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Premises and Equipment - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property Plant And Equipment [Abstract]      
Depreciation $ 1,946us-gaap_Depreciation $ 786us-gaap_Depreciation $ 568us-gaap_Depreciation
Rent expense $ 1,771us-gaap_LeaseAndRentalExpense $ 963us-gaap_LeaseAndRentalExpense $ 690us-gaap_LeaseAndRentalExpense