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Credit Quality and Nonperforming Assets - Purchased Credit Impaired Loans - Tabular Disclosure (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Impaired Financing Receivable, Unpaid Principal Balance, Total | $ 17,099 | $ 15,815
Impaired Financing Receivable, Carrying Value, Total | 15,539 | $ 14,152
Purchased Credit Impaired Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Financing Receivable, Unpaid Principal Balance, Total | 86 |
Impaired Financing Receivable, Carrying Value, Total | 86 |
Real Estate [Member] | Purchased Credit Impaired Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Financing Receivable, Unpaid Principal Balance, Total | 86 |
Impaired Financing Receivable, Carrying Value, Total | $ 86 |

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