Securities (Amortized Cost and Fair Value of Debt Securities Held to Maturity) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized cost	$ 2,684,779	$ 2,852,495
Securities Held to Maturity, Gross unrealized gains	1,431	774
Securities Held to Maturity, Gross unrealized losses	200,292	237,871
Securities Held to Maturity, Fair value	2,485,918	2,615,398
U.S. Treasury And Government Agency Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized cost	413,490	426,454
Securities Held to Maturity, Gross unrealized gains	179	21
Securities Held to Maturity, Gross unrealized losses	43,971	49,044
Securities Held to Maturity, Fair value	369,698	377,431
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized cost	664,488	698,908
Securities Held to Maturity, Gross unrealized gains	1,252	753
Securities Held to Maturity, Gross unrealized losses	19,593	26,558
Securities Held to Maturity, Fair value	646,147	673,103
Residential Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized cost	654,262	734,478
Securities Held to Maturity, Gross unrealized losses	59,223	72,532
Securities Held to Maturity, Fair value	595,039	661,946
Commercial Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized cost	920,048	948,691
Securities Held to Maturity, Gross unrealized losses	75,803	87,211
Securities Held to Maturity, Fair value	844,245	861,480
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized cost	32,491	43,964
Securities Held to Maturity, Gross unrealized losses	1,702	2,526
Securities Held to Maturity, Fair value	$ 30,789	$ 41,438