Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	$ 308,087	$ 21,217
Available-for-sale, Less than 12 months, Unrealized Losses	(5,021)	(143)
Available-for-sale, 12 months or longer, Fair Value	839,706	888,695
Available-for-sale, 12 months or longer, Unrealized losses	(139,912)	(141,589)
Available-for-sale, Total Fair Value	1,147,793	909,912
Available-for-sale, Total Unrealized Losses	(144,933)	(141,732)
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	0	0
Available-for-sale, Less than 12 months, Unrealized Losses	0	0
Available-for-sale, 12 months or longer, Fair Value	142,366	142,833
Available-for-sale, 12 months or longer, Unrealized losses	(10,147)	(9,782)
Available-for-sale, Total Fair Value	142,366	142,833
Available-for-sale, Total Unrealized Losses	(10,147)	(9,782)
Obligations of States and Political Subdivisions
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	24,881	5,923
Available-for-sale, Less than 12 months, Unrealized Losses	(189)	(8)
Available-for-sale, 12 months or longer, Fair Value	231,589	246,076
Available-for-sale, 12 months or longer, Unrealized losses	(44,693)	(47,650)
Available-for-sale, Total Fair Value	256,470	251,999
Available-for-sale, Total Unrealized Losses	(44,882)	(47,658)
Mortgage-backed Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	279,235	11,327
Available-for-sale, Less than 12 months, Unrealized Losses	(4,803)	(102)
Available-for-sale, 12 months or longer, Fair Value	449,575	480,583
Available-for-sale, 12 months or longer, Unrealized losses	(84,445)	(83,418)
Available-for-sale, Total Fair Value	728,810	491,910
Available-for-sale, Total Unrealized Losses	(89,248)	(83,520)
Corporate bonded debt
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	3,971	3,967
Available-for-sale, Less than 12 months, Unrealized Losses	(29)	(33)
Available-for-sale, 12 months or longer, Fair Value	16,176	19,203
Available-for-sale, 12 months or longer, Unrealized losses	(627)	(739)
Available-for-sale, Total Fair Value	20,147	23,170
Available-for-sale, Total Unrealized Losses	$ (656)	$ (772)

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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