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Investments - Available-for-sale Securities in Unrealized Loss Positions (Details)
$ in Thousands
Mar. 31, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
security
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]    
Debt securities, less than 12 months, number of issues | security 241 134
Debt securities, greater than 12 months, number of issues | security 44 10
Debt securities, number of issues | security 285 144
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 82,140 $ 95,923
Debt securities, greater than 12 months, fair value 51,068 7,801
Debt securities, fair value 133,208 103,724
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (4,140) (1,750)
Debt securities, greater than 12 months, unrealized losses (4,126) (97)
Debt securities, total unrealized losses $ (8,266) $ (1,847)
U.S. Government    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]    
Debt securities, less than 12 months, number of issues | security 8 6
Debt securities, greater than 12 months, number of issues | security 4 1
Debt securities, number of issues | security 12 7
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 10,508 $ 10,323
Debt securities, greater than 12 months, fair value 6,482 4,728
Debt securities, fair value 16,990 15,051
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (93) (47)
Debt securities, greater than 12 months, unrealized losses (198) (30)
Debt securities, total unrealized losses $ (291) $ (77)
State and local government    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]    
Debt securities, less than 12 months, number of issues | security 108 41
Debt securities, greater than 12 months, number of issues | security 8 4
Debt securities, number of issues | security 116 45
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 21,485 $ 8,875
Debt securities, greater than 12 months, fair value 866 446
Debt securities, fair value 22,351 9,321
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (1,724) (172)
Debt securities, greater than 12 months, unrealized losses (122) (17)
Debt securities, total unrealized losses $ (1,846) $ (189)
Corporate debt    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]    
Debt securities, less than 12 months, number of issues | security 54 41
Debt securities, greater than 12 months, number of issues | security 12 1
Debt securities, number of issues | security 66 42
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 23,456 $ 22,748
Debt securities, greater than 12 months, fair value 7,982 705
Debt securities, fair value 31,438 23,453
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (1,686) (505)
Debt securities, greater than 12 months, unrealized losses (900) (45)
Debt securities, total unrealized losses $ (2,586) $ (550)
Asset-backed securities    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]    
Debt securities, less than 12 months, number of issues | security 21 24
Debt securities, greater than 12 months, number of issues | security 8 2
Debt securities, number of issues | security 29 26
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 13,448 $ 24,305
Debt securities, greater than 12 months, fair value 12,240 1,893
Debt securities, fair value 25,688 26,198
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (122) (219)
Debt securities, greater than 12 months, unrealized losses (601) (5)
Debt securities, total unrealized losses $ (723) $ (224)
Mortgage-backed securities    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]    
Debt securities, less than 12 months, number of issues | security 29 12
Debt securities, greater than 12 months, number of issues | security 7 0
Debt securities, number of issues | security 36 12
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 6,714 $ 27,034
Debt securities, greater than 12 months, fair value 22,224 0
Debt securities, fair value 28,938 27,034
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (343) (762)
Debt securities, greater than 12 months, unrealized losses (2,228) 0
Debt securities, total unrealized losses $ (2,571) $ (762)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]    
Debt securities, less than 12 months, number of issues | security 3 0
Debt securities, greater than 12 months, number of issues | security 0 0
Debt securities, number of issues | security 3 0
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 3,111 $ 0
Debt securities, greater than 12 months, fair value 0 0
Debt securities, fair value 3,111 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (55) 0
Debt securities, greater than 12 months, unrealized losses 0 0
Debt securities, total unrealized losses $ (55) $ 0
Collateralized mortgage obligations    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]    
Debt securities, less than 12 months, number of issues | security 18 10
Debt securities, greater than 12 months, number of issues | security 5 2
Debt securities, number of issues | security 23 12
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, less than 12 months, fair value $ 3,418 $ 2,638
Debt securities, greater than 12 months, fair value 1,274 29
Debt securities, fair value 4,692 2,667
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, less than 12 months, unrealized losses (117) (45)
Debt securities, greater than 12 months, unrealized losses (77) 0
Debt securities, total unrealized losses $ (194) $ (45)