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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, 2017
Dec. 31, 2016
Sep. 30, 2016
Amortizable intangible assets:      
Customer lists $ 6,013 $ 2,369 $ 2,369
Customer Lists Accumulated Amortization 953 746 668
Core deposit premiums 18,520 9,730 9,730
Core Deposit premiums Accumulated Amortization 10,084 8,143 7,902
Other 1,303 1,032 1,032
Other Accumulated Amortization 471 224 166
Gross Carrying Amount 25,836 13,131 13,131
Accumulated Amortization 11,508 9,113 8,736
SBA servicing asset 1,306 415 208
Unamortizable intangible assets:      
Goodwill $ 144,667 $ 75,042 $ 75,392