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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, 2019
Dec. 31, 2018
Jun. 30, 2018
Amortizable intangible assets:      
Gross Carrying Amount $ 42,712 $ 41,228 $ 39,104
Accumulated Amortization 23,311 20,116 15,025
Unamortizable intangible assets:      
Goodwill 234,368 234,368 232,458
Customer lists      
Amortizable intangible assets:      
Gross Carrying Amount 6,013 6,013 6,013
Accumulated Amortization 1,911 1,637 1,185
Core deposit intangibles      
Amortizable intangible assets:      
Gross Carrying Amount 28,440 28,440 28,440
Accumulated Amortization 18,648 16,469 12,803
SBA servicing asset      
Amortizable intangible assets:      
Gross Carrying Amount 6,956 5,472 3,348
Accumulated Amortization 1,674 1,053 319
Other      
Amortizable intangible assets:      
Gross Carrying Amount 1,303 1,303 1,303
Accumulated Amortization $ 1,078 $ 957 $ 718