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Loans and Allowance for Credit Losses (Details 2) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Recorded investment in loans:    
Loans individually evaluated for impairment $ 37,281 $ 30,191
Loans collectively evaluated for impairment 6,614,423 6,381,337
Net loans 6,651,704 6,411,528
Commercial [Member]    
Recorded investment in loans:    
Loans individually evaluated for impairment 13,909 8,726
Loans collectively evaluated for impairment 1,453,180 1,367,213
Net loans 1,467,089 1,375,939
Income Producing - Commercial Real Estate [Member]    
Recorded investment in loans:    
Loans individually evaluated for impairment 9,470 10,192
Loans collectively evaluated for impairment 2,990,916 3,036,902
Net loans 3,000,386 3,047,094
Owner Occupied - Commercial Real Estate - [Member]    
Recorded investment in loans:    
Loans individually evaluated for impairment 7,441 5,501
Loans collectively evaluated for impairment 845,256 749,943
Net loans 852,697 755,444
Real Estate Mortgage - Residential [Member]    
Recorded investment in loans:    
Loans individually evaluated for impairment 1,686 478
Loans collectively evaluated for impairment 101,729 103,879
Net loans 103,415 104,357
Construction - Commercial And Residential [Member]    
Recorded investment in loans:    
Loans individually evaluated for impairment 4,190 4,709
Loans collectively evaluated for impairment 1,131,577 1,027,123
Net loans 1,135,767 1,031,832
Home Equity [Member]    
Recorded investment in loans:    
Loans individually evaluated for impairment 494 494
Loans collectively evaluated for impairment 89,045 92,770
Net loans 89,539 93,264
Other Consumer [Member]    
Recorded investment in loans:    
Loans individually evaluated for impairment 91 91
Loans collectively evaluated for impairment 2,720 3,507
Net loans $ 2,811 $ 3,598