Securities (Amortized Cost and Fair Value of Debt Securities Held to Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	$ 2,360,441	$ 2,435,663
Securities Held to Maturity, Gross Unrealized Gains	282	169
Securities Held to Maturity, Gross Unrealized Losses	166,096	202,306
Securities Held to Maturity, Fair Value	2,194,627	2,233,526
U.S. Treasury And Government Agency Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	389,904	394,689
Securities Held to Maturity, Gross Unrealized Gains	221
Securities Held to Maturity, Gross Unrealized Losses	37,288	45,876
Securities Held to Maturity, Fair Value	352,837	348,813
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	585,857	623,907
Securities Held to Maturity, Gross Unrealized Gains	61	169
Securities Held to Maturity, Gross Unrealized Losses	17,395	20,867
Securities Held to Maturity, Fair Value	568,523	603,209
Residential Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	553,972	573,057
Securities Held to Maturity, Gross Unrealized Losses	49,163	61,525
Securities Held to Maturity, Fair Value	504,809	511,532
Commercial Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	806,954	818,604
Securities Held to Maturity, Gross Unrealized Losses	61,296	72,854
Securities Held to Maturity, Fair Value	745,658	745,750
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	23,754	25,406
Securities Held to Maturity, Gross Unrealized Losses	954	1,184
Securities Held to Maturity, Fair Value	$ 22,800	$ 24,222