Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Statement of Financial Position [Abstract]
Securities, available-for-sale, at fair value	$ 1,865,732,000	$ 1,796,040,000
Securities, available-for-sale, at amortized cost	$ 0	$ 0
Common stock, stated value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	45,000,000	45,000,000