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Investment Securities - Textuals (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Summary of Investment Holdings [Line Items]
Transfer of investment securities available for sale to held to maturity	$ 244,800,000	$ 0	$ 244,778,000	$ 0
Investment securities classified as trading	0	0	0
Investment securities classified as held to maturity	383,393,000	766,396,000	383,393,000
ACL on investment securities available for sale	$ 0	0	0
Investment securities held to maturity classified as past due		0
Investment securities held to maturity classified as nonaccrual		0
ACL on investment securities held to maturity		0
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
Common Stock, Shares, Outstanding	35,105,779	35,106,697	35,105,779
Net Change Interest-Bearing Domestic Deposits, Money Market		$ (56,931,000)
Common Class B
Summary of Investment Holdings [Line Items]
Common Stock, Shares, Outstanding		6,549
Common Stock, Value, Outstanding		$ 0
Held-to-maturity Securities
Summary of Investment Holdings [Line Items]
Accrued interest receivable	$ 1,100,000	2,400,000	$ 1,100,000
Available-for-sale Securities [Member]
Summary of Investment Holdings [Line Items]
Accrued interest receivable	$ 3,500,000	$ 4,800,000	$ 3,500,000

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