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Long-Term Debt (Tables)
12 Months Ended
Dec. 31, 2018
Long-term debt:  
Schedule of Long-term Debt Instruments [Table Text Block]
20182017
WeightedWeighted
(Dollars in thousands)AmountAvg. RateAmountAvg. Rate
Subordinated debentures, due 2033$%$3,2174.63%
Total long-term debt$%$3,2174.63%