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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, 2018
Dec. 31, 2017
Mar. 31, 2017
Amortizable intangible assets:      
Gross Carrying Amount $ 39,104 $ 37,790 $ 22,500
Accumulated Amortization 15,025 13,353 9,720
Unamortizable intangible assets:      
Goodwill 231,681 233,070 142,872
Customer Lists [Member]      
Amortizable intangible assets:      
Gross Carrying Amount 6,013 6,013 2,369
Accumulated Amortization 1,185 1,090 806
Core Deposit Intangible [Member]      
Amortizable intangible assets:      
Gross Carrying Amount 28,440 28,280 18,520
Accumulated Amortization 12,803 11,475 8,580
SBA servicing asset [Member]      
Amortizable intangible assets:      
Gross Carrying Amount 3,348 2,194 579
Accumulated Amortization 319 207 31
Other Intangible Assets [Member]      
Amortizable intangible assets:      
Gross Carrying Amount 1,303 1,303 1,032
Accumulated Amortization $ 718 $ 581 $ 303