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Investment Securities - Additional Information (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
USD ($)
Position
Security
Dec. 31, 2024
USD ($)
Position
Security
Schedule Of Available For Sale Securities [Line Items]    
Equity securities, at fair value $ 4,471 $ 4,439
Tax rate used to calculate tax-equivalent yields (in hundredths) 21.00%  
Percentage investment book value exceeds stockholders' equity (in hundredths) 10.00%  
Debt securities, available-for-sale, restricted $ 529,800 632,900
Available-for-sale, 12 months or longer, Fair Value 977,677 1,001,277
12 months or longer, unrealized losses $ 184,984 $ 193,568
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies    
Schedule Of Available For Sale Securities [Line Items]    
Number of securities in unrealized loss positions | Security 27 29
Available-for-sale, 12 months or longer, Fair Value $ 183,392 $ 189,327
12 months or longer, unrealized losses $ 18,144 $ 21,158
Held-to-maturity, securities in unrealized loss positions, qualitative disclosure, number of positions | Position 0 0
Obligations of States and Political Subdivisions    
Schedule Of Available For Sale Securities [Line Items]    
Number of securities in unrealized loss positions | Security 251 247
Available-for-sale, 12 months or longer, Fair Value $ 237,147 $ 241,502
12 months or longer, unrealized losses $ 60,804 $ 55,193
Mortgage-backed Securities: GSE Residential    
Schedule Of Available For Sale Securities [Line Items]    
Number of securities in unrealized loss positions | Security 233 241
Available-for-sale, 12 months or longer, Fair Value $ 503,901 $ 511,746
12 months or longer, unrealized losses $ 103,886 $ 114,552
Other Securities    
Schedule Of Available For Sale Securities [Line Items]    
Number of securities in unrealized loss positions | Security 36 40
Available-for-sale, 12 months or longer, Fair Value $ 53,237 $ 58,702
12 months or longer, unrealized losses $ 2,150 $ 2,665