Income Taxes - Components of Deferred Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred income tax assets:    
Loans and allowance for loan losses $ 4,471 $ 2,501
Accrued expenses 106 107
Operating loss carryforwards and credits 7,037 3,260
Premises and equipment 283 672
Capital loss carryforward   14
Non-accrual interest income 31 75
Stock-based compensation 479 347
Other real estate 99 32
Investment in pass through entity 208  
Other 157 164
Total gross deferred income tax assets 12,871 7,172
Less valuation allowance   (12)
Net deferred income tax assets 12,871 7,160
Deferred income tax liabilities:    
Unrealized gains on investment securities available-for-sale 455 156
Prepaid expenses 182 154
Core deposit intangible 668  
Goodwill 122  
Leases   93
Total gross deferred income tax liabilities 1,427 403
Net deferred income tax assets $ 11,444 $ 6,757