Investment Securities (Disclosure on Securities Available for Sale with Temporary Impairment) (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Available-for-sale, Fair Value
Less than 12 months, fair value	$ 685,047	$ 192,957
12 months or more, fair value	1,320,198	1,303,456
Total, fair value	2,005,245	1,496,412
Available-for-sale, Unrealized Losses
Less than 12 months, gross unrealized losses	(5,632)	(4,949)
12 months or more, gross unrealized losses	(134,139)	(128,732)
Total, gross unrealized losses	(139,771)	(133,681)
U.S. Treasury obligations
Available-for-sale, Fair Value
Less than 12 months, fair value	0	0
12 months or more, fair value	246,199	245,675
Total, fair value	246,199	245,675
Available-for-sale, Unrealized Losses
Less than 12 months, gross unrealized losses	0	0
12 months or more, gross unrealized losses	(7,629)	(7,946)
Total, gross unrealized losses	(7,629)	(7,946)
Government-agency obligations
Available-for-sale, Fair Value
Less than 12 months, fair value	0	8,541
12 months or more, fair value	2,154	0
Total, fair value	2,154	8,541
Available-for-sale, Unrealized Losses
Less than 12 months, gross unrealized losses	0	(31)
12 months or more, gross unrealized losses	(7)	0
Total, gross unrealized losses	(7)	(31)
Mortgage-backed securities
Available-for-sale, Fair Value
Less than 12 months, fair value	641,639	133,316
12 months or more, fair value	980,474	984,261
Total, fair value	1,622,113	1,117,577
Available-for-sale, Unrealized Losses
Less than 12 months, gross unrealized losses	(4,860)	(4,119)
12 months or more, gross unrealized losses	(116,923)	(112,334)
Total, gross unrealized losses	(121,783)	(116,453)
Asset-backed securities
Available-for-sale, Fair Value
Less than 12 months, fair value	12,539	20,493
12 months or more, fair value	8,800	1,605
Total, fair value	21,339	22,098
Available-for-sale, Unrealized Losses
Less than 12 months, gross unrealized losses	(98)	(129)
12 months or more, gross unrealized losses	(204)	(138)
Total, gross unrealized losses	(302)	(267)
State and municipal obligations
Available-for-sale, Fair Value
Less than 12 months, fair value	19,101	21,613
12 months or more, fair value	63,936	53,173
Total, fair value	83,037	74,786
Available-for-sale, Unrealized Losses
Less than 12 months, gross unrealized losses	(442)	(665)
12 months or more, gross unrealized losses	(7,740)	(6,758)
Total, gross unrealized losses	(8,182)	(7,423)
Corporate obligations
Available-for-sale, Fair Value
Less than 12 months, fair value	11,768	8,994
12 months or more, fair value	18,635	18,742
Total, fair value	30,403	27,736
Available-for-sale, Unrealized Losses
Less than 12 months, gross unrealized losses	(232)	(6)
12 months or more, gross unrealized losses	(1,636)	(1,555)
Total, gross unrealized losses	$ (1,868)	$ (1,561)

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