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Note 10 - Fair Values of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
Level in
   
June 30, 2018
   
December 31, 2017
 
   
Fair Value
Hierarchy
   
Carrying
Values
   
Fair
Values
   
Carrying
Values
   
Fair
Values
 
                                        
Financial assets:
                                      
Cash
 
Level 1
    $
11,471
    $
11,471
    $
11,565
    $
11,565
 
Cash equivalents
 
Level 2
     
114,269
     
114,269
     
188,536
     
188,536
 
Securities available for sale
 
 (1)
     
331,142
     
331,142
     
335,744
     
335,744
 
FHLBI stock
 
 (2)
     
11,036
     
11,036
     
11,036
     
11,036
 
Loans, net
 
Level 3
     
2,612,626
     
2,611,383
     
2,536,498
     
2,520,063
 
Loans held for sale
 
Level 2
     
3,063
     
3,063
     
2,553
     
2,553
 
Mortgage servicing rights
 
Level 2
     
4,722
     
7,911
     
5,106
     
8,373
 
Accrued interest receivable
 
Level 2
     
9,260
     
9,260
     
8,770
     
8,770
 
                                        
Financial liabilities:
                                      
Deposits
 
Level 2
     
2,529,811
     
2,337,790
     
2,522,365
     
2,368,188
 
Repurchase agreements
 
Level 2
     
94,573
     
94,573
     
118,748
     
118,748
 
FHLBI advances
 
Level 2
     
230,000
     
223,073
     
220,000
     
217,130
 
Subordinated debentures
 
Level 2
     
45,858
     
46,235
     
45,517
     
45,732
 
Accrued interest payable
 
Level 2
     
1,853
     
1,853
     
1,919
     
1,919
 
Interest rate swap
 
 (1)
     
0
     
0
     
2
     
2