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Fair Value Measurements and Fair Values of Financial Instruments - Estimated Fair Values of Riverview's Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Financial assets:        
Cash and cash equivalents $ 14,799 $ 21,697 $ 14,854 $ 14,580
Interest-bearing time deposits   991    
Mortgage loans held for sale 318 1,094    
Loans, net 394,884 405,480    
Accrued interest receivable 1,586 1,594    
Restricted investments in bank stocks 588 2,315    
Financial liabilities:        
Deposits 461,447 448,342    
Short-term borrowings 4,069 42,575    
Long-term borrowings 11,335 9,350    
Accrued interest payable 221 236    
Carrying Amount [Member]        
Financial assets:        
Cash and cash equivalents 14,799 21,697    
Interest-bearing time deposits   991    
Investment securities 74,253 75,850    
Mortgage loans held for sale 318 1,094    
Loans, net 394,884 405,480    
Accrued interest receivable 1,586 1,594    
Restricted investments in bank stocks 588 2,315    
Financial liabilities:        
Deposits 461,447 448,342    
Short-term borrowings 4,069 42,275    
Long-term borrowings 11,335 9,350    
Accrued interest payable 221 236    
Off balance sheet financial instruments 0 0    
Fair Value [Member]        
Financial assets:        
Cash and cash equivalents 14,799 21,697    
Interest-bearing time deposits   991    
Investment securities 74,253 75,850    
Mortgage loans held for sale 318 1,094    
Loans, net 398,827 411,521    
Accrued interest receivable 1,586 1,594    
Restricted investments in bank stocks 588 2,315    
Financial liabilities:        
Deposits 467,865 441,413    
Short-term borrowings 4,070 42,275    
Long-term borrowings 11,317 9,343    
Accrued interest payable 221 236    
Off balance sheet financial instruments 0 0    
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]        
Financial assets:        
Cash and cash equivalents 14,799 21,697    
Interest-bearing time deposits   991    
Investment securities 180 499    
Accrued interest receivable 1,586 1,594    
Financial liabilities:        
Accrued interest payable 221 236    
Off balance sheet financial instruments 0 0    
Significant Other Observable Inputs (Level 2) [Member]        
Financial assets:        
Investment securities 74,073 75,351    
Mortgage loans held for sale 318 1,094    
Loans, net 398,827 411,428    
Financial liabilities:        
Deposits 467,865 441,413    
Short-term borrowings 4,070 42,275    
Long-term borrowings 11,317 9,343    
Off balance sheet financial instruments 0 0    
Significant Unobservable Inputs (Level 3) [Member]        
Financial assets:        
Loans, net   93    
Restricted investments in bank stocks 588 2,315    
Financial liabilities:        
Off balance sheet financial instruments $ 0 $ 0