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Income Taxes - Additional Information (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
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
Federal
Income Taxes [Line Items]
Operating loss carryforwards	36,700,000	52,400,000
State
Income Taxes [Line Items]
Operating loss carryforwards	116,100,000	$ 132,200,000
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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Amount of bad debt reserves for tax purposes of qualified lenders excluded in calculating deferred taxes.

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