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Derivative instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Notional Amount $ 937,388   $ 937,388   $ 705,935
Asset Derivatives Fair Value 4,181   4,181   2,070
Liabilities Derivatives Fair Value (11,906)   (11,906)   (3,625)
Derivative gain (loss)          
Net Realized Gain (Loss) 132 $ (212) (4,068) $ 3,391  
Unrealized Gain (Loss) (2,364) 1,983 (6,171) 2,067  
Total change in OCI for period (2,614)   (9,611)    
Designated as Hedging          
Derivative gain (loss)          
Total income statement impact 169   269    
Derivatives - effective portion reclassified from AOCI to income 169   269    
Derivatives- effective portion recorded in OCI (2,783)   (9,880)    
Total change in OCI for period (2,614)   (9,611)    
Designated as Hedging | Interest Rate Risk          
Derivative gain (loss)          
Total income statement impact 169   269    
Derivatives - effective portion reclassified from AOCI to income 169   269    
Derivatives- effective portion recorded in OCI (2,783)   (9,880)    
Total change in OCI for period (2,614)   (9,611)    
Credit default swaps          
Notional Amount 15,000   15,000   15,000
Asset Derivatives Fair Value         295
Liabilities Derivatives Fair Value (57)   (57)    
Derivative gain (loss)          
Net Realized Gain (Loss)       (703)  
Unrealized Gain (Loss) 2 (121) (352) 788  
Interest Rate Swap Agreement          
Liabilities Derivatives Fair Value (11,849)   (11,849)   (3,625)
Derivative gain (loss)          
Net Realized Gain (Loss) 132 (212) (4,068) 4,094  
Unrealized Gain (Loss) (4,268) 1,919 (8,817) 801  
Interest Rate Swap Agreement | Not Designated as Hedging | Interest Rate Risk          
Notional Amount 372,426   372,426   411,811
Liabilities Derivatives Fair Value (4,232)   (4,232)   (2,349)
Interest Rate Swap Agreement | Designated as Hedging | Interest Rate Risk          
Notional Amount 252,850   252,850   134,325
Liabilities Derivatives Fair Value (7,617)   (7,617)   (1,276)
Residential mortgage banking activities interest rate swaps          
Derivative gain (loss)          
Unrealized Gain (Loss) 1,392 1,597 593 885  
Interest rate lock commitments (IRLCs)          
Notional Amount 297,112   297,112   144,799
Asset Derivatives Fair Value 4,181   4,181   $ 1,775
Derivative gain (loss)          
Unrealized Gain (Loss) $ 510 $ (1,412) $ 2,405 $ (407)