Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	$ 6,102,458	$ 5,774,133
Securities Available for Sale, Gross Unrealized Gains	20,629	3,030
Securities Available for Sale, Gross Unrealized Losses	486,411	615,672
Securities Available for Sale, Fair Value	5,636,676	5,161,491
U.S. Treasury And Government Agency Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	270,722	185,827
Securities Available for Sale, Gross Unrealized Gains	2,668	349
Securities Available for Sale, Gross Unrealized Losses	1,757	3,894
Securities Available for Sale, Fair Value	271,633	182,282
Municipal Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	196,524	200,272
Securities Available for Sale, Gross Unrealized Gains	13
Securities Available for Sale, Gross Unrealized Losses	2,283	3,942
Securities Available for Sale, Fair Value	194,254	196,330
Residential Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	2,566,235	2,482,109
Securities Available for Sale, Gross Unrealized Gains	6,090	496
Securities Available for Sale, Gross Unrealized Losses	300,259	353,554
Securities Available for Sale, Fair Value	2,272,066	2,129,051
Commercial Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	3,019,759	2,849,372
Securities Available for Sale, Gross Unrealized Gains	11,858	2,185
Securities Available for Sale, Gross Unrealized Losses	179,361	250,592
Securities Available for Sale, Fair Value	2,852,256	2,600,965
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	31,718	37,553
Securities Available for Sale, Gross Unrealized Losses	1,565	2,306
Securities Available for Sale, Fair Value	30,153	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	1,186	1,384
Securities Available for Sale, Fair Value	$ 16,314	$ 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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