Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair value	$ 100,694	$ 352,931
Held to maturity, Losses less than 12 months, Gross unrealized losses	811	1,864
Held to maturity, Losses 12 months or longer, Fair value	2,313,431	2,035,771
Held to maturity, Losses 12 months or longer, Gross unrealized losses	217,077	198,428
Held to maturity, Total, Fair value	2,414,125	2,388,702
Held to maturity, Total, Gross unrealized losses	217,888	200,292
U.S. Treasury And Government Agency Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair value	29,579	9,530
Held to maturity, Losses less than 12 months, Gross unrealized losses	316	63
Held to maturity, Losses 12 months or longer, Fair value	331,773	339,533
Held to maturity, Losses 12 months or longer, Gross unrealized losses	47,767	43,908
Held to maturity, Total, Fair value	361,352	349,063
Held to maturity, Total, Gross unrealized losses	48,083	43,971
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair value	71,115	343,401
Held to maturity, Losses less than 12 months, Gross unrealized losses	495	1,801
Held to maturity, Losses 12 months or longer, Fair value	544,326	226,165
Held to maturity, Losses 12 months or longer, Gross unrealized losses	22,690	17,792
Held to maturity, Total, Fair value	615,441	569,566
Held to maturity, Total, Gross unrealized losses	23,185	19,593
Residential Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses 12 months or longer, Fair value	571,669	595,039
Held to maturity, Losses 12 months or longer, Gross unrealized losses	64,540	59,223
Held to maturity, Total, Fair value	571,669	595,039
Held to maturity, Total, Gross unrealized losses	64,540	59,223
Commercial Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses 12 months or longer, Fair value	836,727	844,245
Held to maturity, Losses 12 months or longer, Gross unrealized losses	80,280	75,803
Held to maturity, Total, Fair value	836,727	844,245
Held to maturity, Total, Gross unrealized losses	80,280	75,803
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses 12 months or longer, Fair value	28,936	30,789
Held to maturity, Losses 12 months or longer, Gross unrealized losses	1,800	1,702
Held to maturity, Total, Fair value	28,936	30,789
Held to maturity, Total, Gross unrealized losses	$ 1,800	$ 1,702