Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	$ 5,745,280	$ 5,496,718
Securities Available for Sale, Gross Unrealized Gains	24,384	11,570
Securities Available for Sale, Gross Unrealized Losses	473,517	593,093
Securities Available for Sale, Fair Value	5,296,147	4,915,195
U.S. Treasury And Government Agency Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	171,333	97,741
Securities Available for Sale, Gross Unrealized Gains	3,806	1,581
Securities Available for Sale, Gross Unrealized Losses	1,371	1,514
Securities Available for Sale, Fair Value	173,768	97,808
Municipal Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	201,128	203,533
Securities Available for Sale, Gross Unrealized Gains	55	79
Securities Available for Sale, Gross Unrealized Losses	1,824	2,200
Securities Available for Sale, Fair Value	199,359	201,412
Residential Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	2,469,381	2,440,411
Securities Available for Sale, Gross Unrealized Gains	6,687	2,734
Securities Available for Sale, Gross Unrealized Losses	280,396	329,279
Securities Available for Sale, Fair Value	2,195,672	2,113,866
Commercial Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	2,839,988	2,683,872
Securities Available for Sale, Gross Unrealized Gains	13,836	7,176
Securities Available for Sale, Gross Unrealized Losses	185,916	253,576
Securities Available for Sale, Fair Value	2,667,908	2,437,472
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	39,950	47,661
Securities Available for Sale, Gross Unrealized Losses	1,964	3,376
Securities Available for Sale, Fair Value	37,986	44,285
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	23,500	23,500
Securities Available for Sale, Gross Unrealized Losses	2,046	3,148
Securities Available for Sale, Fair Value	$ 21,454	$ 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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