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Loans and Allowance for Losses - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Provision for/(release of) losses | $ 578,000 | $ 424,000 | $ 314,000 | $ (7,000) |
Troubled debt restructurings, pre-modification |  | 0 |  | 0 |
Troubled debt restructurings, post-modification | 8,300,000 |  | 10,600,000 | 0 |
Past due financing receivables | 28,045,000 |  | 28,045,000 |  | $ 26,881,000
Loans subject to removal-of-account provisions | 100,000 |  | 100,000 |  | 100,000
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Provision for/(release of) losses | 578,000 | 424,000 | 314,000 | (7,000) |
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Provision for/(release of) losses | (158,000) | $ 158,000 | (287,000) | $ 179,000 |
On-balance sheet [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past due financing receivables | $ 20,812,000 |  | $ 20,812,000 |  | $ 19,577,000

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