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Securities - Continuous Unrealized Loss Position (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 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 458 556
Less Than 12 Months, Fair Value $ 219,767 $ 244,529
Less Than 12 Months, Unrealized Losses (8,161) (12,686)
12 Months or Greater, Fair Value 305,660 320,496
12 Months or Greater, Unrealized Losses (33,846) (38,976)
Fair Value 525,427 565,025
Unrealized Losses $ (42,007) $ (51,662)
Percentage of depreciation from amortized cost experienced by debt securities in unrealized loss position 5.20% 8.40%
Allowance for available for sale securities $ 0 $ 0
Accrued interest receivable on securities $ 6,400 $ 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 5 14
Less Than 12 Months, Fair Value $ 151,220 $ 157,091
Less Than 12 Months, Unrealized Losses (7,737) (12,090)
Fair Value 151,220 157,091
Unrealized Losses $ (7,737) $ (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 204 236
Less Than 12 Months, Fair Value $ 11,974 $ 21,329
Less Than 12 Months, Unrealized Losses (127) (120)
12 Months or Greater, Fair Value 93,979 95,774
12 Months or Greater, Unrealized Losses (15,424) (17,529)
Fair Value 105,953 117,103
Unrealized Losses $ (15,551) $ (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 112 168
Less Than 12 Months, Fair Value $ 16,268 $ 47,636
Less Than 12 Months, Unrealized Losses (96) (391)
12 Months or Greater, Fair Value 117,953 118,824
12 Months or Greater, Unrealized Losses (12,984) (15,434)
Fair Value 134,221 166,460
Unrealized Losses $ (13,080) $ (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 89 93
Less Than 12 Months, Fair Value $ 9,881 $ 6,860
Less Than 12 Months, Unrealized Losses (138) (75)
12 Months or Greater, Fair Value 80,091 91,666
12 Months or Greater, Unrealized Losses (5,368) (5,941)
Fair Value 89,972 98,526
Unrealized Losses $ (5,506) $ (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 37 38
Less Than 12 Months, Fair Value $ 8,552 $ 5,878
Less Than 12 Months, Unrealized Losses (4) (5)
12 Months or Greater, Fair Value 3,666 4,071
12 Months or Greater, Unrealized Losses (46) (51)
Fair Value 12,218 9,949
Unrealized Losses $ (50) $ (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 11 7
Less Than 12 Months, Fair Value $ 21,872 $ 5,735
Less Than 12 Months, Unrealized Losses (59) (5)
12 Months or Greater, Fair Value 9,971 10,161
12 Months or Greater, Unrealized Losses (24) (21)
Fair Value 31,843 15,896
Unrealized Losses $ (83) $ (26)