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Securities - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2013
Investment [Line Items]
Available-for-sale securities transferred to held-to-maturity securities	$ 12,700,000		$ 536,000,000
Unrealized net loss on securities reclassified from available-for-sale to held-to-maturity, Gross	209,000		$ 13,300,000
Debt securities, available-for-sale, realized gain (loss)	0	$ 476,000
Available-for-sale, amortized cost	569,874,000	180,154,000
Available-for-sale, fair value	568,255,000	183,302,000
Estimated fair value of securities pledged for deposits and other purposes	1,140,000,000	435,900,000
Equity investments	101,155,000	107,079,000
Corporate debt securities
Investment [Line Items]
Available-for-sale, amortized cost	66,200,000
Available-for-sale, fair value	66,400,000
Corporate debt securities | Investment securities
Investment [Line Items]
Available-for-sale, amortized cost	5,000,000
Available-for-sale, fair value	5,031,000
State, municipal, and sovereign debt obligations
Investment [Line Items]
Available-for-sale, amortized cost	90,200,000
Available-for-sale, fair value	92,500,000
Asset-backed securities | Investment securities
Investment [Line Items]
Available-for-sale, amortized cost	298,976,000	6,174,000
Available-for-sale, fair value	297,528,000	6,170,000
Reverse Repurchase Agreements
Investment [Line Items]
Estimated fair value of securities pledged for reverse repurchase agreements	$ 142,900,000	$ 152,700,000

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Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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