Investment Securities - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, Fair Value	$ 1,076,883	$ 1,063,292
Held-to-maturity, Maturity [Abstract]
Held-to-maturity, After ten years	2,288
Held-to-maturity	2,288	2,279
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, Fair Value	144,080	191,358
Obligations of States and Political Subdivisions
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, Fair Value	280,633	267,740
Mortgage-backed Securities
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, Fair Value	624,666	539,742
Corporate bonded debt
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, Fair Value	27,504	64,452
Other Securities
Held-to-maturity, Maturity [Abstract]
Held-to-maturity	$ 2,288	$ 2,279