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Fair Value of Financial Instruments - Summary of Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Assets    
Cash and due from banks $ 43,857 $ 43,476
Investment securities, held to maturity 162,661 165,767
Loans held for sale 7,677 6,143
Loans excluding loan level hedges, net 1,506,831 1,365,885
Stock in FHLB and FRB 11,080 11,348
Interest receivable 8,823 8,246
Liabilities    
Non-interest bearing deposits 307,215 267,667
Subordinated debentures 32,719 32,642
Interest payable 461 497
Carrying Amount [Member]    
Assets    
Cash and due from banks 43,857 43,476
Investment securities, held to maturity 162,661 165,767
Loans held for sale 7,677 6,143
Loans excluding loan level hedges, net 1,393,414 1,260,608
Stock in FHLB and FRB 11,080 11,348
Interest receivable 8,823 8,246
Liabilities    
Non-interest bearing deposits 307,215 267,667
Interest-bearing deposits 1,277,508 1,214,652
Borrowings 385,236 351,198
Subordinated debentures 32,719 32,642
Interest payable 461 497
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Assets    
Cash and due from banks 43,857 43,476
Liabilities    
Non-interest bearing deposits 307,215 267,667
Significant Other Observable Inputs (Level 2) [Member]    
Assets    
Investment securities, held to maturity 167,581 169,904
Stock in FHLB and FRB 11,080 11,348
Interest receivable 8,823 8,246
Liabilities    
Interest-bearing deposits 1,204,516 1,158,912
Borrowings 381,302 348,597
Subordinated debentures 32,698 32,669
Interest payable 461 497
Significant Unobservable Inputs (Level 3) [Member]    
Assets    
Loans held for sale 7,677 6,143
Loans excluding loan level hedges, net $ 1,426,252 $ 1,295,133