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Long-Term Borrowings and Subordinated Debt - Interest Expense and Weighted Average Interest Rates (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Disclosure [Abstract] |  |  |
Long-term borrowings | $ 23,681 | $ 50,868 | $ 70,314
Weighted average interest rate | 2.03% | 2.60% | 2.84%
Interest expense | $ 1,201 | $ 1,831 | $ 1,129

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