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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
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Amortizable intangible assets:      
Gross Carrying Amount $ 40,705 $ 37,790 $ 27,254
Accumulated Amortization 18,426 13,353 11,620
Unamortizable intangible assets:      
Goodwill 232,458 233,070 144,667
Customer Lists [Member]      
Amortizable intangible assets:      
Gross Carrying Amount 6,013 6,013 6,013
Accumulated Amortization 1,459 1,090 953
Core Deposit Intangible [Member]      
Amortizable intangible assets:      
Gross Carrying Amount 28,440 28,280 18,520
Accumulated Amortization 15,300 11,475 10,084
SBA servicing asset [Member]      
Amortizable intangible assets:      
Gross Carrying Amount 4,949 2,194 1,418
Accumulated Amortization 761 207 112
Other Intangible Assets [Member]      
Amortizable intangible assets:      
Gross Carrying Amount 1,303 1,303 1,303
Accumulated Amortization $ 906 $ 581 $ 471