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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Comprehensive Income [Abstract]    
Net income $ 21,173 $ 5,427
Other comprehensive income:    
Unrealized gain (loss) on debt securities (net of tax expense of $175 in 2019, and net of tax benefit of $85 in 2018, respectively) 644 (321)
Accretion of unrealized loss on debt securities reclassified to held-to-maturity (net of tax expense of $86 and $57 in 2019 and 2018, respectively) 125 216
Reclassification adjustment for gains included in net income (net of tax expense of $1 in 2018) 0 1
Total other comprehensive income (loss) 769 (104)
Total comprehensive income $ 21,942 $ 5,323