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Securities (Tables)
6 Months Ended
Jun. 30, 2018
Securities [Abstract]  
Book values and approximate fair values of investment securities

The book values and approximate fair values of investment securities at June 30, 2018 and December 31, 2017 are summarized as follows:

 

   June 30, 2018   December 31, 2017 
   Amortized   Fair   Unrealized   Amortized   Fair   Unrealized 
($ in thousands)  Cost   Value   Gains   (Losses)   Cost   Value   Gains   (Losses) 
                                 
Securities available for sale:                                        
  Government-sponsored enterprise securities  $19,000    18,537        (463)   14,000    13,867        (133)
  Mortgage-backed securities   292,809    282,287    48    (10,570)   297,690    295,213    246    (2,722)
  Corporate bonds   33,772    33,244    64    (592)   33,792    34,190    512    (114)
Total available for sale  $345,581    334,068    112    (11,625)   345,482    343,270    758    (2,969)
                                         
Securities held to maturity:                                        
  Mortgage-backed securities  $57,807    55,832        (1,975)   63,829    63,092        (737)
  State and local governments   50,458    51,236    836    (58)   54,674    55,906    1,280    (48)
Total held to maturity  $108,265    107,068    836    (2,033)   118,503    118,998    1,280    (785)
Schedule of information regarding securities with unrealized losses

The following table presents information regarding securities with unrealized losses at June 30, 2018:

 

($ 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  $15,615    385    2,922    78    18,537    463 
  Mortgage-backed securities   224,713    8,050    110,958    4,495    335,671    12,545 
  Corporate bonds   25,697    530    938    62    26,635    592 
  State and local governments   9,360    58            9,360    58 
      Total temporarily impaired securities  $275,385    9,023    114,818    4,635    390,203    13,658 

 

The following table presents information regarding securities with unrealized losses at December 31, 2017:

 

($ 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  $10,897    103    2,970    30    13,867    133 
  Mortgage-backed securities   192,702    1,582    125,060    1,877    317,762    3,459 
  Corporate bonds   2,500    49    935    65    3,435    114 
  State and local governments   7,928    48            7,928    48 
      Total temporarily impaired securities  $214,027    1,782    128,965    1,972    342,992    3,754 
Schedule of book values and approximate fair values of investment securities by contractual maturity

The book values and approximate fair values of investment securities at June 30, 2018, by contractual maturity, are summarized in the table below. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.

 

   Securities Available for Sale   Securities Held to Maturity 
   Amortized   Fair   Amortized   Fair 
($ in thousands)  Cost   Value   Cost   Value 
                 
Securities                    
Due within one year  $        3,248    3,276 
Due after one year but within five years   40,227    39,324    28,348    28,815 
Due after five years but within ten years   7,545    7,460    17,066    17,355 
Due after ten years   5,000    4,997    1,796    1,790 
Mortgage-backed securities   292,809    282,287    57,807    55,832 
Total securities  $345,581    334,068    108,265    107,068