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Loans (Loans Individually Evaluated for Impairment Disaggregated by Portfolio Class) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance $ 169,341 $ 55,034
Recorded investment with an allowance 132,004 58,392
Unpaid principal balance 327,722 118,623
Related allowance 29,295 20,988
Average recorded investment 236,013 74,184
Interest income recognized 1,330 242
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance 10,447 3,038
Recorded investment with an allowance 4,929 8,085
Unpaid principal balance 15,708 11,363
Related allowance 466 1,382
Average recorded investment 9,347 11,396
Interest income recognized 106 85
Total Commercial [Member] | Construction and Land Development [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance 1,106 12,461
Recorded investment with an allowance 832 1,765
Unpaid principal balance 2,903 14,784
Related allowance 38 392
Average recorded investment 6,366 5,508
Interest income recognized 1 66
Residential Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance 2,877  
Recorded investment with an allowance 1,470 895
Unpaid principal balance 4,865 1,405
Related allowance 91 127
Average recorded investment 2,109 1,618
Interest income recognized 10 22
Consumer [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with an allowance 2,154 152
Unpaid principal balance 2,155 152
Related allowance 267 33
Average recorded investment 716 119
Interest income recognized 5 4
Total Commercial & Industrial [Member] | Total Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance 154,911 39,535
Recorded investment with an allowance 122,619 47,495
Unpaid principal balance 302,091 90,919
Related allowance 28,433 19,054
Average recorded investment 217,475 55,543
Interest income recognized 1,208 65
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance 150,650 34,788
Recorded investment with an allowance 120,612 46,834
Unpaid principal balance 295,445 84,988
Related allowance 28,187 19,031
Average recorded investment 211,324 41,274
Interest income recognized 1,164 11
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance 4,261 4,747
Recorded investment with an allowance 2,007 661
Unpaid principal balance 6,646 5,931
Related allowance 246 23
Average recorded investment 6,151 14,269
Interest income recognized $ 44 $ 54