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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, 2019
Dec. 31, 2018
Mar. 31, 2018
Amortizable intangible assets:      
Gross Carrying Amount $ 41,828 $ 41,228 $ 39,104
Accumulated Amortization 21,747 20,116 15,025
Unamortizable intangible assets:      
Goodwill 234,368 234,368 231,681
Customer Lists [Member]      
Amortizable intangible assets:      
Gross Carrying Amount 6,013 6,013 6,013
Accumulated Amortization 1,774 1,637 1,185
Core Deposit Intangible [Member]      
Amortizable intangible assets:      
Gross Carrying Amount 28,440 28,440 28,440
Accumulated Amortization 17,585 16,469 12,803
SBA servicing asset [Member]      
Amortizable intangible assets:      
Gross Carrying Amount 6,072 5,472 3,348
Accumulated Amortization 1,352 1,053 319
Other Intangible Assets [Member]      
Amortizable intangible assets:      
Gross Carrying Amount 1,303 1,303 1,303
Accumulated Amortization $ 1,036 $ 957 $ 718