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Subordinated Debentures (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Jan. 31, 2018 | Jun. 30, 2015 | Sep. 30, 2021 | Dec. 31, 2020
Subordinated Debt from Trust [Member] |  |  |  |  |
Subordinated Debentures (Details) [Line Items] |  |  |  |  |
Value of subordinated debentures received by Trust |  |  |  | $ 5.0 |
Percentage Rate Added to Libor |  |  |  | 2.85% |
Floating interest rate on subordinated debentures |  |  |  | 2.98% |
Proceeds from Issuance of Debt |  |  |  | $ 5.2 |
Debt Instrument, Maturity Date |  |  |  | Jan. 23, 2034 |
Fixed-to-floating Rate Subordinated 2020 Notes [Member] |  |  |  |  |
Subordinated Debentures (Details) [Line Items] |  |  |  |  |
Proceeds from Issuance of Debt | $ 75.0 |  |  |  |
Debt Instrument, Maturity Date | Sep. 15, 2025 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.75% |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  | Three-Month Term SOFR (as defined in the Second Supplemental Indenture), plus 560.5 basis points |
Fixed-to-floating Rate Subordinated 2018 Notes [Member] |  |  |  |  |
Subordinated Debentures (Details) [Line Items] |  |  |  |  |
Proceeds from Issuance of Debt |  | $ 75.0 |  |  |
Debt Instrument, Maturity Date |  | Feb. 01, 2028 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.20% |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  | three-month LIBOR rate plus 284 basis points |
Bank [Member] |  |  |  |  |
Subordinated Debentures (Details) [Line Items] |  |  |  |  |
Proceeds from Issuance of Debt |  | $ 65.0 |  |  |
Fixed-to-floating Rate Subordinated Notes [Member] |  |  |  |  |
Subordinated Debentures (Details) [Line Items] |  |  |  |  |
Proceeds from Issuance of Debt |  |  | $ 50.0 |  |
Debt Instrument, Maturity Date |  |  |  |  | Jul. 01, 2025
Debt Instrument, Description of Variable Rate Basis |  |  |  | three-month LIBOR rate plus 393 basis points |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 4.16%

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