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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]        
Goodwill $ 117,345 $ 117,345    
Amortization of intangible assets   5,543 $ 2,503 $ 2,609
Finite-lived intangible assets useful life     10 years  
Finite-Lived Intangible Assets [Line Items]        
Core deposit intangible, net, end of year   $ 26,076    
Core Deposits [Member]        
Goodwill and Intangible Assets Disclosure [Abstract]        
Finite-lived intangible assets useful life 10 years 10 years    
Finite-Lived Intangible Assets [Line Items]        
Acquired Finite-lived Intangible Asset, Residual Value   $ 23,066 $ 0  
Amortization   (5,543) (2,503)  
Core deposit intangible, net, end of year   $ 26,076 $ 8,553 $ 11,056