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DERIVATIVES - Non-Designated Hedges (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Derivatives          
Notional amounts $ 1,000,000   $ 1,000,000   $ 823,900
Loan Swap Fees 1,320 $ 528 2,551 $ 1,643  
Loan customers          
Derivatives          
Notional amounts 512,500   512,500   411,900
Bank counterparties          
Derivatives          
Notional amounts 512,500   512,500   411,900
Interest rate swaps | Non-Designated Hedges          
Derivatives          
Notional amounts 1,025,029   $ 1,025,029   $ 823,894
Weighted average pay rates (as a percent)     2.94%   3.75%
Weighted average receive rates (as a percent)     2.94%   3.75%
Weighted average maturity     10 years 3 months 7 days   10 years 9 months 7 days
Fair value of combined interest rate swaps $ 0   $ 0   $ 0