Loans and Allowance for Credit Losses - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026 USD ($) default commitment	Jun. 30, 2025 USD ($) commitment default	Jun. 30, 2026 USD ($) default commitment	Jun. 30, 2025 USD ($) default commitment	Dec. 31, 2025 USD ($)
Financing Receivable, Past Due [Line Items]
Unearned income	$ 3.6		$ 3.6		$ 4.8
Purchase accounting fair value adjustments	$ 1.7		$ 1.7		$ 2.0
Number of modified contracts with payment default | default	2	1	3	2
Amount of defaulted TDRs that defaulted	$ 10.3	$ 0.1	$ 13.7	$ 3.9
Number of commitments to lend | commitment	12	11	12	11
Commitment to lend	$ 1.7	$ 0.1	$ 1.7	$ 0.1