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Securities - Continuous Unrealized Loss Position (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
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 535 530
Less Than 12 Months, Fair Value $ 116,615 $ 298,369
Less Than 12 Months, Unrealized Losses (3,602) (16,312)
12 Months or Greater, Fair Value 366,142 165,296
12 Months or Greater, Unrealized Losses (59,719) (34,411)
Fair Value 482,757 463,665
Unrealized Losses $ (63,321) $ (50,723)
Percentage debt securities with aggregate depreciation from amortized cost basis 11.60% 9.90%
Allowance for available for sale securities $ 0  
Accrued interest receivable on securities $ 4,300  
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 6
Less Than 12 Months, Fair Value $ 886 $ 2,330
Less Than 12 Months, Unrealized Losses (5) (41)
12 Months or Greater, Fair Value 880  
12 Months or Greater, Unrealized Losses (14)  
Fair Value 1,766 2,330
Unrealized Losses $ (19) $ (41)
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 218 225
Less Than 12 Months, Fair Value $ 8,358 $ 59,912
Less Than 12 Months, Unrealized Losses (232) (5,321)
12 Months or Greater, Fair Value 114,139 69,424
12 Months or Greater, Unrealized Losses (25,996) (19,893)
Fair Value 122,497 129,336
Unrealized Losses $ (26,228) $ (25,214)
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 140 130
Less Than 12 Months, Fair Value $ 68,938 $ 123,224
Less Than 12 Months, Unrealized Losses (2,205) (5,427)
12 Months or Greater, Fair Value 135,408 62,882
12 Months or Greater, Unrealized Losses (21,477) (12,173)
Fair Value 204,346 186,106
Unrealized Losses $ (23,682) $ (17,600)
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 109 100
Less Than 12 Months, Fair Value $ 18,899 $ 88,486
Less Than 12 Months, Unrealized Losses (1,024) (5,121)
12 Months or Greater, Fair Value 94,731 17,054
12 Months or Greater, Unrealized Losses (11,896) (1,968)
Fair Value 113,630 105,540
Unrealized Losses $ (12,920) $ (7,089)
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 47 49
Less Than 12 Months, Fair Value $ 2,319 $ 2,498
Less Than 12 Months, Unrealized Losses (6) (6)
12 Months or Greater, Fair Value 6,811 9,750
12 Months or Greater, Unrealized Losses (119) (153)
Fair Value 9,130 12,248
Unrealized Losses $ (125) $ (159)
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 16 20
Less Than 12 Months, Fair Value $ 17,215 $ 21,919
Less Than 12 Months, Unrealized Losses (130) (396)
12 Months or Greater, Fair Value 14,173 6,186
12 Months or Greater, Unrealized Losses (217) (224)
Fair Value 31,388 28,105
Unrealized Losses $ (347) $ (620)