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Note 7 - Federal Home Loan Bank of Indianapolis Advances (Details Textual) - USD ($)
1 Months Ended 9 Months Ended
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Long-term Federal Home Loan Bank Advances, Total   $ 394,000,000   $ 354,000,000
Payments of FHLBank Borrowings, Financing Activities   20,000,000 $ 30,000,000  
Line of Credit Facility, Maximum Borrowing Capacity   737,000,000    
Line of Credit Facility, Remaining Borrowing Capacity   337,000,000    
Federal Home Loan Bank of Indianapolis [Member]        
Long-term Federal Home Loan Bank Advances, Total   $ 394,000,000   $ 354,000,000
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Repayment and Penalties $ 900,000      
Federal Home Loan Bank of Indianapolis [Member] | Federal Home Loan Bank Advances With Maturities From August 2020 to October 2021 [Member]        
Payments of FHLBank Borrowings, Financing Activities 70,000,000.0      
Federal Home Loan Bank of Indianapolis [Member] | Federal Home Loan Bank Advances With Maturities From June 2024 to June 2027 [Member]        
Proceeds from FHLBank Borrowings, Financing Activities $ 70,000,000.0      
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End, Embedded Prepayment Fees 0.22%      
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%   1.36%
Federal Home Loan Bank of Indianapolis [Member] | Minimum [Member] | Federal Home Loan Bank Advances With Maturities From August 2020 to October 2021 [Member]        
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End 1.36%      
Federal Home Loan Bank of Indianapolis [Member] | Minimum [Member] | Federal Home Loan Bank Advances With Maturities From June 2024 to June 2027 [Member]        
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End 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] | Maximum [Member] | Federal Home Loan Bank Advances With Maturities From August 2020 to October 2021 [Member]        
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End 2.84%      
Federal Home Loan Bank of Indianapolis [Member] | Maximum [Member] | Federal Home Loan Bank Advances With Maturities From June 2024 to June 2027 [Member]        
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End 1.18%      
Federal Home Loan Bank of Indianapolis [Member] | Weighted Average [Member]        
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End   2.06%    
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate       2.45%
Federal Home Loan Bank of Indianapolis [Member] | Weighted Average [Member] | Federal Home Loan Bank Advances With Maturities From August 2020 to October 2021 [Member]        
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End 1.97%      
Federal Home Loan Bank of Indianapolis [Member] | Weighted Average [Member] | Federal Home Loan Bank Advances With Maturities From June 2024 to June 2027 [Member]        
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End 0.84%