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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Net income $ 10,451 $ 9,066 $ 20,082 $ 17,934
Available-for-sale debt securities:        
Change in net unrealized (losses) gains on debt securities without other-than-temporary impairment 332 (296) 1,550 (2,443)
Reclassification adjustment for net losses recognized in net income 43 43
Net unrealized (losses) gains on available-for-sale debt securities 375 (296) 1,593 (2,443)
Employee benefit plans:        
Net actuarial (loss) 1 93 (406) 92
Reclassification adjustment for amortization of prior service cost and net actuarial loss recognized in net income 70 71 139 142
Net unrealized gains (losses) on employee benefit plans 71 164 (267) 234
Other comprehensive (loss) income, before tax 446 (132) 1,326 (2,209)
Income tax (benefit) expense 94 (28) 278 (464)
Other comprehensive income, net 352 (104) 1,048 (1,745)
Total comprehensive income $ 10,803 $ 8,962 $ 21,130 $ 16,189