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DERIVATIVE FINANCIAL INSTRUMENTS - Interest rate contracts not designated as hedging instruments (Details) - Not designated - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
DERIVATIVE FINANCIAL INSTRUMENTS      
Gross gains   $ 1,169  
Gross losses   $ (1,169)  
Interest rate swap      
DERIVATIVE FINANCIAL INSTRUMENTS      
Gross gains $ 13,571    
Gross losses (13,571)    
Other assets. | Interest rate swap      
DERIVATIVE FINANCIAL INSTRUMENTS      
Derivative asset notional amount 137,216   $ 138,356
Derivative financial assets fair value 21,946   8,642
Other assets. | Commercial Borrower | Interest rate swap      
DERIVATIVE FINANCIAL INSTRUMENTS      
Derivative asset notional amount 137,216   114,140
Derivative financial assets fair value 21,946   8,532
Other assets. | Financial Institutions Borrower | Interest rate swap      
DERIVATIVE FINANCIAL INSTRUMENTS      
Derivative asset notional amount     24,216
Derivative financial assets fair value     110
Other liabilities. | Interest rate swap      
DERIVATIVE FINANCIAL INSTRUMENTS      
Derivative liability notional amount 137,216   138,356
Derivative financial liabilities fair value (21,946)   (8,642)
Other liabilities. | Commercial Borrower | Interest rate swap      
DERIVATIVE FINANCIAL INSTRUMENTS      
Derivative liability notional amount     24,216
Derivative financial liabilities fair value     (110)
Other liabilities. | Financial Institutions Borrower | Interest rate swap      
DERIVATIVE FINANCIAL INSTRUMENTS      
Derivative liability notional amount 137,216   114,140
Derivative financial liabilities fair value $ (21,946)   $ (8,532)