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Securities - Continuous Unrealized Loss Position (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
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 427 521
Less Than 12 Months, Fair Value $ 140,146 $ 95,041
Less Than 12 Months, Unrealized Losses (301) (1,320)
12 Months or Greater, Fair Value 336,450 378,544
12 Months or Greater, Unrealized Losses (33,156) (46,522)
Fair Value 476,596 473,585
Unrealized Losses $ (33,457) $ (47,842)
Percentage debt securities with aggregate depreciation from amortized cost basis 6.60% 9.20%
Allowance for available for sale securities $ 0 $ 0
Accrued interest receivable on securities $ 6,300 $ 4,900
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 1  
Less Than 12 Months, Fair Value $ 105,875  
Less Than 12 Months, Unrealized Losses (123)  
Fair Value 105,875  
Unrealized Losses $ (123)  
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 169 212
Less Than 12 Months, Fair Value   $ 4,052
Less Than 12 Months, Unrealized Losses   (17)
12 Months or Greater, Fair Value $ 101,085 120,527
12 Months or Greater, Unrealized Losses (13,610) (19,018)
Fair Value 101,085 124,579
Unrealized Losses $ (13,610) $ (19,035)
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 113 128
Less Than 12 Months, Fair Value $ 12,988 $ 35,719
Less Than 12 Months, Unrealized Losses (37) (310)
12 Months or Greater, Fair Value 120,465 135,829
12 Months or Greater, Unrealized Losses (12,329) (16,091)
Fair Value 133,453 171,548
Unrealized Losses $ (12,366) $ (16,401)
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 103 110
Less Than 12 Months, Fair Value $ 8,018 $ 14,528
Less Than 12 Months, Unrealized Losses (114) (756)
12 Months or Greater, Fair Value 101,053 101,311
12 Months or Greater, Unrealized Losses (7,140) (11,123)
Fair Value 109,071 115,839
Unrealized Losses $ (7,254) $ (11,879)
SBA 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 32 47
Less Than 12 Months, Fair Value $ 458 $ 1,731
Less Than 12 Months, Unrealized Losses (1) (3)
12 Months or Greater, Fair Value 4,428 7,072
12 Months or Greater, Unrealized Losses (55) (99)
Fair Value 4,886 8,803
Unrealized Losses $ (56) $ (102)
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 9 24
Less Than 12 Months, Fair Value $ 12,807 $ 39,011
Less Than 12 Months, Unrealized Losses (26) (234)
12 Months or Greater, Fair Value 9,419 13,805
12 Months or Greater, Unrealized Losses (22) (191)
Fair Value 22,226 52,816
Unrealized Losses $ (48) $ (425)