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Loans and Allowance for Losses (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Charge-offs |  |  |  |  |  |  |  |  | $ 67,000 | $ 17,000 | $ 327,000
Change in total provision for losses |  |  |  |  |  |  |  |  | 3,200,000 | (1,400,000) |
Troubled debt restructurings, recorded investment | $ 38,500,000 |  |  |  |  |  |  |  | 38,500,000 |  |
Past due financing receivables | 60,954,000 |  |  |  | $ 26,881,000 |  |  |  | 60,954,000 | 26,881,000 |
Loans subject to removal-of-account provisions | 0 |  |  |  | 100,000 |  |  |  | 0 | 100,000 |
Provision for losses | 2,430,000 | $ 760,000 | $ 578,000 | $ (264,000) | 146,000 | $ 99,000 | $ 424,000 | $ (431,000) | 3,504,000 | 238,000 | 1,708,000
Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Charge-offs |  |  |  |  |  |  |  |  | 67,000 | 17,000 | 327,000
Provision for losses |  |  |  |  |  |  |  |  | 3,504,000 | 238,000 | 1,708,000
Reserve for Losses |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Charge-offs |  |  |  |  |  |  |  |  | 0 | 0 | $ 0
On-Balance Sheet: |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Past due financing receivables | $ 57,719,000 |  |  |  | $ 19,577,000 |  |  |  | $ 57,719,000 | $ 19,577,000 |

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