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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, 2018
Dec. 31, 2017
Jun. 30, 2017
Amortizable intangible assets:      
Gross Carrying Amount $ 39,922 $ 37,790 $ 22,849
Accumulated Amortization 16,770 13,353 10,717
Unamortizable intangible assets:      
Goodwill 232,458 233,070 139,124
Customer Lists [Member]      
Amortizable intangible assets:      
Gross Carrying Amount 6,013 6,013 2,369
Accumulated Amortization 1,322 1,090 866
Core Deposit Intangible [Member]      
Amortizable intangible assets:      
Gross Carrying Amount 28,440 28,280 18,520
Accumulated Amortization 14,078 11,475 9,404
SBA servicing asset [Member]      
Amortizable intangible assets:      
Gross Carrying Amount 4,166 2,194 928
Accumulated Amortization 558 207 66
Other Intangible Assets [Member]      
Amortizable intangible assets:      
Gross Carrying Amount 1,303 1,303 1,032
Accumulated Amortization $ 812 $ 581 $ 381