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Other comprehensive income (loss) - Other Comprehensive Income (Loss) and Related Tax Effects (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Other comprehensive income (loss)        
Unrealized gain (loss) on investment securities available-for-sale $ 1,128 $ (1,459) $ 2,123 $ (692)
Net gain on the sale of investment securities available-for-sale(1) (381)   (623) (832)
Other comprehensive income (loss) gain before taxes 747 (1,459) 1,500 (1,524)
Income tax 261 (510) 525 (533)
Other comprehensive income (loss) $ 486 $ (949) $ 975 $ (991)