Line Items] |  |
Non accrual with no allowance for credit losses | 814 | 916
Total non accrual | 814 | 990
Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past due 90 days or more and still accruing | 45 | 19
Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Non accrual with no allowance for credit losses | 8,844 | 5,316
Total non accrual | 8,844 | 5,316
Commercial real estate | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past due 90 days or more and still accruing | 0 | 0
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Non accrual with no allowance for credit losses | 10,236 | 9,019
Total non accrual | 11,792 | 9,441
Consumer | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past due 90 days or more and still accruing | 29 | 19
Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Non accrual with no allowance for credit losses | 761 | 476
Total non accrual | 1,978 | 2,050
Commercial and industrial | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past due 90 days or more and still accruing | 16 | 0
Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Non accrual with no allowance for credit losses | 0 | 0
Total non accrual | 18 | 0
Construction | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past due 90 days or more and still accruing | 0 | 0
Agriculture production |  |
Financing Receivable, Past Due [Line Items] |  |
Non accrual with no allowance for credit losses | 273 | 14
Total non accrual | 286 | 38
Agriculture production | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past due 90 days or more and still accruing | 0 | 0
Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Non accrual with no allowance for credit losses | 0 |
Total non accrual | 0 |
Leases | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past due 90 days or more and still accruing | 0 | 0
CRE non-owner occupied | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Non accrual with no allowance for credit losses | 3,010 | 639
Total non accrual | 3,010 | 642
CRE non-owner occupied | Commercial real estate | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past due 90 days or more and still accruing | 0 | 0
CRE owner occupied | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Non accrual with no allowance for credit losses | 3,778 | 1,411
Total non accrual | 3,778 | 1,408
CRE owner occupied | Commercial real estate | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past due 90 days or more and still accruing | 0 | 0
Multifamily | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Non accrual with no allowance for credit losses | 0 | 2,024
Total non accrual | 0 | 2,024
Multifamily | Commercial real estate | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past due 90 days or more and still accruing | 0 | 0
Farmland | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Non accrual with no allowance for credit losses | 2,056 | 1,242
Total non accrual | 2,056 | 1,242
Farmland | Commercial real estate | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past due 90 days or more and still accruing | 0 | 0
SFR 1-4 1st DT Liens | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Non accrual with no allowance for credit losses | 6,182 | 5,023
Total non accrual | 6,351 | 5,192
SFR 1-4 1st DT Liens | Consumer | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past due 90 days or more and still accruing | 0 | 0
SFR HELOCs and junior liens | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Non accrual with no allowance for credit losses | 3,974 | 3,992
Total non accrual | 5,184 | 4,217
SFR HELOCs and junior liens | Consumer | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past due 90 days or more and still accruing | 0 | 0
Other | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Non accrual with no allowance for credit losses | 80 | 4
Total non accrual | 257 | 32
Other | Consumer | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past due 90 days or more and still accruing | $ 29 | $ 19

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