Investment Securities - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Marketable Securities [Line Items]
Security Owned and Pledged as Collateral Carrying Value	$ 636,200,000		$ 636,200,000		$ 759,800,000
Realized available-for-sale securities gains (losses)	0	$ 0	27,000	$ 0
Preferred and common stock held as investment securities	5,860,000		5,860,000		7,832,000
Realized gain (loss) on equity securities	256,000	$ 43,000	$ (1,100,000)	$ (1,800,000)
Minimum [Member]
Marketable Securities [Line Items]
Loss Rate Percent			3.00%
Preferred and Common Stock [Member]
Marketable Securities [Line Items]
Preferred and common stock held as investment securities	$ 5,900,000		$ 5,900,000		$ 7,800,000