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Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	$ 6,203,454	$ 5,774,133
Securities Available for Sale, Gross Unrealized Gains	26,581	3,030
Securities Available for Sale, Gross Unrealized Losses	436,365	615,672
Securities Available for Sale, Fair Value	5,793,670	5,161,491
U.S. Treasury And Government Agency Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	290,196	185,827
Securities Available for Sale, Gross Unrealized Gains	3,391	349
Securities Available for Sale, Gross Unrealized Losses	1,594	3,894
Securities Available for Sale, Fair Value	291,993	182,282
Municipal Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	193,771	200,272
Securities Available for Sale, Gross Unrealized Gains	90
Securities Available for Sale, Gross Unrealized Losses	728	3,942
Securities Available for Sale, Fair Value	193,133	196,330
Residential Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	2,578,927	2,482,109
Securities Available for Sale, Gross Unrealized Gains	9,188	496
Securities Available for Sale, Gross Unrealized Losses	272,605	353,554
Securities Available for Sale, Fair Value	2,315,510	2,129,051
Commercial Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	3,093,658	2,849,372
Securities Available for Sale, Gross Unrealized Gains	13,912	2,185
Securities Available for Sale, Gross Unrealized Losses	159,154	250,592
Securities Available for Sale, Fair Value	2,948,416	2,600,965
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities Available for Sale, Amortized Cost	29,402	37,553
Securities Available for Sale, Gross Unrealized Losses	1,374	2,306
Securities Available for Sale, Fair Value	28,028	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	910	1,384
Securities Available for Sale, Fair Value	$ 16,590	$ 17,616

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- 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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