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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Net income $ 119,600 $ 140,406 $ 131,252
Other comprehensive (loss) income:      
Net unrealized (loss) gain on available-for-sale securities (7,298) 22,864 (2,316)
Reclassification of unrealized gain on available-for-sale securities to net income (25,561) (10,536) (21,167)
Net unrealized gain on interest rate agreements 8,908 1,022 3,271
Reclassification of unrealized loss on interest rate agreements to net income 0 45 72
Total other comprehensive (loss) income (23,951) 13,395 (20,140)
Total Comprehensive Income $ 95,649 $ 153,801 $ 111,112