Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	$ 6,340,945	$ 6,341,322
Securities Available for Sale, Gross Unrealized Gains	10,488	25,997
Securities Available for Sale, Gross Unrealized Losses	345,213	405,402
Securities Available for Sale, Fair Value	6,006,220	5,961,917
U.S. Treasury And Government Agency Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	288,981	266,825
Securities Available for Sale, Gross Unrealized Gains	2,223	3,705
Securities Available for Sale, Gross Unrealized Losses	1,697	1,198
Securities Available for Sale, Fair Value	289,507	269,332
Municipal Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	164,084	191,754
Securities Available for Sale, Gross Unrealized Gains	19	82
Securities Available for Sale, Gross Unrealized Losses	246	508
Securities Available for Sale, Fair Value	163,857	191,328
Residential Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	2,502,473	2,620,980
Securities Available for Sale, Gross Unrealized Gains	4,661	11,643
Securities Available for Sale, Gross Unrealized Losses	244,273	256,994
Securities Available for Sale, Fair Value	2,262,861	2,375,629
Commercial Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	3,342,418	3,217,663
Securities Available for Sale, Gross Unrealized Gains	3,574	10,530
Securities Available for Sale, Gross Unrealized Losses	97,293	144,868
Securities Available for Sale, Fair Value	3,248,699	3,083,325
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	22,989	27,100
Securities Available for Sale, Gross Unrealized Losses	1,193	1,154
Securities Available for Sale, Fair Value	21,796	25,946
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	20,000	17,000
Securities Available for Sale, Gross Unrealized Gains	11	37
Securities Available for Sale, Gross Unrealized Losses	511	680
Securities Available for Sale, Fair Value	$ 19,500	$ 16,357

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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