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Derivative Instruments and Hedging Activities (Effect of Cash Flow Hedges on Consolidated Statements of Income) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Derivative [Line Items]          
Total amounts presented in the consolidated statements of income in interest income on loans $ 8,509 $ 0 $ 13,595 $ 0  
Investment securities available for sale, at fair value 7,566,525   7,566,525   $ 6,778,670
Fair Value, Measurements, Recurring Basis | U.S. Government agency securities          
Derivative [Line Items]          
Investment securities available for sale, at fair value 156,614   156,614   36,541
Level 1          
Derivative [Line Items]          
Investment securities available for sale, at fair value 20,254   20,254   19,855
Level 1 | Fair Value, Measurements, Recurring Basis | U.S. Government agency securities          
Derivative [Line Items]          
Investment securities available for sale, at fair value 0   0   $ 0
Interest rate contracts | Cash Flow Hedges          
Derivative [Line Items]          
Realized gains (losses) reclassified from AOCI, pre-tax, to interest income on loans 1,031 0 1,421    
Pre-tax income recognized on cash flow hedges $ 1,031 $ 0 $ 1,421 $ 0