Note 7 - Federal Home Loan Bank of Indianapolis Advances (Details Textual) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Long-term Federal Home Loan Bank Advances, Total	$ 384,000,000	$ 350,000,000
Line of Credit Facility, Maximum Borrowing Capacity	827,000,000
Line of Credit Facility, Remaining Borrowing Capacity	437,000,000
Federal Home Loan Bank of Indianapolis [Member]
Long-term Federal Home Loan Bank Advances, Total	$ 384,000,000	$ 350,000,000
Federal Home Loan Bank of Indianapolis [Member] \| Minimum [Member]
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End	1.20%	1.20%
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, Branch of FHLB Bank, Interest Rate	2.37%	2.30%

Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
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States the interest rate applicable to Federal Home Loan Bank advances outstanding as of the Balance Sheet date.

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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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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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