Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]
Held to Maturity, Losses less than 12 months, Fair Value	$ 21,719	$ 352,931
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses	53	1,864
Held to Maturity, Losses 12 months or longer, Fair Value	2,179,763	2,035,771
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses	149,898	198,428
Held to Maturity, Total, Fair Value	2,201,482	2,388,702
Held to Maturity, Total, Gross Unrealized Losses	149,951	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	0	9,530
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses	0	63
Held to Maturity, Losses 12 months or longer, Fair Value	336,218	339,533
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses	34,673	43,908
Held to Maturity, Total, Fair Value	336,218	349,063
Held to Maturity, Total, Gross Unrealized Losses	34,673	43,971
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to Maturity, Losses less than 12 months, Fair Value	21,719	343,401
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses	53	1,801
Held to Maturity, Losses 12 months or longer, Fair Value	498,414	226,165
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses	15,202	17,792
Held to Maturity, Total, Fair Value	520,133	569,566
Held to Maturity, Total, Gross Unrealized Losses	15,255	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	549,890	595,039
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses	43,613	59,223
Held to Maturity, Total, Fair Value	549,890	595,039
Held to Maturity, Total, Gross Unrealized Losses	43,613	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	769,197	844,245
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses	55,404	75,803
Held to Maturity, Total, Fair Value	769,197	844,245
Held to Maturity, Total, Gross Unrealized Losses	55,404	75,803
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to Maturity, Losses 12 months or longer, Fair Value	26,044	30,789
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses	1,006	1,702
Held to Maturity, Total, Fair Value	26,044	30,789
Held to Maturity, Total, Gross Unrealized Losses	$ 1,006	$ 1,702