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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current tax expense      
Current period $ 1,461 $ 5,878 $ 6,852
Adjustment for prior periods (126) (172) (686)
Current tax expense (income) and adjustments for current tax of prior periods 1,335 5,706 6,166
Deferred tax expense      
Origination and reversal of temporary differences 247 1,012 (955)
Investment tax credits and operating loss carryforward (1,166) (4,525) (657)
Effect of tax rate changes   (1,199)  
Deferred tax expense (income) (919) (4,712) (1,612)
Total income tax expense $ 416 $ 994 $ 4,554