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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
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Amortizable intangible assets:      
Customer lists $ 2,369 $ 2,369 $ 1,269
Customer Lists Accumulated Amortization 806 746 572
Core deposit premiums 18,520 9,730 8,560
Core Deposit premiums accumulated amortization 8,580 8,143 7,506
Other 1,032 1,032 92
Other Accumulated Amortization 303 224 10
Gross Carrying Amount 21,921 13,131 9,921
Accumulated Amortization 9,689 9,113 8,088
SBA servicing asset 579 415
Unamortizable intangible assets:      
Goodwill $ 142,872 $ 75,042 $ 67,528