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Fair Value of Financial Instruments - Summary of Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Assets    
Cash and due from banks $ 69,018 $ 76,441
Investment securities, held to maturity 209,767 200,448
Loans held for sale 3,000 3,094
Loans (excluding loan level hedges), net 2,916,508 2,824,827
Stock in FHLB 18,105 18,105
Interest receivable 12,993 16,244
Liabilities    
Non-interest bearing deposits 615,018 601,805
Interest bearing deposits 2,401,145 2,279,198
Borrowings 524,846 564,157
Subordinated debentures 37,745 37,653
Interest payable 1,441 886
Carrying Amount [Member]    
Assets    
Cash and due from banks 69,018 76,441
Investment securities, held to maturity 209,767 200,448
Loans held for sale 3,000 3,094
Loans (excluding loan level hedges), net 2,751,703 2,661,026
Stock in FHLB 18,105 18,105
Interest receivable 12,993 16,244
Liabilities    
Non-interest bearing deposits 615,018 601,805
Interest bearing deposits 2,401,145 2,279,198
Borrowings 524,846 564,157
Subordinated debentures 37,745 37,653
Interest payable 1,441 886
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Assets    
Cash and due from banks 69,018 76,441
Liabilities    
Non-interest bearing deposits 615,018 601,805
Significant Other Observable Inputs (Level 2) [Member]    
Assets    
Investment securities, held to maturity 206,730 201,085
Stock in FHLB 18,105 18,105
Interest receivable 12,993 16,244
Liabilities    
Interest bearing deposits 2,263,817 2,156,487
Borrowings 520,701 560,057
Subordinated debentures 35,682 35,994
Interest payable 1,441 886
Significant Unobservable Inputs (Level 3) [Member]    
Assets    
Loans held for sale 3,000 3,094
Loans (excluding loan level hedges), net $ 2,585,501 $ 2,585,879