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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
Jun. 30, 2020
Dec. 31, 2019
Amortizable intangible assets:    
Gross Carrying Amount $ 44,236 $ 43,532
Accumulated Amortization 29,764 26,315
Unamortizable intangible assets:    
Goodwill 234,368 234,368
Customer lists    
Amortizable intangible assets:    
Gross Carrying Amount 6,013 6,013
Accumulated Amortization 2,445 2,185
Core deposit intangibles    
Amortizable intangible assets:    
Gross Carrying Amount 28,440 28,440
Accumulated Amortization 22,337 20,610
SBA servicing asset    
Amortizable intangible assets:    
Gross Carrying Amount 8,480 7,776
Accumulated Amortization 3,809 2,393
Other    
Amortizable intangible assets:    
Gross Carrying Amount 1,303 1,303
Accumulated Amortization $ 1,173 $ 1,127