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Core Deposit, Customer Relationship and Other Intangibles (Summary of Core Deposit, Customer Relationship and Other Intangibles) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]    
Core deposit, customer relationship and other intangibles $ 56,965 $ 3,369
Core Deposits [Member]    
Finite Lived Intangible Assets [Line Items]    
Core deposit, customer relationship and other intangibles 43,185 2,481
Customer Relationships Intangible [Member]    
Finite Lived Intangible Assets [Line Items]    
Core deposit, customer relationship and other intangibles 13,213 888
Other Intangible Assets [Member]    
Finite Lived Intangible Assets [Line Items]    
Core deposit, customer relationship and other intangibles $ 567 $ 0