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Loans and Allowance for Credit Losses - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Recorded Investment |  |
Total | $ 109,239 |
Unpaid Principal Balance |  |
Total | 110,353 |
Related Allowance | 8,991 |
Average Recorded Investment |  |
Total | 116,818 | $ 111,359
Commercial |  |
Recorded Investment |  |
With no related allowance recorded | 23,227 |
With related allowance recorded | 18,252 |
Unpaid Principal Balance |  |
With no related allowance recorded | 23,665 |
With related allowance recorded | 18,305 |
Related Allowance | 7,891 |
Average Recorded Investment |  |
With no related allowance recorded | 22,629 | 21,295
With an allowance recorded recorded | 15,816 | 9,546
Commercial real estate |  |
Recorded Investment |  |
With related allowance recorded | 12,685 |
Unpaid Principal Balance |  |
With related allowance recorded | 12,685 |
Related Allowance | 1,006 |
Commercial real estate | Commercial Real Estate - Construction |  |
Recorded Investment |  |
With no related allowance recorded | 12,929 |
Unpaid Principal Balance |  |
With no related allowance recorded | 12,929 |
Average Recorded Investment |  |
With no related allowance recorded | 6,465 | 0
With an allowance recorded recorded | 6,912 | 7,365
Commercial real estate | Commercial Real Estate - Other |  |
Recorded Investment |  |
With no related allowance recorded | 37,674 |
Unpaid Principal Balance |  |
With no related allowance recorded | 38,112 |
Average Recorded Investment |  |
With no related allowance recorded | 39,401 | 39,902
With an allowance recorded recorded | 20,420 | 27,317
Residential real estate |  |
Recorded Investment |  |
With no related allowance recorded | 1,774 |
With related allowance recorded | 1,201 |
Unpaid Principal Balance |  |
With no related allowance recorded | 1,794 |
With related allowance recorded | 1,201 |
Related Allowance | 39 |
Average Recorded Investment |  |
With no related allowance recorded | 2,052 | 2,305
With an allowance recorded recorded | 981 | 840
Consumer |  |
Recorded Investment |  |
With no related allowance recorded | 403 |
With related allowance recorded | 1,094 |
Unpaid Principal Balance |  |
With no related allowance recorded | 568 |
With related allowance recorded | 1,094 |
Related Allowance | 55 |
Average Recorded Investment |  |
With no related allowance recorded | 923 | 832
With an allowance recorded recorded | $ 1,219 | $ 1,957

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