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Income taxes - Components of Net Deferred Tax Asset (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Deferred tax assets:    
Allowance for loan losses $ 2,940 $ 2,363
Defined benefit plan 1,359 1,438
Deferred compensation 10 1,046
Other-than-temporary impairment on securities 131 131
Merger related accounting 1,505 61
Capital loss carry forward 244  
Other 170  
Total 6,359 5,039
Deferred tax liabilities:    
Premises and equipment, net 976 479
Investment securities available-for-sale 2,220 2,331
Other 83 59
Total 3,279 2,869
Net deferred tax asset $ 3,080 $ 2,170