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Consolidated Balance Sheets (Parenthetical) - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Statement of Financial Position [Abstract]    
Available-for-sale, amortized cost $ 2,384,325,000 $ 2,742,987,000
Allowance for credit loss $ 0 $ 0
Preferred stock, shares authorized (in shares) 1,000,000 1,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, shares authorized (in shares) 50,000,000 50,000,000
Common stock, shares issued (in shares) 33,268,102 33,331,513
Common stock, shares outstanding (in shares) 33,268,102 33,331,513