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Loans (Summary of Loans) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial $ 1,654,547 $ 1,535,488
Residential real estate 1,013,555 985,415
Consumer 345,025 338,373
Total loans $ 3,013,127 $ 2,859,276
Percent of total loans 100.00% 100.00%
Commercial Mortgages [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial $ 931,953 $ 843,978
Total loans $ 931,953 $ 843,978
Percent of total loans 31.00% 30.00%
Commercial Construction & Development [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial $ 122,297 $ 79,592
Total loans $ 122,297 $ 79,592
Percent of total loans 4.00% 3.00%
Commercial & Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial $ 600,297 $ 611,918
Total loans $ 600,297 $ 611,918
Percent of total loans 20.00% 21.00%
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial $ 1,654,547 $ 1,535,488
Percent of total loans 55.00% 54.00%
Residential Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Residential real estate $ 984,437 $ 948,731
Total loans $ 984,437 $ 948,731
Percent of total loans 33.00% 33.00%
Homeowner Construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Residential real estate $ 29,118 $ 36,684
Total loans $ 29,118 $ 36,684
Percent of total loans 1.00% 1.00%
Residential Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Residential real estate $ 1,013,555 $ 985,415
Percent of total loans 34.00% 34.00%
Home Equity Lines [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Consumer $ 255,565 $ 242,480
Total loans $ 255,565 $ 242,480
Percent of total loans 8.00% 8.00%
Home Equity Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Consumer $ 46,649 $ 46,967
Total loans $ 46,649 $ 46,967
Percent of total loans 2.00% 2.00%
Other Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Consumer $ 42,811 $ 48,926
Total loans $ 42,811 $ 48,926
Percent of total loans 1.00% 2.00%
Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Consumer $ 345,025 $ 338,373
Percent of total loans 11.00% 12.00%