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Goodwill and Other Intangible Assets - Acquired intangible assets subject to amortization (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]    
Total $ 2,625  
Core deposit    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 3,590 $ 3,590
Accumulated Amortization (965) (784)
Total $ 2,625 $ 2,806