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Student Loans - Narrative (Details) | 3 Months Ended | 9 Months Ended |  |  |  |
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Sep. 30, 2021 USD ($) loan | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) loan | Sep. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) loan | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total Loans | $ 807,937,000 | $ 661,482,000 | $ 807,937,000 | $ 661,482,000 |  | $ 655,411,000 |  |
Accrued Interest | 8,246,000 |  | 8,246,000 |  |  | 8,164,000 |  |
Allowance for losses | 9,144,000 | 8,708,000 | 9,144,000 | 8,708,000 | $ 9,200,000 | 8,522,000 | $ 8,862,000 | $ 7,908,000
TDRs | 2,762,000 | 4,571,000 | 2,762,000 | 4,571,000 | $ 3,073,000 | 3,426,000 | $ 5,155,000 | $ 5,187,000
Accrued interest receivable, charged against interest income | (9,337,000) | (7,598,000) | (26,274,000) | (24,043,000) |  |  |  |
Student loan |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total Loans | 50,193,000 |  | 50,193,000 |  |  | 57,385,000 |  |
Accrued Interest | $ 5,487,000 |  | $ 5,487,000 |  |  | $ 4,974,000 |  |
Number of Loans | loan | 1,163 |  | 1,163 |  |  | 1,297 |  |
Allowance for losses | $ 2,597,000 |  | $ 2,597,000 |  |  | $ 2,546,000 |  |
TDRs | 0 |  | 0 |  |  | 0 |  |
Accrued interest receivable, charged against interest income | (54,000) | (9,000) | (97,000) | (59,000) |  |  |  |
Charge-off of loans | 530,000 | $ 174,000 | 1,183,000 | $ 1,121,000 |  |  |  |
Student loan | Special mention |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total Loans | $ 318,000 |  | $ 318,000 |  |  | $ 513,000 |  |
Student loan | Repayment, Deferment, and Forbearance |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Number of Loans | loan | 870 |  | 870 |  |  | 944 |  |
Student loan | School |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total Loans | $ 6,551,000 |  | $ 6,551,000 |  |  | $ 12,905,000 |  |
Accrued Interest | $ 1,918,000 |  | $ 1,918,000 |  |  | $ 3,201,000 |  |
Number of Loans | loan | 185 |  | 185 |  |  | 319 |  |
Student loan | Grace |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total Loans | $ 5,076,000 |  | $ 5,076,000 |  |  | $ 988,000 |  |
Accrued Interest | $ 1,479,000 |  | $ 1,479,000 |  |  | $ 719,000 |  |
Number of Loans | loan | 108 |  | 108 |  |  | 34 |  |
Student loan | Repayment |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total Loans | $ 20,782,000 |  | $ 20,782,000 |  |  | $ 28,906,000 |  |
Accrued Interest | $ 549,000 |  | $ 549,000 |  |  | $ 292,000 |  |
Number of Loans | loan | 459 |  | 459 |  |  | 623 |  |
Student loan | Deferment |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total Loans | $ 9,285,000 |  | $ 9,285,000 |  |  | $ 7,407,000 |  |
Accrued Interest | $ 1,025,000 |  | $ 1,025,000 |  |  | $ 209,000 |  |
Number of Loans | loan | 232 |  | 232 |  |  | 187 |  |
Student loan | Forbearance |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total Loans | $ 8,499,000 |  | $ 8,499,000 |  |  | $ 7,179,000 |  |
Accrued Interest | $ 516,000 |  | $ 516,000 |  |  | $ 553,000 |  |
Number of Loans | loan | 179 |  | 179 |  |  | 134 |  |

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