Investment Securities - Gross Unrealized Losses and Estimated Fair Value of Available for Sale Debt Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Available-for-sale, Fair Value
Less than 12 months, fair value	$ 1,070,818	$ 192,957
12 months or longer, fair value	1,197,254	1,303,456
Total, fair value	2,268,072	1,496,412
Available-for-sale, Unrealized Losses
Less than 12 months, gross unrealized losses	(12,491)	(4,949)
12 months or longer, gross unrealized losses	(133,250)	(128,732)
Total, gross unrealized losses	(145,741)	(133,681)
U.S. Treasury obligations
Available-for-sale, Fair Value
Less than 12 months, fair value	0	0
12 months or longer, fair value	172,950	245,675
Total, fair value	172,950	245,675
Available-for-sale, Unrealized Losses
Less than 12 months, gross unrealized losses	0	0
12 months or longer, gross unrealized losses	(6,401)	(7,946)
Total, gross unrealized losses	(6,401)	(7,946)
Government-agency obligations
Available-for-sale, Fair Value
Less than 12 months, fair value	7,544	8,541
12 months or longer, fair value	2,119	0
Total, fair value	9,663	8,541
Available-for-sale, Unrealized Losses
Less than 12 months, gross unrealized losses	(204)	(31)
12 months or longer, gross unrealized losses	(7)	0
Total, gross unrealized losses	(211)	(31)
Mortgage-backed securities
Available-for-sale, Fair Value
Less than 12 months, fair value	1,018,248	133,316
12 months or longer, fair value	932,078	984,261
Total, fair value	1,950,326	1,117,577
Available-for-sale, Unrealized Losses
Less than 12 months, gross unrealized losses	(11,787)	(4,119)
12 months or longer, gross unrealized losses	(118,391)	(112,334)
Total, gross unrealized losses	(130,178)	(116,453)
Asset-backed securities
Available-for-sale, Fair Value
Less than 12 months, fair value	10,042	20,493
12 months or longer, fair value	5,649	1,605
Total, fair value	15,690	22,098
Available-for-sale, Unrealized Losses
Less than 12 months, gross unrealized losses	(44)	(129)
12 months or longer, gross unrealized losses	(167)	(138)
Total, gross unrealized losses	(211)	(267)
State and municipal obligations
Available-for-sale, Fair Value
Less than 12 months, fair value	13,249	21,613
12 months or longer, fair value	65,318	53,173
Total, fair value	78,567	74,786
Available-for-sale, Unrealized Losses
Less than 12 months, gross unrealized losses	(191)	(665)
12 months or longer, gross unrealized losses	(7,179)	(6,758)
Total, gross unrealized losses	(7,370)	(7,423)
Corporate obligations
Available-for-sale, Fair Value
Less than 12 months, fair value	21,735	8,994
12 months or longer, fair value	19,140	18,742
Total, fair value	40,875	27,736
Available-for-sale, Unrealized Losses
Less than 12 months, gross unrealized losses	(265)	(6)
12 months or longer, gross unrealized losses	(1,104)	(1,555)
Total, gross unrealized losses	$ (1,370)	$ (1,561)

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