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Loans and Allowance for Loan Losses (Loans Individually Evaluated for Impairment Disaggregated by Portfolio Class) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance $ 133,684   $ 169,341
Recorded investment with an allowance 122,774   132,004
Unpaid principal balance 270,818   327,722
Related allowance 16,501   29,295
Average recorded investment 278,903 $ 172,084  
Interest income recognized 388 221  
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 5,740   10,447
Recorded investment with an allowance 7,859   4,929
Unpaid principal balance 13,934   15,708
Related allowance 1,114   466
Average recorded investment 14,487 9,902  
Interest income recognized 43 22  
Total Commercial [Member] | Construction and Land Development [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 1,576   1,106
Recorded investment with an allowance 16   832
Unpaid principal balance 2,556   2,903
Related allowance 1   38
Average recorded investment 1,766 14,149  
Interest income recognized    
Residential Mortgages [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 2,158   2,877
Recorded investment with an allowance 1,078   1,470
Unpaid principal balance 3,761   4,865
Related allowance 94   91
Average recorded investment 3,792 889  
Interest income recognized 2 2  
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 1,243    
Recorded investment with an allowance 906   2,154
Unpaid principal balance 2,149   2,155
Related allowance 199   267
Average recorded investment 2,152 105  
Interest income recognized 2 1  
Total Commercial & Industrial [Member] | Total Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 122,967   154,911
Recorded investment with an allowance 112,915   122,619
Unpaid principal balance 248,418   302,091
Related allowance 15,093   28,433
Average recorded investment 256,706 147,039  
Interest income recognized 341 196  
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 120,166   150,650
Recorded investment with an allowance 111,822   120,612
Unpaid principal balance 244,153   295,445
Related allowance 15,017   28,187
Average recorded investment 251,625 141,326  
Interest income recognized 337 182  
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 2,801   4,261
Recorded investment with an allowance 1,093   2,007
Unpaid principal balance 4,265   6,646
Related allowance 76   $ 246
Average recorded investment 5,081 5,713  
Interest income recognized $ 4 $ 14