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Securities - Continuous Unrealized Loss Position (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Fair value and gross unrealized losses of securities with unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position    
Number of Holdings with unrealized losses | security 395 556
Less Than 12 Months, Fair Value $ 47,294 $ 244,529
Less Than 12 Months, Unrealized Losses (768) (12,686)
12 Months or Greater, Fair Value 414,769 320,496
12 Months or Greater, Unrealized Losses (35,853) (38,976)
Fair Value 462,063 565,025
Unrealized Losses $ (36,621) $ (51,662)
Percentage of depreciation from amortized cost experienced by debt securities in unrealized loss position 7.30% 8.40%
Allowance for available for sale securities $ 0 $ 0
Accrued interest receivable on securities $ 7,000 $ 6,200
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Interest Receivable Interest Receivable
U.S. Treasury Securities    
Fair value and gross unrealized losses of securities with unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position    
Number of Holdings with unrealized losses | security 2 14
Less Than 12 Months, Fair Value   $ 157,091
Less Than 12 Months, Unrealized Losses   (12,090)
12 Months or Greater, Fair Value $ 147,199  
12 Months or Greater, Unrealized Losses (8,703)  
Fair Value 147,199 157,091
Unrealized Losses $ (8,703) $ (12,090)
Municipal Bonds    
Fair value and gross unrealized losses of securities with unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position    
Number of Holdings with unrealized losses | security 191 236
Less Than 12 Months, Fair Value $ 19,961 $ 21,329
Less Than 12 Months, Unrealized Losses (654) (120)
12 Months or Greater, Fair Value 95,294 95,774
12 Months or Greater, Unrealized Losses (12,884) (17,529)
Fair Value 115,255 117,103
Unrealized Losses $ (13,538) $ (17,649)
Mortgage-Backed Securities    
Fair value and gross unrealized losses of securities with unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position    
Number of Holdings with unrealized losses | security 113 168
Less Than 12 Months, Fair Value $ 10,653 $ 47,636
Less Than 12 Months, Unrealized Losses (47) (391)
12 Months or Greater, Fair Value 115,179 118,824
12 Months or Greater, Unrealized Losses (10,852) (15,434)
Fair Value 125,832 166,460
Unrealized Losses $ (10,899) $ (15,825)
Corporate Securities    
Fair value and gross unrealized losses of securities with unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position    
Number of Holdings with unrealized losses | security 51 93
Less Than 12 Months, Fair Value $ 5,366 $ 6,860
Less Than 12 Months, Unrealized Losses (49) (75)
12 Months or Greater, Fair Value 47,728 91,666
12 Months or Greater, Unrealized Losses (3,372) (5,941)
Fair Value 53,094 98,526
Unrealized Losses $ (3,421) $ (6,016)
U.S Government Agency Securities    
Fair value and gross unrealized losses of securities with unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position    
Number of Holdings with unrealized losses | security 31 38
Less Than 12 Months, Fair Value $ 1,279 $ 5,878
Less Than 12 Months, Unrealized Losses (5) (5)
12 Months or Greater, Fair Value 2,470 4,071
12 Months or Greater, Unrealized Losses (36) (51)
Fair Value 3,749 9,949
Unrealized Losses $ (41) $ (56)
Asset-Backed Securities    
Fair value and gross unrealized losses of securities with unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position    
Number of Holdings with unrealized losses | security 7 7
Less Than 12 Months, Fair Value $ 10,035 $ 5,735
Less Than 12 Months, Unrealized Losses (13) (5)
12 Months or Greater, Fair Value 6,899 10,161
12 Months or Greater, Unrealized Losses (6) (21)
Fair Value 16,934 15,896
Unrealized Losses $ (19) $ (26)