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Securities Available for Sale - Proceeds, Gains and Losses (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Proceeds from investments sold $ 115,628,000 $ 0 $ 128,791,000
Gains from sales/calls of securities 750,000 0 402,000
Losses from sales of securities (469,000) 0 (101,000)
Net gain on sales or called securities 282,000 0 301,000
Tax provision recorded on net gains on sales and calls of securities available for sale 69,000 0 142,000
Call Option [Member]      
Debt Instrument [Line Items]      
Gains from sales/calls of securities $ 1,000 $ 0 $ 0