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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) | 3 Months Ended
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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

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