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Debt (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |
Maturity of federal funds purchased from correspondent banks | one business day |  |
Real estate secured loans | $ 1,302,960,000 |  |
Current borrowing available | 571,837,000 |  |
Maximum borrowing capacity | 908,918,000 |  |
Short term borrowings | 307,753,000 |  | $ 125,617,000
Long-term debt outstanding | 75,030,000 |  | 75,115,000
FHLB prepayment |  | $ 9,500,000 |
FHLB prepayment penalties |  | $ 63,000 |
FHLB [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Letter of credit outstanding, amount | 263,800,000 |  | 288,950,000
Paycheck Protection Program Liquidity Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Short term borrowings | $ 307,753,000 |  | 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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