Investment Securities - Narrative (Details)	3 Months Ended
	Dec. 31, 2025 USD ($) security	Apr. 24, 2026	Mar. 31, 2026 USD ($) security $ / shares
Debt Securities, Available-for-sale [Line Items]
Held to maturity, amortized cost			$ 0
Debt securities, available-for-sale, sold at par value	$ 593,200,000
Loss on sale of securities, before tax	$ 69,500,000
Number of investment securities in unrealized loss position | security	114		181
Number of investment securities in unrealized loss position longer than 12 months | security			70
Number of investment securities in unrealized loss position less than 12 months | security			111
Debt securities, available-for-sale unrealized loss position, allowance for credit loss	$ 0		$ 0
Federal home loan bank stock, par value (in usd per share) | $ / shares			$ 100
Subsequent Event
Debt Securities, Available-for-sale [Line Items]
Federal home loan bank, dividend rate percentage		4.75%
Asset derivatives
Debt Securities, Available-for-sale [Line Items]
Federal home loan bank stock	$ 16,700,000		$ 16,700,000