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DERIVATIVE FINANCIAL INSTRUMENTS - Interest rate contracts designated as cash flow hedges (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
DERIVATIVE FINANCIAL INSTRUMENTS        
Amounts of gross gain (loss) reclassified from accumulated other comprehensive income $ 24 $ 39 $ 76 $ 137
Cash flow hedge        
DERIVATIVE FINANCIAL INSTRUMENTS        
Amounts of gross gain (loss) reclassified from accumulated other comprehensive income 24 39 76 137
Cash flow hedge | Taxable loan interest income        
DERIVATIVE FINANCIAL INSTRUMENTS        
Amounts of gross gain (loss) reclassified from accumulated other comprehensive income 33 $ 39 83 $ 137
Cash flow hedge | Subordinated debentures interest expense        
DERIVATIVE FINANCIAL INSTRUMENTS        
Amounts of gross gain (loss) reclassified from accumulated other comprehensive income $ (9)   $ (7)