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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Net income $ 57,709 $ 115,416 $ 62,072
Unrealized gain (loss) on securities available-for-sale:      
Unrealized gain (loss) arising during the period 10,068 11,140 (1,614)
Unrealized gain arising from the reclassification of securities held-to-maturity to securities available-for-sale 12,845 0 0
Reclassification adjustment for gain included in net income (8,644) (17,187) (1,890)
Total change in unrealized gain (loss) on securities available-for-sale 14,269 (6,047) (3,504)
Unrealized gain (loss) on cash flow hedge:      
Unrealized loss arising during the period 0 0 (396)
Reclassification adjustment for loss included in net income 0 0 532
Total change in unrealized gain on cash flow hedge 0 0 136
Total other comprehensive income (loss) 14,269 (6,047) (3,368)
Comprehensive income $ 71,978 $ 109,369 $ 58,704