Investment Securities - Held-to-Maturity with Unrecognized Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Fair Value
Less than 12 months	$ 0	$ 37,007
12 months or longer	2,489,058	2,402,361
Total	2,489,058	2,439,368
Unrecognized Losses
Less than 12 months	0	(430)
12 months or longer	(356,103)	(483,630)
Total	(356,103)	(484,060)
U.S. government-sponsored entities and agencies
Fair Value
Less than 12 months	0	0
12 months or longer	710,909	664,331
Total	710,909	664,331
Unrecognized Losses
Less than 12 months	0	0
12 months or longer	(129,526)	(168,653)
Total	(129,526)	(168,653)
Mortgage-backed securities
Fair Value
Less than 12 months	0	0
12 months or longer	782,818	800,666
Total	782,818	800,666
Unrecognized Losses
Less than 12 months	0	0
12 months or longer	(127,505)	(169,546)
Total	(127,505)	(169,546)
States and political subdivisions
Fair Value
Less than 12 months	0	37,007
12 months or longer	995,331	937,364
Total	995,331	974,371
Unrecognized Losses
Less than 12 months	0	(430)
12 months or longer	(99,072)	(145,431)
Total	$ (99,072)	$ (145,861)

Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for 12 months or longer.

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position.

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-Topic 320
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Fair value of investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position.

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for less than 12 months.

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