Note 9 - Federal Home Loan Bank Advances (Details Textual) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Long-term Federal Home Loan Bank Advances, Total	$ 374,000,000	$ 394,000,000
Line of Credit Facility, Maximum Borrowing Capacity	889,000,000
Line of Credit Facility, Remaining Borrowing Capacity	509,000,000
Federal Home Loan Bank of Indianapolis [Member]
Long-term Federal Home Loan Bank Advances, Total	$ 374,000,000	$ 394,000,000
Federal Home Loan Bank of Indianapolis [Member] \| Minimum [Member]
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End	0.55%	0.55%
Federal Home Loan Bank of Indianapolis [Member] \| Maximum [Member]
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End	3.18%	3.18%
Federal Home Loan Bank of Indianapolis [Member] \| Weighted Average [Member]
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End	2.00%	2.06%

States the interest rate applicable to Federal Home Loan Bank advances outstanding as of the Balance Sheet date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

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Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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