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Securities - Pledged as Collateral (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Available for sale securities    
Amortized Cost $ 208,925 $ 216,650
Fair Value 209,007 214,910 [1]
Securities Pledged as Collateral    
Available for sale securities    
Amortized Cost 103,410 110,810
Fair Value $ 103,330 $ 109,830
[1] Derived from audited consolidated financial statements.