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Fair Value of Financial Instruments - Summary of Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Assets    
Cash and due from banks $ 48,155 $ 43,476
Investment securities, held to maturity 182,187 165,767
Loans held for sale 5,583 6,143
Loans excluding loan level hedges, net 1,717,779 1,365,885
Stock in FHLB and FRB 13,823 11,348
Interest receivable 10,862 8,246
Liabilities    
Non-interest bearing deposits 338,436 267,667
Subordinated debentures 32,758 32,642
Interest payable 490 497
Carrying Amount [Member]    
Assets    
Cash and due from banks 48,155 43,476
Investment securities, held to maturity 182,187 165,767
Loans held for sale 5,583 6,143
Loans excluding loan level hedges, net 1,598,233 1,260,608
Stock in FHLB and FRB 13,823 11,348
Interest receivable 10,862 8,246
Liabilities    
Non-interest bearing deposits 338,436 267,667
Interest-bearing deposits 1,574,639 1,214,652
Borrowings 373,901 351,198
Subordinated debentures 32,758 32,642
Interest payable 490 497
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Assets    
Cash and due from banks 48,155 43,476
Liabilities    
Non-interest bearing deposits 338,436 267,667
Significant Other Observable Inputs (Level 2) [Member]    
Assets    
Investment securities, held to maturity 188,574 169,904
Stock in FHLB and FRB 13,823 11,348
Interest receivable 10,862 8,246
Liabilities    
Interest-bearing deposits 1,494,112 1,158,912
Borrowings 372,971 348,597
Subordinated debentures 33,334 32,669
Interest payable 490 497
Significant Unobservable Inputs (Level 3) [Member]    
Assets    
Loans held for sale 5,583 6,143
Loans excluding loan level hedges, net $ 1,641,840 $ 1,295,133