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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Net income $ 7,872 $ 9,631
Other comprehensive income, before tax    
Change in net unrealized gains on debt securities without other-than-temporary impairment 1,199 1,218
Reclassification adjustment for net gains recognized in net income (385)
Net unrealized gains on available-for-sale debt securities 814 1,218
Employee benefit plans:    
Net actuarial loss (446) (407)
Reclassification adjustment for amortization of prior service cost and net actuarial loss recognized in net income 97 69
Net unrealized losses on employee benefit plans (349) (338)
Other comprehensive income, before tax 465 880
Income tax expense 98 184
Other comprehensive income (loss), net 367 696
Total comprehensive income $ 8,239 $ 10,327