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Investments - Available-for-sale Securities in Unrealized Loss Positions (Q1) (Details)
$ in Thousands
Mar. 31, 2023
USD ($)
Security
Dec. 31, 2022
USD ($)
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 67 205 134
Debt securities, greater than 12 months, number of issues | Security 267 133 10
Debt securities, number of issues | Security 334 338 144
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]      
Debt securities, less than 12 months, fair value $ 7,377 $ 38,757 $ 95,923
Debt securities, greater than 12 months, fair value 102,547 71,142 7,801
Debt securities, fair value 109,924 109,899 103,724
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]      
Debt securities, less than 12 months, unrealized losses (193) (4,857) (1,750)
Debt securities, greater than 12 months, unrealized losses (14,449) (12,062) (97)
Debt securities, total unrealized losses $ (14,642) $ (16,919) $ (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 2 8 6
Debt securities, greater than 12 months, number of issues | Security 10 5 1
Debt securities, number of issues | Security 12 13 7
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]      
Debt securities, less than 12 months, fair value $ 900 $ 3,534 $ 10,323
Debt securities, greater than 12 months, fair value 6,071 3,964 4,728
Debt securities, fair value 6,971 7,498 15,051
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]      
Debt securities, less than 12 months, unrealized losses (6) (135) (47)
Debt securities, greater than 12 months, unrealized losses (243) (200) (30)
Debt securities, total unrealized losses $ (249) $ (335) $ (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 13 77 41
Debt securities, greater than 12 months, number of issues | Security 110 45 4
Debt securities, number of issues | Security 123 122 45
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]      
Debt securities, less than 12 months, fair value $ 3,229 $ 12,966 $ 8,875
Debt securities, greater than 12 months, fair value 18,267 7,147 446
Debt securities, fair value 21,496 20,113 9,321
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]      
Debt securities, less than 12 months, unrealized losses (80) (2,318) (172)
Debt securities, greater than 12 months, unrealized losses (3,786) (2,354) (17)
Debt securities, total unrealized losses $ (3,866) $ (4,672) $ (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 4 27 41
Debt securities, greater than 12 months, number of issues | Security 64 42 1
Debt securities, number of issues | Security 68 69 42
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]      
Debt securities, less than 12 months, fair value $ 1,509 $ 10,069 $ 22,748
Debt securities, greater than 12 months, fair value 29,422 20,890 705
Debt securities, fair value 30,931 30,959 23,453
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]      
Debt securities, less than 12 months, unrealized losses (41) (1,373) (505)
Debt securities, greater than 12 months, unrealized losses (4,098) (3,415) (45)
Debt securities, total unrealized losses $ (4,139) $ (4,788) $ (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 3 6 24
Debt securities, greater than 12 months, number of issues | Security 22 20 2
Debt securities, number of issues | Security 25 26 26
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]      
Debt securities, less than 12 months, fair value $ 1,085 $ 3,188 $ 24,305
Debt securities, greater than 12 months, fair value 19,020 17,308 1,893
Debt securities, fair value 20,105 20,496 26,198
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]      
Debt securities, less than 12 months, unrealized losses (28) (76) (219)
Debt securities, greater than 12 months, unrealized losses (1,017) (1,170) (5)
Debt securities, total unrealized losses $ (1,045) $ (1,246) $ (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 33 57 12
Debt securities, greater than 12 months, number of issues | Security 35 12 0
Debt securities, number of issues | Security 68 69 12
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]      
Debt securities, less than 12 months, fair value $ 279 $ 4,006 $ 27,034
Debt securities, greater than 12 months, fair value 23,499 20,031 0
Debt securities, fair value 23,778 24,037 27,034
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]      
Debt securities, less than 12 months, unrealized losses (12) (573) (762)
Debt securities, greater than 12 months, unrealized losses (4,727) (4,584) 0
Debt securities, total unrealized losses $ (4,739) $ (5,157) $ (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 1 4 0
Debt securities, greater than 12 months, number of issues | Security 3 0 0
Debt securities, number of issues | Security 4 4 0
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]      
Debt securities, less than 12 months, fair value $ 209 $ 3,205 $ 0
Debt securities, greater than 12 months, fair value 3,056 0 0
Debt securities, fair value 3,265 3,205 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]      
Debt securities, less than 12 months, unrealized losses (20) (186) 0
Debt securities, greater than 12 months, unrealized losses (105) 0 0
Debt securities, total unrealized losses $ (125) $ (186) $ 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 11 26 10
Debt securities, greater than 12 months, number of issues | Security 23 9 2
Debt securities, number of issues | Security 34 35 12
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]      
Debt securities, less than 12 months, fair value $ 166 $ 1,789 $ 2,638
Debt securities, greater than 12 months, fair value 3,212 1,802 29
Debt securities, fair value 3,378 3,591 2,667
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]      
Debt securities, less than 12 months, unrealized losses (6) (196) (45)
Debt securities, greater than 12 months, unrealized losses (473) (339) 0
Debt securities, total unrealized losses $ (479) $ (535) $ (45)