Available for Sale Debt Securities - Disclosure on Securities Available for Sale with Temporary Impairment (Detail) $ in Thousands	Dec. 31, 2025 USD ($)
Available-for-sale, Fair Value
Less than 12 months, fair value	$ 192,957
12 months or longer, fair value	1,303,456
Total, fair value	1,496,412
Available-for-sale, Unrealized Losses
Less than 12 months, gross unrealized losses	(4,949)
12 months or longer, gross unrealized losses	(128,732)
Total, gross unrealized losses	(133,681)
U.S. Treasury obligations
Available-for-sale, Fair Value
Less than 12 months, fair value	0
12 months or longer, fair value	245,675
Total, fair value	245,675
Available-for-sale, Unrealized Losses
Less than 12 months, gross unrealized losses	0
12 months or longer, gross unrealized losses	(7,946)
Total, gross unrealized losses	(7,946)
Government-agency obligations
Available-for-sale, Fair Value
Less than 12 months, fair value	8,541
12 months or longer, fair value	0
Total, fair value	8,541
Available-for-sale, Unrealized Losses
Less than 12 months, gross unrealized losses	(31)
12 months or longer, gross unrealized losses	0
Total, gross unrealized losses	(31)
Mortgage-backed securities
Available-for-sale, Fair Value
Less than 12 months, fair value	133,316
12 months or longer, fair value	984,261
Total, fair value	1,117,577
Available-for-sale, Unrealized Losses
Less than 12 months, gross unrealized losses	(4,119)
12 months or longer, gross unrealized losses	(112,334)
Total, gross unrealized losses	(116,453)
Asset-backed securities
Available-for-sale, Fair Value
Less than 12 months, fair value	20,493
12 months or longer, fair value	1,605
Total, fair value	22,098
Available-for-sale, Unrealized Losses
Less than 12 months, gross unrealized losses	(129)
12 months or longer, gross unrealized losses	(138)
Total, gross unrealized losses	(267)
State and municipal obligations
Available-for-sale, Fair Value
Less than 12 months, fair value	21,613
12 months or longer, fair value	53,173
Total, fair value	74,786
Available-for-sale, Unrealized Losses
Less than 12 months, gross unrealized losses	(665)
12 months or longer, gross unrealized losses	(6,758)
Total, gross unrealized losses	(7,423)
Corporate obligations
Available-for-sale, Fair Value
Less than 12 months, fair value	8,994
12 months or longer, fair value	18,742
Total, fair value	27,736
Available-for-sale, Unrealized Losses
Less than 12 months, gross unrealized losses	(6)
12 months or longer, gross unrealized losses	(1,555)
Total, gross unrealized losses	$ (1,561)

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