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Derivative Financial Instruments - Impact of Derivatives on Consolidated Statements of Income (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Trading                      
Total $ (3,635) $ 1,961 $ 16,736 $ 2,763 $ 6,238 $ (4,949) $ (5,268) $ 3,892      
Interest Rate Swaps                      
Trading                      
Total                 $ 12,789 $ (14,340) $ (10,554)
Interest Rate Swaps | Designated as Hedging Instrument | Fair Value                      
Fair Value Hedges                      
Interest recognized on derivatives                 (8,806) (11,642) 8,286
Hedged items recorded in interest expense                 (77,350) (7,966) 16,155
Derivatives recorded in interest expense                 77,177 8,123 (20,115)
Trading                      
Total                 (8,979) (11,485) 4,326
Interest Rate Swaps | Designated as Hedging Instrument | Cash Flow                      
Cash Flow Hedges                      
Amount of gain (loss) reclassified from accumulated other comprehensive income into interest expense                 2,299 (1,455) (11,187)
Trading                      
Total                 2,299 (1,455) (11,187)
Interest Rate Swaps | Trading                      
Trading                      
Change in fair value of future interest payments recorded in earnings                 19,469 (1,400) (3,693)
Total                 $ 19,469 $ (1,400) $ (3,693)