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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 $ 14,026 $ 15,182 $ 10,964
Unrealized gains (losses) on securities:      
Unrealized holdings gains (losses) arising during the period 7,705 (9,924) 59
Less: reclassification for net gains included in net income 2,802 1,224 1,481
Less: reclassification for other-than-temporary impairment loss included in net income 0 (136) 0
Transfer of investment securities from held-to-maturity to available-for-sale 0 2,647 0
Amortization of net unrealized gains transferred 0 (64) (78)
Other comprehensive income (loss), before tax 4,903 (8,429) (1,500)
Tax (expense) benefit related to items of other comprehensive income (2,062) 3,451 585
Total other comprehensive income (loss) 2,841 (4,978) (915)
Comprehensive income $ 16,867 $ 10,204 $ 10,049