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Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021
Income Taxes [Line Items]
Bad debt reserves, created for tax purposes		$ 52,800,000
Unrecognized deferred income tax liability		13,000,000
Valuation allowance recorded	$ 0	0
Decrease in unrecognized tax benefits	0
Federal
Income Taxes [Line Items]
Operating loss carryforwards	52,400,000	36,700,000
State
Income Taxes [Line Items]
Operating loss carryforwards	$ 132,200,000	116,100,000
AnchorBank WI
Income Taxes [Line Items]
Bad debt reserves, created for tax purposes		50,900,000
Lafayette Savings Bank
Income Taxes [Line Items]
Bad debt reserves, created for tax purposes		$ 1,900,000

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Income taxes.

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