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Derivative Financial Instruments (Narrative Disclosures) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Derivatives          
Interest Rate Swaps, Default $ 0   $ 0    
Interest rate swap contracts not designated as hedging instruments - liabilities, gross 58,808,000   58,808,000   $ 18,346,000
Fair value of interest rate swaps 58,808,000   58,808,000   $ 18,346,000
Derivative asset, fair value, amount offset against collateral 0   0    
Pretax unrealized gain on interest rates swaps designated as cash flow hedges (418,000) $ (1,514,000) (4,043,000) $ (2,464,000)  
Gain recognized in income on ineffective portion of hedges       $ 0  
To commercial borrowers, corporation receives fixed rates and pays floating rates          
Derivatives          
Fair value of interest rate swaps 58,800,000   58,800,000    
To dealer countparties, corporation pays fixed rates and receives floating rates          
Derivatives          
Interest rate swap contracts not designated as hedging instruments - liabilities, gross 58,800,000   58,800,000    
Fair value of interest rate swaps 0   0    
Interest rate derivative instruments not designated as hedging instruments at fair value, net 58,800,000   58,800,000    
Not Designated as Hedging Instrument | To commercial borrowers, corporation receives fixed rates and pays floating rates          
Derivatives          
Derivative, Notional Amount 467,100,000   467,100,000    
Not Designated as Hedging Instrument | To dealer countparties, corporation pays fixed rates and receives floating rates          
Derivatives          
Derivative, Notional Amount 467,100,000   467,100,000    
Designated as Hedging Instrument | Interest rate swaps          
Derivatives          
Derivative, Notional Amount $ 114,000,000.0   $ 114,000,000.0