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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2017
Income Taxes [Abstract]  
Summary of components of income tax expense
  
 For the years ended December 31, 
(dollars in thousands)       2017     2016     2015
Current income taxes:
Federal$7,1396,4296,184
State573548441
Total current tax expense7,7126,9776,625
Deferred income tax expense (benefit)2,904356(1,256)
Income tax expense$10,6167,3335,369
Summary of taxes computed using the statutory tax rate
   
For the years ended December 31,
(dollars in thousands)     2017     2016     2015
Tax expense at statutory rate$8,2817,1295,438
Effect of state income taxes, net of federal benefit372356287
Exempt income(146)(162)(151)
Effect of change in federal tax rate2,441--
Other(332)10(205)
Income tax expense$10,6167,3335,369
Summary of components of the deferred tax assets and liabilities
  
December 31,
(dollars in thousands)                      2017       2016
Deferred tax assets:
Allowance for loan losses$3,2605,199
Unrealized loss on securities available for sale121260
Net deferred loan fees480691
Deferred compensation1,1241,597
Sale of real estate owned104262
Accrued expenses16401
Other136250
 5,2418,660
Deferred tax liabilities:
Property and equipment1,2081,467
Hedging transactions88-
Other163368
1,4591,835
Net deferred tax asset$3,7826,825