Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	$ 5,845,045	$ 5,774,133
Securities Available for Sale, Gross Unrealized Gains	14,150	3,030
Securities Available for Sale, Gross Unrealized Losses	524,667	615,672
Securities Available for Sale, Fair Value	5,334,528	5,161,491
U.S. Treasury And Government Agency Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	208,408	185,827
Securities Available for Sale, Gross Unrealized Gains	2,303	349
Securities Available for Sale, Gross Unrealized Losses	1,651	3,894
Securities Available for Sale, Fair Value	209,060	182,282
Municipal Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	197,366	200,272
Securities Available for Sale, Gross Unrealized Gains	2
Securities Available for Sale, Gross Unrealized Losses	3,640	3,942
Securities Available for Sale, Fair Value	193,728	196,330
Residential Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	2,505,037	2,482,109
Securities Available for Sale, Gross Unrealized Gains	4,200	496
Securities Available for Sale, Gross Unrealized Losses	311,852	353,554
Securities Available for Sale, Fair Value	2,197,385	2,129,051
Commercial Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	2,882,206	2,849,372
Securities Available for Sale, Gross Unrealized Gains	7,645	2,185
Securities Available for Sale, Gross Unrealized Losses	204,652	250,592
Securities Available for Sale, Fair Value	2,685,199	2,600,965
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	34,528	37,553
Securities Available for Sale, Gross Unrealized Losses	1,824	2,306
Securities Available for Sale, Fair Value	32,704	35,247
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	17,500	19,000
Securities Available for Sale, Gross Unrealized Losses	1,048	1,384
Securities Available for Sale, Fair Value	$ 16,452	$ 17,616

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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