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Derivative Financial Instruments (Narrative Disclosures) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Derivatives          
Fair value of interest rate swaps $ 16,409,000   $ 16,409,000   $ 4,637,000
Interest rate swap contracts not designated as hedging instruments - liabilities, gross 16,409,000   16,409,000   $ 4,637,000
Interest Rate Swaps, Default 0   0    
Derivative asset, fair value, amount offset against collateral 0   0    
Pretax unrealized gain on interest rates swaps designated as cash flow hedges (1,514,000) $ 358,000 (2,464,000) $ 1,030,000  
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 16,400,000   16,400,000    
Interest rate swap contracts not designated as hedging instruments - liabilities, gross 183,000   $ 183,000    
To commercial borrowers, corporation receives fixed rates and pays floating rates | Minimum          
Derivatives          
Derivative, maturity date     Mar. 31, 2021    
To commercial borrowers, corporation receives fixed rates and pays floating rates | Maximum          
Derivatives          
Derivative, maturity date     Jul. 15, 2034    
To dealer countparties, corporation pays fixed rates and receives floating rates          
Derivatives          
Fair value of interest rate swaps 183,000   $ 183,000    
Interest rate swap contracts not designated as hedging instruments - liabilities, gross 16,400,000   16,400,000    
Interest rate derivative instruments not designated as hedging instruments at fair value, net 16,200,000   $ 16,200,000    
To dealer countparties, corporation pays fixed rates and receives floating rates | Minimum          
Derivatives          
Derivative, maturity date     Mar. 31, 2021    
To dealer countparties, corporation pays fixed rates and receives floating rates | Maximum          
Derivatives          
Derivative, maturity date     Jul. 15, 2034    
Interest rate swaps | Minimum          
Derivatives          
Derivative, maturity date     Dec. 31, 2021    
Interest rate swaps | Maximum          
Derivatives          
Derivative, maturity date     Dec. 31, 2027    
Not Designated as Hedging Instrument | To commercial borrowers, corporation receives fixed rates and pays floating rates          
Derivatives          
Notional value of interest rate swaps with various commercial borrowers 237,700,000   $ 237,700,000    
Not Designated as Hedging Instrument | To dealer countparties, corporation pays fixed rates and receives floating rates          
Derivatives          
Notional value of interest rate swaps with various commercial borrowers 237,700,000   237,700,000    
Designated as Hedging Instrument | Interest rate swaps          
Derivatives          
Notional value of interest rate swaps with various commercial borrowers $ 54,000,000   $ 54,000,000