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Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	$ 6,287,446	$ 6,341,322
Securities Available for Sale, Gross Unrealized Gains	17,322	25,997
Securities Available for Sale, Gross Unrealized Losses	328,382	405,402
Securities Available for Sale, Fair Value	5,976,386	5,961,917
U.S. Treasury And Government Agency Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	279,080	266,825
Securities Available for Sale, Gross Unrealized Gains	4,562	3,705
Securities Available for Sale, Gross Unrealized Losses	1,175	1,198
Securities Available for Sale, Fair Value	282,467	269,332
Municipal Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	180,786	191,754
Securities Available for Sale, Gross Unrealized Gains	49	82
Securities Available for Sale, Gross Unrealized Losses	692	508
Securities Available for Sale, Fair Value	180,143	191,328
Residential Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	2,567,467	2,620,980
Securities Available for Sale, Gross Unrealized Gains	6,254	11,643
Securities Available for Sale, Gross Unrealized Losses	240,316	256,994
Securities Available for Sale, Fair Value	2,333,405	2,375,629
Commercial Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	3,218,115	3,217,663
Securities Available for Sale, Gross Unrealized Gains	6,457	10,530
Securities Available for Sale, Gross Unrealized Losses	84,252	144,868
Securities Available for Sale, Fair Value	3,140,320	3,083,325
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	24,998	27,100
Securities Available for Sale, Gross Unrealized Losses	1,184	1,154
Securities Available for Sale, Fair Value	23,814	25,946
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	17,000	17,000
Securities Available for Sale, Gross Unrealized Gains		37
Securities Available for Sale, Gross Unrealized Losses	763	680
Securities Available for Sale, Fair Value	$ 16,237	$ 16,357

X

- Definition

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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