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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]    
Net income $ 83,510,000 $ 39,653,000
Other comprehensive (loss) income, net of tax:    
Change in fair value on available-for-sale securities, net of tax (33,541,000) (808,000)
Change in fair value of cash flow hedges, net of tax 1,579,000 (143,000)
Net gain on sale of investment securities reclassified from other comprehensive income into net income, net of tax (22,000) 0
Total other comprehensive (loss) income, net of tax (31,984,000) (951,000)
Total comprehensive income $ 51,526,000 $ 38,702,000