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Fair Value of Financial Instruments - Summary of Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets
Cash and due from banks	$ 70,832	$ 48,650
Investment securities, held to maturity	193,194	187,629
Loans held for sale	8,087	7,917
Loans excluding loan level hedges, net	2,127,894	1,739,713
Stock in FHLB and FRB	23,932	13,823
Interest receivable	12,713	10,535
Liabilities
Non-interest bearing deposits	496,248	335,955
Interest-bearing deposits	1,974,962	1,544,198
Borrowings	267,489	449,347
Subordinated debentures	37,456	32,797
Interest payable	472	507
Carrying Amount [Member]
Assets
Cash and due from banks	70,832	48,650
Investment securities, held to maturity	193,194	187,629
Loans held for sale	8,087	7,917
Loans excluding loan level hedges, net	1,998,804	1,619,125
Stock in FHLB and FRB	23,932	13,823
Interest receivable	12,713	10,535
Liabilities
Non-interest bearing deposits	496,248	335,955
Interest-bearing deposits	1,974,962	1,544,198
Borrowings	267,489	449,347
Subordinated debentures	37,456	32,797
Interest payable	472	507
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets
Cash and due from banks	70,832	48,650
Liabilities
Non-interest bearing deposits	496,248	335,955
Significant Other Observable Inputs (Level 2) [Member]
Assets
Investment securities, held to maturity	194,086	193,703
Stock in FHLB and FRB	23,932	13,823
Interest receivable	12,713	10,535
Liabilities
Interest-bearing deposits	1,839,167	1,461,314
Borrowings	261,141	441,547
Subordinated debentures	36,371	32,996
Interest payable	472	507
Significant Unobservable Inputs (Level 3) [Member]
Assets
Loans held for sale	8,087	7,917
Loans excluding loan level hedges, net	$ 1,965,928	$ 1,703,506

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