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Loans and Allowance for Losses - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs | $ 0 | $ 17,000 | $ 67,000 | $ 17,000 |
Provision for/(release of) losses | 760,000 | 99,000 | 1,074,000 | 92,000 |
Past due financing receivables | 59,691,000 |  | 59,691,000 |  | $ 26,881,000
Loans subject to removal-of-account provisions | 0 |  | 0 |  | 100,000
Troubled debt restructurings, recorded investment | 35,600,000 |  | 35,600,000 |  |
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs | 0 | 17,000 | 67,000 | 17,000 |
Provision for/(release of) losses | 760,000 | 99,000 | 1,074,000 | 92,000 |
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs | 0 | 0 | 0 | 0 |
Provision for/(release of) losses | (137,000) | $ (102,000) | (424,000) | $ 77,000 |
On-balance sheet [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past due financing receivables | $ 55,987,000 |  | $ 55,987,000 |  | $ 19,577,000

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