CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Amortized Cost	$ 963,726	$ 963,978
Financing receivable, allowance for credit loss, excluding accrued interest	$ 41,165	$ 40,414
Preferred stock, no par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	72,010	72,010
Preferred stock, liquidation preference, value	$ 1,000	$ 1,000
Common stock, par or stated value per share (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares, issued (in shares)	25,485,383	25,351,809
Common stock, shares, outstanding (in shares)	25,485,383	25,351,809