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Investment Securities - Investments Classified by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]    
Available-for-sale investments, One year or less $ 219,044  
Available-for-sale investments, After 1 through 5 years 161,986  
Available-for-sale investments, After 5 through 10 years 123,619  
Available-for-sale investments, After ten years 585,586  
Available-for-sale investments, Fair Value $ 1,090,235 $ 1,063,292
Available-for-sale, Weighted average yield, One year or less (in hundredths) 2.10%  
Available-for-sale, Weighted average yield, After 1 through 5 years (in hundredths) 2.25%  
Available-for-sale, Weighted average yield, After 5 through 10 years (in hundredths) 2.25%  
Available-for-sale, Weighted average yield, After ten years (in hundredths) 2.33%  
Available-for-sale, Weighted average yield, Total (in hundredths) 2.27%  
Available-for-sale, Full Tax-equivalent yield, One year or less (in hundredths) 2.25%  
Available-for-sale, Full Tax-equivalent yield, After 1 through 5 years (in hundredths) 2.79%  
Available-for-sale, Full Tax-equivalent yield, After 5 through 10 years (in hundredths) 2.63%  
Available-for-sale, Full Tax-equivalent yield, After ten years (in hundredths) 2.34%  
Available-for-sale, Full Tax-equivalent yield, Total (in hundredths) 2.43%  
Held-to-maturity, Maturity [Abstract]    
Held-to-maturity, One Year or less $ 0  
Held-to-maturity, After 1 through 5 years 0  
Held-to-maturity, After 5 through 10 years 0  
Held-to-maturity, After ten years 2,290  
Held-to-maturity $ 2,290 2,279
Held To Maturity, Weighted average yield, One year or less 0.00%  
Held To Maturity, Weighted average yield, After 1 through 5 years 0.00%  
Held To Maturity, Weighted average yield, After 5 through 10 years 0.00%  
Held To Maturity, Weighted average yield, After ten years 0.00%  
Held To Maturity, Weighted average yield, Total 0.00%  
Held To Maturity, Full tax-equivalent yield, One year or less 0.00%  
Held To Maturity, Full tax-equivalent yield, After 1 through 5 years 0.00%  
Held To Maturity, Full tax-equivalent yield, After 5 through 10 years 0.00%  
Held To Maturity, Full tax-equivalent yield, After ten years 0.00%  
Held To Maturity, Full tax-equivalent yield, Total 0.00%  
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, One year or less $ 142,826  
Available-for-sale investments, After 1 through 5 years 9,933  
Available-for-sale investments, After 5 through 10 years 0  
Available-for-sale investments, After ten years 0  
Available-for-sale investments, Fair Value 152,759 191,358
Obligations of States and Political Subdivisions    
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]    
Available-for-sale investments, One year or less 43,473  
Available-for-sale investments, After 1 through 5 years 143,535  
Available-for-sale investments, After 5 through 10 years 82,913  
Available-for-sale investments, After ten years 2,587  
Available-for-sale investments, Fair Value 272,508 267,740
Mortgage-backed Securities: GSE Residential    
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]    
Available-for-sale investments, One year or less 3,291  
Available-for-sale investments, After 1 through 5 years 3,656  
Available-for-sale investments, After 5 through 10 years 39,860  
Available-for-sale investments, After ten years 582,999  
Available-for-sale investments, Fair Value 629,806 539,742
Other Securities    
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]    
Available-for-sale investments, One year or less 29,454  
Available-for-sale investments, After 1 through 5 years 4,862  
Available-for-sale investments, After 5 through 10 years 846  
Available-for-sale investments, After ten years 0  
Available-for-sale investments, Fair Value 35,162 64,452
Other Investments    
Held-to-maturity, Maturity [Abstract]    
Held-to-maturity, One Year or less 0  
Held-to-maturity, After 1 through 5 years 0  
Held-to-maturity, After 5 through 10 years 0  
Held-to-maturity, After ten years 2,290  
Held-to-maturity $ 2,290 $ 2,279