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Securities (Tables)
6 Months Ended
Jun. 30, 2016
Securities [Abstract]  
Book values and approximate fair values of investment securities
    June 30, 2016     December 31, 2015  
    Amortized     Fair     Unrealized     Amortized     Fair     Unrealized  
($ in thousands)   Cost     Value     Gains     (Losses)     Cost     Value     Gains     (Losses)  
                                                 
Securities available for sale:                                                                
  Government-sponsored enterprise securities   $ 16,000       15,992       2       (10 )     19,000       18,972       1       (29 )
  Mortgage-backed securities     168,103       169,256       1,437       (284 )     122,474       121,553       348       (1,269 )
  Corporate bonds     33,853       34,381       598       (70 )     25,216       24,946             (270 )
  Equity securities     83       133       58       (8 )     88       143       64       (9 )
Total available for sale   $ 218,039       219,762       2,095       (372 )     166,778       165,614       413       (1,577 )
                                                                 
Securities held to maturity:                                                                
  Mortgage-backed securities   $ 92,675       93,444       769             102,509       101,767             (742 )
  State and local governments     49,398       52,655       3,257             52,101       55,379       3,284       (6 )
Total held to maturity   $ 142,073       146,099       4,026             154,610       157,146       3,284       (748 )
Schedule of information regarding securities with unrealized losses
 ($ in thousands)   Securities in an Unrealized
Loss Position for
Less than 12 Months
    Securities in an Unrealized
Loss Position for 
More than 12 Months
    Total  
    Fair Value     Unrealized
Losses
    Fair Value     Unrealized
Losses
    Fair Value     Unrealized
Losses
 
  Government-sponsored enterprise securities   $ 9,992       7       2,997       3       12,989       10  
  Mortgage-backed securities     5,917       22       20,242       262       26,159       284  
  Corporate bonds                 930       70       930       70  
  Equity securities                 17       8       17       8  
  State and local governments                                    
      Total temporarily impaired securities   $ 15,909       29       24,186       343       40,095       372  

 

 ($ in thousands)   Securities in an Unrealized 
Loss Position for 
Less than 12 Months
    Securities in an Unrealized 
Loss Position for 
More than 12 Months
    Total  
    Fair Value     Unrealized
Losses
    Fair Value     Unrealized 
Losses
    Fair Value     Unrealized 
Losses
 
  Government-sponsored enterprise securities   $ 5,993       7       2,978       22       8,971       29  
  Mortgage-backed securities     150,853       1,148       27,460       863       178,313       2,011  
  Corporate bonds     24,006       210       940       60       24,946       270  
  Equity securities                 17       9       17       9  
  State and local governments     840       6                   840       6  
      Total temporarily impaired securities   $ 181,692       1,371       31,395       954       213,087       2,325  
Schedule of book values and approximate fair values of investment securities by contractual maturity
    Securities Available for Sale     Securities Held to Maturity  
    Amortized     Fair     Amortized     Fair  
($ in thousands)   Cost     Value     Cost     Value  
                         
Debt securities                                
Due within one year   $             1,307       1,330  
Due after one year but within five years     3,000       2,997       15,795       16,590  
Due after five years but within ten years     41,853       42,366       31,127       33,552  
Due after ten years     5,000       5,010       1,169       1,183  
Mortgage-backed securities     168,103       169,256       92,675       93,444  
Total debt securities     217,956       219,629       142,073       146,099  
                                 
Equity securities     83       133              
Total securities   $ 218,039       219,762       142,073       146,099