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Securities Available for Sale - Proceeds, Gains and Losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]      
Proceeds from investments sold $ 0 $ 128,791 $ 217,079
Gains from sales/calls of securities 0 402 1,032
Losses from sales of securities 0 (101) (84)
Net gain on sales or called securities 0 301 950
Call Option [Member]      
Debt Instrument [Line Items]      
Gains from sales/calls of securities $ 0 $ 0 $ 2