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Securities Available for Sale - Proceeds, Gains and Losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Proceeds from investments sold $ 128,791 $ 217,079 $ 22,510
Gains from sales/calls of securities 402 1,032 437
Losses from sales of securities (101) (84) (13)
Net gain on sales or called securities 301 950 424
Call Option [Member]      
Debt Instrument [Line Items]      
Gains from sales/calls of securities $ 0 $ 2 $ 0