Investment Securities (Contractual Maturities of Investment Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Available-for-sale securities
Due in one year or less, amortized cost	$ 119,830	$ 49,714
Due in one to five years, amortized cost	63,644	72,382
Due in five to ten years, amortized cost	115,734	118,358
Due after ten years, amortized cost	64,590	69,200
Amortized Cost	3,769,634	2,316,369
Due in one year or less, fair value	119,275	49,822
Due in one to five years, fair value	61,701	73,850
Due in five to ten years, fair value	105,076	117,573
Due after ten years, fair value	57,478	72,560
Fair Value	3,243,017	2,327,793
Held-to-maturity securities
Held-to-maturity securities, due in one year or less, amortized cost	1,340	2,976
Held-to-maturity securities, due in one to five years, amortized cost	94,705	79,422
Held-to-maturity securities, due in five to ten years, amortized cost	115,318	106,713
Held-to-maturity securities, due after ten years, amortized cost	365,510	222,522
Amortized Cost	3,641,055	2,942,363
Less: Allowance for credit losses	(488)	(78)
Held-to-maturity securities, net of allowance for credit losses	3,640,567	2,942,285
Held-to-maturity securities, due in one year or less, fair value	1,332	2,992
Held-to-maturity securities, due in one to five years, fair value	89,093	79,705
Held-to-maturity securities, due in five to ten years, fair value	113,758	112,667
Held-to-maturity securities, due after ten years, fair value	288,460	221,358
Fair Value	2,949,821	2,900,694
Mortgage-backed
Available-for-sale securities
Mortgage-backed, without single maturity date, amortized cost	3,405,836	2,006,715
Mortgage-backed, without single maturity date, fair value	2,899,487	2,013,988
Held-to-maturity securities
Mortgage-backed, amortized cost	3,064,182	2,530,730
Mortgage-backed, fair value	$ 2,457,178	$ 2,483,972