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Fair Value of Financial Instruments - Summary of Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Assets    
Cash and due from banks $ 47,612 $ 48,650
Investment securities, held to maturity 180,291 187,629
Loans held for sale 3,168 7,917
Loans excluding loan level hedges, net 1,710,824 1,739,713
Stock in FHLB and FRB 13,823 13,823
Interest receivable 10,476 10,535
Liabilities    
Non-interest bearing deposits 343,025 335,955
Subordinated debentures 32,836 32,797
Interest payable 580 507
Carrying Amount [Member]    
Assets    
Cash and due from banks 47,612 48,650
Investment securities, held to maturity 180,291 187,629
Loans held for sale 3,168 7,917
Loans excluding loan level hedges, net 1,594,999 1,619,125
Stock in FHLB and FRB 13,823 13,823
Interest receivable 10,476 10,535
Liabilities    
Non-interest bearing deposits 343,025 335,955
Interest-bearing deposits 1,535,454 1,544,198
Borrowings 430,507 449,347
Subordinated debentures 32,836 32,797
Interest payable 580 507
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Assets    
Cash and due from banks 47,612 48,650
Liabilities    
Non-interest bearing deposits 343,025 335,955
Significant Other Observable Inputs (Level 2) [Member]    
Assets    
Investment securities, held to maturity 188,093 193,703
Stock in FHLB and FRB 13,823 13,823
Interest receivable 10,476 10,535
Liabilities    
Interest-bearing deposits 1,483,711 1,461,314
Borrowings 426,966 441,547
Subordinated debentures 33,003 32,996
Interest payable 580 507
Significant Unobservable Inputs (Level 3) [Member]    
Assets    
Loans held for sale 3,168 7,917
Loans excluding loan level hedges, net $ 1,584,414 $ 1,703,506