Derivative Instruments - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025	Sep. 30, 2025
Derivatives, Fair Value [Line Items]
Maximum notional contract amount as percent of total assets	25.00%
Interest income, investment securities	$ 31,882,000	$ 47,257,000
Subordinated notes
Derivatives, Fair Value [Line Items]
Face amount of debt				$ 325,000,000.0
Fair Value Hedges
Derivatives, Fair Value [Line Items]
Derivative, average variable interest rate	1.21%		1.21%
Interest income, investment securities	$ 6,200,000
Derivative liabilities, Notional	325,000,000		$ 325,000,000
Derivative assets, notional amount	1,001,715,000		$ 1,001,715,000
Risk Participation Agreements
Derivatives, Fair Value [Line Items]
Derivative, notional amount	12,400,000
Energy Related Derivative
Derivatives, Fair Value [Line Items]
Derivative liabilities, Notional	0
Derivative assets, notional amount	$ 0