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Investment Securities - Textuals (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Summary of Investment Holdings [Line Items]
Transfer of investment securities available for sale to held to maturity	$ 244,800,000	$ 244,778,000	$ 0	$ 0
Investment securities classified as trading	0	0	0
Investment securities classified as held to maturity	383,393,000	383,393,000	0
ACL on investment securities available for sale	0	0	0	0
Investment securities held to maturity classified as past due	0	0
Investment securities held to maturity classified as nonaccrual	0	0
ACL on investment securities held to maturity	0	0
Accrued interest receivable			3,600,000
Accrued interest write off on investment securities available for sale		0	0	0
Accrued interest write off on investment securities held to maturity		0	$ 0	$ 0
Held-to-maturity Securities
Summary of Investment Holdings [Line Items]
Accrued interest receivable	1,100,000	1,100,000
Available-for-sale Securities [Member]
Summary of Investment Holdings [Line Items]
Accrued interest receivable	3,500,000	$ 3,500,000
AOCI attributable to parent
Summary of Investment Holdings [Line Items]
Gain on transfer of investment securities available for sale to held to maturity	$ 1,300,000

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