Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	$ 5,774,133	$ 5,496,718
Securities Available for Sale, Gross Unrealized Gains	3,030	11,570
Securities Available for Sale, Gross Unrealized Losses	615,672	593,093
Securities Available for Sale, Fair Value	5,161,491	4,915,195
U.S. Treasury And Government Agency Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	185,827	97,741
Securities Available for Sale, Gross Unrealized Gains	349	1,581
Securities Available for Sale, Gross Unrealized Losses	3,894	1,514
Securities Available for Sale, Fair Value	182,282	97,808
Municipal Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	200,272	203,533
Securities Available for Sale, Gross Unrealized Gains	0	79
Securities Available for Sale, Gross Unrealized Losses	3,942	2,200
Securities Available for Sale, Fair Value	196,330	201,412
Residential Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	2,482,109	2,440,411
Securities Available for Sale, Gross Unrealized Gains	496	2,734
Securities Available for Sale, Gross Unrealized Losses	353,554	329,279
Securities Available for Sale, Fair Value	2,129,051	2,113,866
Commercial Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	2,849,372	2,683,872
Securities Available for Sale, Gross Unrealized Gains	2,185	7,176
Securities Available for Sale, Gross Unrealized Losses	250,592	253,576
Securities Available for Sale, Fair Value	2,600,965	2,437,472
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	37,553	47,661
Securities Available for Sale, Gross Unrealized Losses	2,306	3,376
Securities Available for Sale, Fair Value	35,247	44,285
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	19,000	23,500
Securities Available for Sale, Gross Unrealized Losses	1,384	3,148
Securities Available for Sale, Fair Value	$ 17,616	$ 20,352

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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