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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Accumulated Other Comprehensive Income        
Balance, beginning     $ 1,989 $ 17,744
Other comprehensive income before reclassification     16,302 (13,868)
Amounts reclassified from accumulated other comprehensive income     2,122 1,564
Net current period other comprehensive income $ 15,092 $ (12,587) 18,424 (12,304)
Balance, end 20,413 5,440 20,413 5,440
Available-For-Sale Securities        
Accumulated Other Comprehensive Income        
Balance, beginning     13,935 27,945
Other comprehensive income before reclassification     24,846 (12,574)
Amounts reclassified from accumulated other comprehensive income     35 28
Net current period other comprehensive income     24,881 (12,546)
Balance, end 38,816 15,399 38,816 15,399
Derivatives Used for Cash Flow Hedges        
Accumulated Other Comprehensive Income        
Balance, beginning     (11,946) (10,201)
Other comprehensive income before reclassification     (8,544) (1,294)
Amounts reclassified from accumulated other comprehensive income     2,087 1,536
Net current period other comprehensive income     (6,457) 242
Balance, end $ (18,403) $ (9,959) $ (18,403) $ (9,959)