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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Trading                      
Total $ (940) $ 1,661 $ (3,609) $ (5,378) $ (4,114) $ 1,368 $ 2,142 $ (354)      
Interest Rate Swaps                      
Trading                      
Total                 $ (11,167) $ 9,188 $ 13,765
Interest Rate Swaps | Designated as Hedging Instrument | Fair Value                      
Fair Value Hedges                      
Hedge ineffectiveness (losses) gains recorded in earnings                 (4,557) (1,035) 2,695
Realized gains recorded in interest expense                 8,286 27,810 29,940
Trading                      
Total                 3,729 26,775 32,635
Interest Rate Swaps | Designated as Hedging Instrument | Cash Flow                      
Cash Flow Hedges                      
Hedge ineffectiveness losses recorded in earnings                 53 (1,579) (1,427)
Realized losses recorded in interest expense                 (11,187) (17,665) (21,475)
Trading                      
Total                 (11,134) (19,244) (22,902)
Interest Rate Swaps | Trading                      
Trading                      
Interest reclassification                 (69) 2,170 3,451
Realized gains (losses) recorded in earnings                 (3,693) (513) 581
Total                 $ (3,762) $ 1,657 $ 4,032