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Significant Accounting Policies (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) segment | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Significant Accounting Policies |  |  |  |
Number of operating segments | segment | 4 |  |  |
Percentage of commercial and industrial loans not secured by real estate | 21.70% | 23.90% |  |
Allowance for Credit Losses | $ 0 | $ 0 |  |
Permanent write-offs | 0 | 0 | $ 0 |
Permanent write-offs | $ 0 | 0 | 0 |
Period when accrual of interest on loans is discontinued when loans are past due | 90 days |  |  |
Unrecognized tax position pertaining to interest and penalties | $ 0 | 0 | 0 |
Retained earnings | (272,705,000) | (280,426,000) |  |
Allowance for credit losses on investments | 213,000 | 0 |  |
Allowance for credit losses | 35,843,000 | 31,146,000 | $ 31,572,000 | $ 34,246,000
Off balance sheet liability, Allowance for loan losses | $ 7,400,000 | 3,200,000 |  |
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Significant Accounting Policies |  |  |  |
Retained earnings |  | 4,500,000 |  |
Allowance for credit losses on investments |  | 172,000 |  |
Allowance for credit losses |  | 3,857,000 |  |
Off balance sheet liability, Allowance for loan losses |  | $ 1,900,000 |  |
Maximum |  |  |  |
Significant Accounting Policies |  |  |  |
Period when consumer loans are charged off when loans are past due | 120 days |  |  |

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