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Loans and Allowance for Loan Losses (Loans Individually Evaluated for Impairment Disaggregated by Portfolio Class) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance $ 147,055 $ 169,341
Recorded investment with an allowance 170,142 132,004
Unpaid principal balance 341,713 327,722
Related allowance 18,566 29,295
Average recorded investment 286,536 236,013
Interest income recognized 3,015 1,330
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance 5,101 10,447
Recorded investment with an allowance 10,429 4,929
Unpaid principal balance 15,687 15,708
Related allowance 1,326 466
Average recorded investment 14,565 9,347
Interest income recognized 146 106
Total Commercial [Member] | Construction and Land Development [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance 100 1,106
Recorded investment with an allowance 263 832
Unpaid principal balance 363 2,903
Related allowance 11 38
Average recorded investment 1,018 6,366
Interest income recognized 2 1
Residential Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance 8,245 2,877
Recorded investment with an allowance 2,395 1,470
Unpaid principal balance 13,855 4,865
Related allowance 189 91
Average recorded investment 5,784 2,109
Interest income recognized 18 10
Consumer [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with an allowance 1,292 2,154
Unpaid principal balance 1,294 2,155
Related allowance 118 267
Average recorded investment 1,558 716
Interest income recognized 13 5
Total Commercial And Industrial [Member] | Total Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance 133,609 154,911
Recorded investment with an allowance 155,763 122,619
Unpaid principal balance 310,514 302,091
Related allowance 16,922 28,433
Average recorded investment 263,611 217,475
Interest income recognized 2,836 1,208
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance 116,682 150,650
Recorded investment with an allowance 151,199 120,612
Unpaid principal balance 285,685 295,445
Related allowance 16,129 28,187
Average recorded investment 255,710 211,324
Interest income recognized 2,774 1,164
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance 16,927 4,261
Recorded investment with an allowance 4,564 2,007
Unpaid principal balance 24,829 6,646
Related allowance 793 246
Average recorded investment 7,901 6,151
Interest income recognized $ 62 $ 44