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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, 2017
Dec. 31, 2016
Jun. 30, 2016
Amortizable intangible assets:      
Customer lists $ 2,369 $ 2,369 $ 2,369
Customer Lists Accumulated Amortization 866 746 624
Core deposit premiums 18,520 9,730 8,560
Core Deposit premiums accumulated amortization 9,404 8,143 7,660
Other 1,032 1,032 1,032
Other Accumulated Amortization 381 224 65
Gross Carrying Amount 21,921 13,131 11,961
Accumulated Amortization 10,651 9,113 8,349
SBA servicing asset 862 415
Unamortizable intangible assets:      
Goodwill $ 139,124 $ 75,042 $ 73,541