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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Statement of Comprehensive Income [Abstract]          
Unrealized holding gain (loss) on securities arising during the period, income tax expense (benefit) $ 4,400 $ 7,700 $ (1,600) $ 16,000 $ (6,800)
Reclassification adjustment for net (gains) losses on sale of securities included in net income, income tax expense (benefit) $ 1,200 $ 61 $ 229 $ 1,400 $ 320