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Note 9 - Fair Values of Financial Instruments - Fair Value Hierarchy of Financial Instruments (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Securities available for sale $ 347,924,000 $ 337,366,000
Reported Value Measurement [Member]    
Securities available for sale [1] 347,924,000 337,366,000
FHLBI stock [2] 18,002,000 16,022,000
Estimate of Fair Value Measurement [Member]    
Securities available for sale [1] 347,924,000 337,366,000
FHLBI stock [2] 18,002,000 16,022,000
Fair Value, Inputs, Level 1 [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]    
Cash 14,055,000 15,656,000
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Cash 14,055,000 15,656,000
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
Cash equivalents 136,370,000 59,698,000
Loans held for sale 4,500,000 1,122,000
Mortgage servicing rights 4,201,000 4,436,000
Accrued interest receivable 10,430,000 9,896,000
Deposits 2,619,209,000 2,463,708,000
Repurchase agreements 119,669,000 103,519,000
FHLBI advances 374,000,000 350,000,000
Subordinated debentures 46,540,000 46,199,000
Accrued interest payable 3,989,000 2,249,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Cash equivalents 136,370,000 59,698,000
Loans held for sale 4,500,000 1,122,000
Mortgage servicing rights 7,239,000 8,444,000
Accrued interest receivable 10,430,000 9,896,000
Deposits 2,516,965,000 2,471,617,000
Repurchase agreements 119,669,000 103,519,000
FHLBI advances 380,720,000 348,428,000
Subordinated debentures 46,248,000 46,543,000
Accrued interest payable 3,989,000 2,249,000
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Loans, net 2,852,940,000 2,729,583,000
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Loans, net $ 2,876,906,000 $ 2,711,687,000
[1] See Note 11 for a description of the fair value hierarchy as well as a disclosure of levels for classes of financial assets and liabilities.
[2] It is not practical to determine the fair value of FHLBI stock due to transferability restrictions; therefore, fair value is estimated at carrying amount.