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Borrowings - Maturities and Weighted Average Rates (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Scheduled maturities and weighted average rates of borrowings    
Year one $ 49,070 $ 66,036
Year three 45,500 45,500
Thereafter 58,378 58,378
Total $ 152,948 $ 169,914
Weighted Average Rate    
Year one (as a percent) 0.06% 0.09%
Year three (as a percent) 1.82% 1.75%
Thereafter (as a percent) 7.35% 7.35%
Total (as a percent) 3.37% 3.03%