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Consolidated Statements of Comprehensive Income (unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Statement of Comprehensive Income [Abstract]        
Net income $ 6,241 $ 5,925 $ 11,549 $ 10,884
Unrealized gains (losses) on securities:        
Unrealized (losses) gains arising during period (325) 1 (11) (29)
Less: reclassification adjustment for gains included in net income (27) (71) (27) (71)
Total unrealized (losses) gains on securities (352) (70) (38) (100)
Accretion of net unrealized losses transferred 762 1,027 1,747 1,762
Defined benefit pension plans:        
Amortization of prior service cost and loss included in net periodic benefit cost 243 213 485 426
Other comprehensive income 653 1,170 2,194 2,088
Comprehensive income $ 6,894 $ 7,095 $ 13,743 $ 12,972