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Fair Value Measurement - Carrying Amount and Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Jan. 04, 2016
Financial Assets:
Cash and due from financial institutions	$ 39,515	$ 36,695	$ 41,772	$ 35,561
Securities available for sale	230,197	195,864
Other securities	14,225	14,055
Loans, net of allowance for loan losses	1,087,770	1,042,201
Bank owned life insurance	24,839	24,552
Accrued interest receivable	3,928	3,854
Financial Liabilities:
Securities sold under agreement to repurchase	12,730	28,925
Carrying Amount [Member]
Financial Assets:
Cash and due from financial institutions	39,515	36,695
Securities available for sale	230,197	195,864
Other securities	14,225	14,055
Loans, held for sale	4,728	2,268
Loans, net of allowance for loan losses	1,087,770	1,042,201
Bank owned life insurance	24,839	24,552
Accrued interest receivable	3,928	3,854
Swap asset	1,706
Swap asset		1,839
Financial Liabilities:
Nonmaturing deposits	975,116	913,677
Time deposits	189,772	207,426
Short-term FHLB advances	48,300	31,000
Long-term FHLB advances	15,000	17,500
Securities sold under agreement to repurchase	12,730	28,925
Subordinated debentures	29,427	29,427
Accrued interest payable	101	181
Swap liability	1,706
Swap liability		1,839
Total Fair Value [Member]
Financial Assets:
Cash and due from financial institutions	39,515	36,695
Securities available for sale	230,197	195,864
Other securities	14,225	14,055
Loans, held for sale	4,728	2,268
Loans, net of allowance for loan losses	1,088,242	1,047,329
Bank owned life insurance	24,839	24,552
Accrued interest receivable	3,928	3,854
Swap asset	1,706
Swap asset		1,839
Financial Liabilities:
Nonmaturing deposits	975,116	913,677
Time deposits	189,807	207,784
Short-term FHLB advances	48,300	31,007
Long-term FHLB advances	14,987	17,553
Securities sold under agreement to repurchase	12,730	28,925
Subordinated debentures	29,378	27,414
Accrued interest payable	101	181
Swap liability	1,706	1,839
(Level 1) [Member]
Financial Assets:
Cash and due from financial institutions	39,515	36,695
Other securities	14,225	14,055
Loans, held for sale	4,728	2,268
Bank owned life insurance	24,839	24,552
Accrued interest receivable	3,928	3,854
Financial Liabilities:
Nonmaturing deposits	975,116	913,677
Short-term FHLB advances	48,300	31,007
Securities sold under agreement to repurchase	12,730	28,925
Accrued interest payable	101	181
(Level 2) [Member]
Financial Assets:
Securities available for sale	230,197	195,864
Swap asset	1,706
Swap asset		1,839
Financial Liabilities:
Swap liability	1,706	1,839
(Level 3) [Member]
Financial Assets:
Loans, net of allowance for loan losses	1,088,242	1,047,329
Financial Liabilities:
Time deposits	189,807	207,784
Long-term FHLB advances	14,987	17,553
Subordinated debentures	$ 29,378	$ 27,414

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The carrying amount of non maturing deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits and negotiable orders of withdrawal (NOW).

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