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Note 17 - Fair Values of Financial Instruments (Details) - Fair Value Hierarchy of Financial Instruments - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Financial assets    
Securities available for sale $ 346,992,000 $ 432,912,000
Federal Home Loan Bank stock [1] 7,567,000 13,699,000
Federal Home Loan Bank stock [1] 7,567,000 13,699,000
Bank owned life insurance 58,971,000 57,861,000
Financial liabilities    
Deposits 2,275,382,000 2,276,915,000
Securities sold under agreements to repurchase 154,771,000 167,569,000
Accrued interest payable 16,445,000 12,263,000
Interest Rate Swap [Member]    
Financial liabilities    
Interest rate swap [2] 253,000 253,000
Interest rate swap [2] 253,000 253,000
Fair Value, Inputs, Level 1 [Member]    
Financial assets    
Cash 12,496,000 13,261,000
Cash 12,496,000 13,261,000
Securities available for sale 0  
Fair Value, Inputs, Level 2 [Member]    
Financial assets    
Cash equivalents 77,395,000 159,477,000
Cash equivalents 77,395,000 159,477,000
Bank owned life insurance 58,971,000 57,861,000
Bank owned life insurance 58,971,000 57,861,000
Accrued interest receivable 7,836,000 8,033,000
Accrued interest receivable 7,836,000 8,033,000
Financial liabilities    
Deposits 2,275,382,000 2,276,915,000
Deposits 2,208,724,000 2,254,749,000
Securities sold under agreements to repurchase 154,771,000 167,569,000
Securities sold under agreements to repurchase 154,771,000 167,569,000
Federal Home Loan Bank advances 68,000,000 54,022,000
Federal Home Loan Bank advances 68,858,000 54,720,000
Subordinated debentures 55,154,000 54,472,000
Subordinated debentures 55,760,000 54,508,000
Accrued interest payable 1,479,000 1,942,000
Accrued interest payable 1,479,000 1,942,000
Fair Value, Inputs, Level 3 [Member]    
Financial assets    
Loans, net 2,262,046,000 2,069,236,000
Loans, net $ 2,261,026,000 $ 2,064,140,000
[1] It is not practical to determine the fair value of FHLBI stock due to transferability restrictions.
[2] See Note 18 for a description of the fair value hierarchy as well as a disclosure of levels for classes of financial assets and liabilities.