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Loans and Allowance for Credit Losses on Loans - Aging of Past Due Loans by Class of Loans - Additional Information (Details) - USD ($) | Jun. 30, 2020 | Dec. 31, 2019
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Aging of Past Due Loans by Class of Loans |  |
Past due loans 30 day or greater | $ 11,504,000 | $ 15,315,000
Nonaccrual loans |  | 8,675,000
30 days or greater past due |  |
Aging of Past Due Loans by Class of Loans |  |
Nonaccrual loans | 2,844,000 | 7,413,000
Less than 30 days past due |  |
Aging of Past Due Loans by Class of Loans |  |
Nonaccrual loans | $ 5,613,000 |
Less than 30 days past due nonaccrual loans held-for-investment |  | $ 1,262,000

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