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Core Deposit, Customer Relationship and Other Intangibles (Summary of Core Deposit, Customer Relationship and Other Intangibles) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]    
Core deposit, customer relationship and other intangibles $ 54,174 $ 56,965
Core Deposits [Member]    
Finite Lived Intangible Assets [Line Items]    
Core deposit, customer relationship and other intangibles 41,111 43,185
Customer Relationships Intangible [Member]    
Finite Lived Intangible Assets [Line Items]    
Core deposit, customer relationship and other intangibles 12,567 13,213
Other Intangible Assets [Member]    
Finite Lived Intangible Assets [Line Items]    
Core deposit, customer relationship and other intangibles $ 496 $ 567