Borrowings (Detail Textuals 2) (USD $)	1 Months Ended
	Mar. 26, 2003	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Amount of fixed/floating rate junior subordinated deferrable interest debentures from the company		$ 54,872,000	$ 49,717,000
Junior subordinated deferrable interest debentures
Debt Instrument [Line Items]
Amount of fixed/floating rate junior subordinated deferrable interest debentures from the company		7,217,000	7,217,000
RIVR Statutory Trust I
Debt Instrument [Line Items]
Proceeds from issue of capital and common securities	7,217,000
Tenure for debentures, capital and common securities issued	30 years
RIVR Statutory Trust I | Junior subordinated deferrable interest debentures
Debt Instrument [Line Items]
Amount of fixed/floating rate junior subordinated deferrable interest debentures from the company	7,217,000
Description of interest rate on debentures issued	Fixed/Floating interest at the annual rate of 6.4% for five years and thereafter bear interest at the rate of the 3-Month LIBOR plus 3.15%
Annual interest rate for five years	6.40%
Description of variable interest rate	3-Month LIBOR
Basis spread added to reference rate	3.15%
RIVR Statutory Trust I | Capital Units
Debt Instrument [Line Items]
Number of shares issued	7,000
Liquidation amount per security issued	$ 1,000
Aggregate amount of shares issued	7,000,000
RIVR Statutory Trust I | Common Stock
Debt Instrument [Line Items]
Number of shares issued	217
Liquidation amount per security issued	$ 1,000
Aggregate amount of shares issued	$ 217,000