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Debt (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |
Maturity of federal funds purchased from correspondent banks |  | one business day |  |
Real estate secured loans |  | $ 1,337,974,000 |  |
Current borrowing available |  | 497,748,000 |  |
Maximum borrowing capacity |  | 933,422,000 |  |
Short term borrowings |  |  |  | $ 125,617,000
Long-term debt outstanding |  | 74,858,000 |  | 75,115,000
FHLB prepayment | $ 22,500,000 |  | $ 22,500,000 |
FHLB prepayment penalties | $ 26,000 |  | $ 165,000 |
FHLB [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Letter of credit outstanding, amount |  | 362,520,000 |  | 288,950,000
Paycheck Protection Program Liquidity Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short term borrowings |  | $ 0 |  | 125,617,000
Short-term borrowings, term |  | five years |  |
Short-term borrowings, interest Rate |  | 0.35% |  |
Other Correspondent Banks [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding drawings |  | $ 0 |  | 0
Line of credit facility, remaining borrowing capacity |  | 35,000,000 |  |
Short term borrowings |  | 0 |  | 0
FHLB Short-Term Borrowings [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding drawings |  | $ 0 |  | $ 0

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