Investment Securities (Schedule of Securities Available for Sale) (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 3,359,753	$ 3,266,829
Gross unrealized gains	20,085	31,608
Gross unrealized losses	(139,771)	(133,681)
Available for sale debt securities, at fair value	3,240,067	3,164,756
U.S. Treasury obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	274,883	274,500
Gross unrealized gains	106	190
Gross unrealized losses	(7,629)	(7,946)
Available for sale debt securities, at fair value	267,360	266,744
Government-agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	29,942	32,693
Gross unrealized gains	709	877
Gross unrealized losses	(7)	(31)
Available for sale debt securities, at fair value	30,644	33,539
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,798,914	2,705,346
Gross unrealized gains	12,922	23,454
Gross unrealized losses	(121,783)	(116,453)
Available for sale debt securities, at fair value	2,690,053	2,612,347
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	40,193	41,619
Gross unrealized gains	433	409
Gross unrealized losses	(302)	(267)
Available for sale debt securities, at fair value	40,324	41,761
State and municipal obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	119,072	119,173
Gross unrealized gains	802	1,249
Gross unrealized losses	(8,182)	(7,423)
Available for sale debt securities, at fair value	111,692	112,999
Corporate obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	96,749	93,498
Gross unrealized gains	5,113	5,429
Gross unrealized losses	(1,868)	(1,561)
Available for sale debt securities, at fair value	$ 99,994	$ 97,366

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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