Borrowings (Tables)
 3 Months Ended
Mar. 31, 2018
Borrowings [Abstract]  
Borrowings
Borrowings consist of the following:

  
March 31, 2018
  
December 31, 2017
 
  
Balance
  
Weighted Average Rate
  
Balance
  
Weighted Average Rate
 
  
(Dollars in Thousands)
 
Short term:
            
Repurchase agreement
 
$
19,365
   
4.63
%
 
$
11,285
   
4.32
%
Federal Home Loan Bank, Chicago advances
  
10,000
   
1.80
%
  
35,000
   
1.28
%
                 
Long term:
                
  Federal Home Loan Bank, Chicago advances maturing:
                
 2018
  
50,000
   
3.04
%
  
65,000
   
2.97
%
 2021
  
100,000
   
0.78
%
  
100,000
   
0.78
%
 2027
  
175,000
   
1.38
%
  
175,000
   
1.38
%
 2028
  
80,000
   
2.24
%
  
-
   
-
 
  
$
$ 434,365
   
1.61
%
 
$
$ 386,285
   
1.57
%