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Derivative Financial Instruments - Interest Swap Derivatives (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]              
Notional Value   $ 416,200     $ 416,200   $ 840,646
Fair Value   (32,977)     (32,977)   (37,939)
Interest expense   16,518 $ 22,450   57,540 $ 61,944  
Payments for swap termination payments $ 46,100            
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)         3 years 4 months 24 days   5 years 3 months 18 days
Fair Value   $ (6,610)     $ (6,610)   $ (24,357)
Weighted-Average Rate   2.54%     2.54%   2.80%
Cash collateral received             $ 33,700
Cash collateral pledged             42,300
Loans | Derivatives designated as hedging instruments              
Derivative Instruments and Hedging Activities Disclosures [Line Items]              
Fair value hedging adjustment       $ 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)         13 years 4 months 24 days   5 years 6 months
Fair Value             $ (21,551)
Weighted-Average Rate             2.86%
Fair value hedging adjustment         $ 44,300    
Securities available-for-sale | Derivatives designated as hedging instruments              
Derivative Instruments and Hedging Activities Disclosures [Line Items]              
Fair value hedging adjustment       $ 2,802 6,595    
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)         3 years 4 months 24 days   4 years 1 month 6 days
Fair Value   $ (6,610)     $ (6,610)   $ (2,806)
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)         6 years 3 months 18 days   7 years 1 month 6 days
Fair Value   $ (17,177)     $ (17,177)   $ (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)         3 years 2 months 12 days   4 years
Fair Value   $ (8,705)     $ (8,705)   $ (5,040)
Derivative, variable interest rate   2.88%     2.88%   2.88%