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Investment Securities - Textual (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Transfer of investment securities available for sale to held to maturity | $ 244,800,000 | $ 244,778,000 | $ 0 |
Debt Securities, Trading, and Equity Securities, FV-NI | 0 | 0 |  | $ 0
Investment securities held to maturity, at amortized cost, net (fair value of $307,330 and $0, respectively) | $ 311,074,000 | $ 311,074,000 |  | $ 0
Concentration, debt securities | 0.00% | 0.00% |  | 0.00%
Debt Securities, Available-for-sale, Allowance for Credit Loss | $ 0 | $ 0 |  | $ 0
Debt Securities, Held-to-maturity, 90 Days or More Past Due, Still Accruing | 0 | 0 |  |
Debt Securities, Held-to-maturity, Nonaccrual | 0 | 0 |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Held-to-Maturity, Accrued Interest, Writeoff |  | 0 | 0 |
Debt Securities, Available-for-Sale, Accrued Interest Writeoff |  | 0 | $ 0 |
Available-for-sale Securities |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accrued Investment Income Receivable | 3,000,000 | 3,000,000 |  | $ 3,600,000
Held-to-maturity Securities |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accrued Investment Income Receivable | 600,000 | $ 600,000 |  |
AOCI Attributable to Parent |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gain on transfer of securities from available for sale to held to maturity | $ 1,300,000 |  |  |

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