Investment Securities - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Debt securities at fair value	$ 827,215,000		$ 827,215,000		$ 956,430,000
Accrued interest related to AFS debt securities	4,400,000		4,400,000		3,200,000
Callable debt securities, fair value	159,000,000		159,000,000
Sale of debt securities	0	$ 0	32,715,000	$ 3,059,000
Equity securities at fair value	3,815,000		3,815,000		1,785,000
Collateral Pledged
Debt Securities, Available-for-sale [Line Items]
Debt securities, pledged as collateral	$ 813,000,000		$ 813,000,000		$ 949,300,000