Derivative Financial Instruments - Narrative (Details) $ in Millions	1 Months Ended			3 Months Ended		9 Months Ended
	Dec. 31, 2024 USD ($)	Mar. 31, 2021 USD ($)	Jun. 30, 2020 USD ($)	Sep. 30, 2025 USD ($) derivative	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) derivative	Sep. 30, 2024 USD ($)
Asset Pledged as Collateral | Derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cash	$ 0.0			$ 0.3		$ 0.3
Back to Back Swaps | Derivatives not designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of derivatives | derivative				2		2
Interest rate swaps | Federal Home Loan Bank advances | Derivatives designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Payments for swap termination payments	$ 2.9
Interest rate swaps | Securities available-for-sale | Derivatives designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Payments for swap termination payments		$ 1.9
Amortization expense				$ 0.1	$ 0.1	$ 0.1	$ 0.1
Interest rate swaps | Loans | Derivatives designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Payments for swap termination payments			$ 46.1
Amortization expense				$ 1.0	$ 1.6	$ 2.7	$ 3.7
Weighted Average Remaining Maturity (years)						9 years