Debt Securities Available for Sale - Narrative (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) security	Dec. 31, 2020 USD ($) security	Dec. 31, 2019 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Mortgage-backed securities and collateralized mortgage obligations, amortized cost	$ 1,553,491,000
Mortgage-backed securities and collateralized mortgage obligations, fair value	1,554,359,000
Proceeds from sales of debt securities available for sale	90,339,000	$ 20,761,000	$ 65,198,000
Debt securities, available-for-sale securities, gross realized gains	2,100,000	369,000	2,200,000
Debt securities, available-for-sale, realized loss	439,000	0	22,000
Proceeds from calls and maturities of debt securities, available-for-sale	14,000,000	11,600,000	24,100,000
Debt securities, available-for-sale, realized gain (loss)	0
Proceeds from sale and maturity of debt securities, available for sale	210,000	10,900,000	797,000
Calls of debt securities, available-for-sale, realized gain		1,000	174,000
Calls of debt securities, available-for-sale, unrealized loss		0	$ 0
Debt securities, available-for-sale, number of matured debt securities | security			1
Debt securities, available-for-sale, restricted	$ 587,700,000	$ 822,200,000
Number of unrealized loss positions | security	219	40
Other-than-temporary impairment loss, debt securities, available for sale	$ 0	$ 0	$ 0
Subsidiaries
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, restricted	$ 44,100,000