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Loans and Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Loans $ 7,392,615 $ 6,991,447  
Loans, percent 100.00% 100.00%  
Less: allowance for credit losses $ (72,086) $ (69,944)  
Loans, net 7,320,529 6,921,503  
Commercial [Member]      
Loans $ 1,475,201 $ 1,553,112  
Loans, percent 20.00% 22.00%  
Income Producing - Commercial Real Estate [Member]      
Loans $ 3,666,815 $ 3,256,900  
Loans, percent 50.00% 46.00%  
Owner Occupied - Commercial Real Estate - [Member]      
Loans $ 970,850 $ 887,814  
Loans, percent 13.00% 13.00%  
Real Estate Mortgage Residential [Member]      
Loans $ 105,191 $ 106,418  
Loans, percent 1.00%   2.00%
Construction - Commercial and Residential [Member]      
Loans $ 1,089,113 1,097,612  
Construction - Commercial and Residential [Member] | Commercial And Residential [Member]      
Loans $ 1,012,789 $ 1,039,815  
Loans, percent 14.00% 15.00%  
Construction - Commercial and Residential [Member] | C & I Owner Occupied [Member]      
Loans $ 76,324 $ 57,797  
Loans, percent 1.00% 1.00%  
Percent of loan portfolio 14.00%    
Home Equity [Member]      
Loans $ 83,447 $ 86,603  
Loans, percent 1.00% 1.00%  
Other Consumer [Member]      
Loans $ 1,998 $ 2,988