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Investment Securities - Textual (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Total investment securities	$ 384,822,000		$ 376,331,000
Debt Securities, Available-for-sale, Allowance for Credit Loss	0		0
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0
Debt Securities, Trading, and Equity Securities, FV-NI	0		$ 0
Debt Securities, Available-for-Sale, Accrued Interest Writeoff	0	$ 0
Debt Securities, Held-to-Maturity, Accrued Interest, Writeoff	$ 0	$ 0
Concentration, debt securities	0.00%		0.00%
Investment securities held to maturity, at amortized cost, net (fair value of $384,822 and $376,331, respectively)	$ 422,213,000		$ 383,393,000
Debt Securities, Held-to-maturity, Nonaccrual	0		0
Debt Securities, Held-to-maturity, 90 Days or More Past Due, Still Accruing	0		0
Total investment securities available for sale	1,039,924,000		894,335,000
Available-for-sale Securities [Member]
Accrued Investment Income Receivable	3,400,000		3,500,000
Held-to-maturity Securities
Accrued Investment Income Receivable	1,200,000		1,100,000
US Treasury and Government [Member]
Total investment securities	136,629,000		139,363,000
Investment securities held to maturity, at amortized cost, net (fair value of $384,822 and $376,331, respectively)	150,973,000		$ 141,011,000
US Treasury and Government [Member] | Level 2
Total investment securities available for sale	$ 39,555,000

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