Securities (Amortized Cost and Fair Value of Debt Securities Held to Maturity) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	$ 2,473,633	$ 2,684,779
Securities Held to Maturity, Gross Unrealized Gains	1,576	1,431
Securities Held to Maturity, Gross Unrealized Losses	149,951	200,292
Securities Held to Maturity, Fair Value	2,325,258	2,485,918
U.S. Treasury And Government Agency Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	400,115	413,490
Securities Held to Maturity, Gross Unrealized Gains	661	179
Securities Held to Maturity, Gross Unrealized Losses	34,673	43,971
Securities Held to Maturity, Fair Value	366,103	369,698
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	628,365	664,488
Securities Held to Maturity, Gross Unrealized Gains	915	1,252
Securities Held to Maturity, Gross Unrealized Losses	15,255	19,593
Securities Held to Maturity, Fair Value	614,025	646,147
Residential Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	593,502	654,262
Securities Held to Maturity, Gross Unrealized Losses	43,613	59,223
Securities Held to Maturity, Fair Value	549,889	595,039
Commercial Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	824,601	920,048
Securities Held to Maturity, Gross Unrealized Losses	55,404	75,803
Securities Held to Maturity, Fair Value	769,197	844,245
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	27,050	32,491
Securities Held to Maturity, Gross Unrealized Losses	1,006	1,702
Securities Held to Maturity, Fair Value	$ 26,044	$ 30,789