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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair value $ 77,621 $ 29,404
Less than 12 months, Unrealized losses (1,013) (464)
12 months or longer, Fair value 571,139 596,986
12 months or longer, Unrealized losses (72,053) (70,851)
U.S. government obligations and agencies    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair value 15,169 9,045
Less than 12 months, Unrealized losses (283) (108)
12 months or longer, Fair value 5,986 6,811
12 months or longer, Unrealized losses (497) (569)
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair value 5,517 1,387
Less than 12 months, Unrealized losses (59) (9)
12 months or longer, Fair value 347,969 365,893
12 months or longer, Unrealized losses (37,393) (37,088)
Mortgage-backed and asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair value 56,643 18,150
Less than 12 months, Unrealized losses (668) (316)
12 months or longer, Fair value 209,013 216,220
12 months or longer, Unrealized losses (33,046) (31,967)
Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair value 292 293
Less than 12 months, Unrealized losses (3) (1)
12 months or longer, Fair value 7,070 7,010
12 months or longer, Unrealized losses (1,009) (1,069)
Redeemable preferred stock    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair value 0 529
Less than 12 months, Unrealized losses 0 (30)
12 months or longer, Fair value 1,101 1,052
12 months or longer, Unrealized losses $ (108) $ (158)