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Loans Receivable and Allowance for Loan Losses (Summary of Loans Receivable) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Qualifying loans pledged as FHLB collateral $ 398,000          
Bank loans receivable, Gross 2,097,704   $ 1,998,534      
Bank loans receivable, Allowance for loan losses 26,742 $ 25,871 24,998 $ 24,540 $ 24,271 $ 23,110
Bank loans receivable, Net 2,070,962   1,973,536      
Commercial and industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Bank loans receivable, Gross 607,084   525,127      
Bank loans receivable, Allowance for loan losses 11,716 12,038 11,714 9,984 7,100 8,178
Commercial tax-exempt [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Bank loans receivable, Gross 58,999   71,151      
Bank loans receivable, Allowance for loan losses 46 45 55 67 67 72
Owner occupied real estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Bank loans receivable, Gross 315,555   332,070      
Bank loans receivable, Allowance for loan losses 3,013 1,934 1,931 1,972 2,233 2,180
Commercial construction and land development [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Bank loans receivable, Gross 140,135   138,064      
Bank loans receivable, Allowance for loan losses 4,470 4,476 4,242 4,022 6,696 5,559
Commercial real estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Bank loans receivable, Gross 639,135   594,276      
Bank loans receivable, Allowance for loan losses 5,241 5,178 4,707 4,747 4,840 4,161
Residential [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Bank loans receivable, Gross 119,083   110,951      
Bank loans receivable, Allowance for loan losses 818 855 796 1,604 1,061 960
Consumer [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Bank loans receivable, Gross 217,713   226,895      
Bank loans receivable, Allowance for loan losses $ 852 $ 959 $ 931 $ 1,366 $ 1,333 $ 1,303