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Securities - Continuous Unrealized Loss Position (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 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 519 521
Less Than 12 Months, Fair Value $ 92,970 $ 95,041
Less Than 12 Months, Unrealized Losses (1,071) (1,320)
12 Months or Greater, Fair Value 375,116 378,544
12 Months or Greater, Unrealized Losses (45,990) (46,522)
Fair Value 468,086 473,585
Unrealized Losses $ (47,061) $ (47,842)
Percentage debt securities with aggregate depreciation from amortized cost basis 9.10% 9.20%
Allowance for available for sale securities $ 0 $ 0
Accrued interest receivable on securities $ 5,200 $ 4,900
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Interest Receivable Interest Receivable
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 215 212
Less Than 12 Months, Fair Value $ 7,862 $ 4,052
Less Than 12 Months, Unrealized Losses (44) (17)
12 Months or Greater, Fair Value 122,437 120,527
12 Months or Greater, Unrealized Losses (19,114) (19,018)
Fair Value 130,299 124,579
Unrealized Losses $ (19,158) $ (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 129 128
Less Than 12 Months, Fair Value $ 42,583 $ 35,719
Less Than 12 Months, Unrealized Losses (665) (310)
12 Months or Greater, Fair Value 124,205 135,829
12 Months or Greater, Unrealized Losses (16,742) (16,091)
Fair Value 166,788 171,548
Unrealized Losses $ (17,407) $ (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 113 110
Less Than 12 Months, Fair Value $ 16,148 $ 14,528
Less Than 12 Months, Unrealized Losses (290) (756)
12 Months or Greater, Fair Value 105,583 101,311
12 Months or Greater, Unrealized Losses (9,957) (11,123)
Fair Value 121,731 115,839
Unrealized Losses $ (10,247) $ (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 45 47
Less Than 12 Months, Fair Value $ 1,973 $ 1,731
Less Than 12 Months, Unrealized Losses (5) (3)
12 Months or Greater, Fair Value 6,296 7,072
12 Months or Greater, Unrealized Losses (86) (99)
Fair Value 8,269 8,803
Unrealized Losses $ (91) $ (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 17 24
Less Than 12 Months, Fair Value $ 24,404 $ 39,011
Less Than 12 Months, Unrealized Losses (67) (234)
12 Months or Greater, Fair Value 16,595 13,805
12 Months or Greater, Unrealized Losses (91) (191)
Fair Value 40,999 52,816
Unrealized Losses $ (158) $ (425)