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Fair Value Measurements - Estimated Fair Value of the Company's Financial Instruments (Detail) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash and cash equivalents $ 23,276,000 $ 23,750,000 $ 23,295,000 $ 25,639,000 $ 26,193,000 $ 45,346,000
Cash and cash equivalents, fair value 23,276,000 23,750,000   25,639,000    
Available for sale, fair value 123,054,000 146,520,000   154,334,000    
Loans held for sale 880,000 1,107,000   438,000    
Loans held for sale, fair value 880,000 1,107,000   438,000    
Net loans 579,995,000 527,325,000   463,738,000    
Net loans, fair value 586,739,000 534,021,000   475,019,000    
Bank-owned life insurance 13,438,000 13,141,000   9,092,000    
Federal Home Loan Bank stock 1,887,000 1,887,000   1,887,000    
Accrued interest receivable 2,526,000 2,387,000   2,095,000    
Deposits 639,342,000 624,447,000   586,112,000    
Deposits, fair value 643,095,000 624,973,000   586,796,000    
Short-term borrowings 32,803,000 35,825,000   14,808,000    
Short-term borrowings, fair value 32,803,000 35,825,000   14,808,000    
Other borrowings 9,713,000 9,939,000   10,624,000    
Other borrowings, fair value 10,003,000 10,063,000   10,822,000    
Accrued interest payable 391,000 395,000   315,000    
Scenario, Previously Reported [Member]            
Available for sale, fair value   146,520,000        
Fair Value, Inputs, Level 1 [Member]            
Cash and cash equivalents 23,276,000 23,750,000   25,639,000    
Available for sale, fair value 5,000 5,000        
Bank-owned life insurance 13,438,000 13,141,000   9,092,000    
Federal Home Loan Bank stock 1,887,000 1,887,000   1,887,000    
Accrued interest receivable 2,526,000 2,387,000   2,095,000    
Deposits 454,427,000 433,226,000   416,254,000    
Short-term borrowings 32,803,000 35,825,000   14,808,000    
Accrued interest payable 391,000 395,000   315,000    
Fair Value, Inputs, Level 2 [Member]            
Available for sale, fair value 123,049,000 146,515,000   154,334,000    
Loans held for sale 880,000 1,107,000   438,000    
Fair Value, Inputs, Level 2 [Member] | Scenario, Previously Reported [Member]            
Available for sale, fair value   146,520,000        
Fair Value, Inputs, Level 3 [Member]            
Available for sale, fair value 0 0        
Net loans 586,739,000 534,021,000   475,019,000    
Deposits 188,668,000 191,747,000   170,542,000    
Other borrowings $ 10,003,000 $ 10,063,000   $ 10,822,000