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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]    
Net income $ 20,921 $ 12,391
Other comprehensive income (loss), net of tax:    
Unrealized gains (losses) on investment securities arising during the period, net of income tax expense (benefit) for three months of $(2,265) and $348, respectively (6,904) 567
Less: Reclassification adjustment for realized gains on sale of securities available for sale included in net income, net of income tax expense for three months of $2 and $0, respectively (7) 0
Total other comprehensive income (loss) (6,911) 567
Total comprehensive income $ 14,010 $ 12,958