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Fair Value Measurements - Carrying Values and Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Financial Assets    
Securities available for sale, at fair value $ 89,741 $ 94,802 [1]
Securities held to maturity 50,824 53,398 [1]
Restricted securities 1,570 1,548 [1]
Bank owned life insurance 14,115 13,928 [1]
Accrued interest receivable 1,728 1,746 [1]
Carrying Amount    
Financial Assets    
Cash and short-term investments 50,738 41,092
Securities available for sale, at fair value 89,741 94,802
Securities held to maturity 50,824 53,398
Restricted securities 1,570 1,548
Loans held for sale 999 337
Loans, net 498,389 480,746
Bank owned life insurance 14,115 13,928
Accrued interest receivable 1,728 1,746
Financial Liabilities    
Deposits 661,828 645,570
Subordinated debt 4,939 4,930
Junior subordinated debt 9,279 9,279
Accrued interest payable 87 95
Fair Value    
Financial Assets    
Cash and short-term investments 50,738 41,092
Securities available for sale, at fair value 89,741 94,802
Securities held to maturity 51,001 52,709
Restricted securities 1,570 1,548
Loans held for sale 999 337
Loans, net 499,030 481,475
Bank owned life insurance 14,115 13,928
Accrued interest receivable 1,728 1,746
Financial Liabilities    
Deposits 660,706 644,322
Subordinated debt 4,753 4,715
Junior subordinated debt 9,472 9,075
Accrued interest payable 87 95
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value    
Financial Assets    
Cash and short-term investments 50,738 41,092
Securities available for sale, at fair value 12 11
Securities held to maturity 0 0
Restricted securities 0 0
Loans held for sale 0 0
Loans, net 0 0
Bank owned life insurance 0 0
Accrued interest receivable 0 0
Financial Liabilities    
Deposits 0 0
Subordinated debt 0 0
Junior subordinated debt 0 0
Accrued interest payable 0 0
Significant Other Observable Inputs (Level 2) | Fair Value    
Financial Assets    
Cash and short-term investments 0 0
Securities available for sale, at fair value 89,729 94,791
Securities held to maturity 49,511 51,223
Restricted securities 1,570 1,548
Loans held for sale 999 337
Loans, net 0 0
Bank owned life insurance 14,115 13,928
Accrued interest receivable 1,728 1,746
Financial Liabilities    
Deposits 538,908 517,143
Subordinated debt 0 0
Junior subordinated debt 0 0
Accrued interest payable 87 95
Significant Unobservable Inputs (Level 3) | Fair Value    
Financial Assets    
Cash and short-term investments 0 0
Securities available for sale, at fair value 0 0
Securities held to maturity 1,490 1,486
Restricted securities 0 0
Loans held for sale 0 0
Loans, net 499,030 481,475
Bank owned life insurance 0 0
Accrued interest receivable 0 0
Financial Liabilities    
Deposits 121,798 127,179
Subordinated debt 4,753 4,715
Junior subordinated debt 9,472 9,075
Accrued interest payable $ 0 $ 0
[1] Derived from audited consolidated financial statements.