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Goodwill and Other Intangible Assets (Summary of the Gross Carrying Amount and Accumulated Amortization of Intangible Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Amortizable intangible assets:    
Gross Carrying Amount $ 41,228 $ 37,790
Accumulated Amortization 20,116 13,353
Unamortizable intangible assets:    
Goodwill 234,368 233,070
Customer Lists [Member]    
Amortizable intangible assets:    
Gross Carrying Amount 6,013 6,013
Accumulated Amortization 1,637 1,090
Core Deposit Intangible [Member]    
Amortizable intangible assets:    
Gross Carrying Amount 28,440 28,280
Accumulated Amortization 16,469 11,475
SBA servicing asset [Member]    
Amortizable intangible assets:    
Gross Carrying Amount 5,472 2,194
Accumulated Amortization 1,053 207
Other Intangible Assets [Member]    
Amortizable intangible assets:    
Gross Carrying Amount 1,303 1,303
Accumulated Amortization $ 957 $ 581