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Deposits - Components of interest expense recognized on interest-bearing deposits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Interest expense recognized on interest-bearing deposits      
Savings $ 30 $ 32 $ 40
Money market 141 174 229
NOW accounts 231 209 251
Time certificates of deposit 546 645 750
Total interest expense recognized $ 948 $ 1,060 $ 1,270