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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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