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Derivative Financial Instruments - Interest Swap Derivatives (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Notional Value $ 309,910     $ 309,910   $ 840,646
Fair Value (34,511)     (34,511)   (37,939)
Interest expense 19,796   $ 20,739 41,022 $ 39,494  
Interest rate swaps | Derivatives designated as hedging instruments            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Notional Value $ 88,200     $ 88,200   $ 515,646
Weighted Average Remaining Maturity (years)   5 years 3 months 18 days   3 years 7 months 6 days    
Fair Value   $ (24,357)   $ (7,097)    
Weighted-Average Rate 2.54%     2.54%   2.80%
Cash collateral received           $ 34,600
Cash collateral pledged           42,300
Loans | Derivatives designated as hedging instruments            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Fair Value   $ 21,440   $ 0    
Loans | Interest rate swaps | Derivatives designated as hedging instruments            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Notional Value           $ 427,446
Weighted Average Remaining Maturity (years)   5 years 6 months        
Fair Value   $ (21,551)        
Weighted-Average Rate           2.86%
Securities available-for-sale | Derivatives designated as hedging instruments            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Fair Value   $ 2,802   7,095    
Securities available-for-sale | Interest rate swaps | Derivatives designated as hedging instruments            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Notional Value $ 88,200     $ 88,200   $ 88,200
Weighted Average Remaining Maturity (years)   4 years 1 month 6 days   3 years 7 months 6 days    
Fair Value   $ (2,806)   $ (7,097)    
Weighted-Average Rate 2.54%     2.54%   2.54%
3-month LIBOR | Interest rate swaps | Derivatives designated as hedging instruments            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Notional Value $ 110,000     $ 110,000   $ 110,000
Weighted Average Remaining Maturity (years)   7 years 1 month 6 days   6 years 7 months 6 days    
Fair Value $ (17,993)     $ (17,993)   $ (8,390)
Derivative, variable interest rate 2.88%     2.88%   2.88%
1-month LIBOR | Interest rate swaps | Derivatives designated as hedging instruments            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Notional Value $ 100,000     $ 100,000   $ 100,000
Weighted Average Remaining Maturity (years)   4 years   3 years 6 months    
Fair Value $ (9,404)     $ (9,404)   $ (5,040)
Derivative, variable interest rate 2.88%     2.88%   2.88%