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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, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance $ 161,227 $ 147,055
Recorded investment with an allowance 107,528 170,142
Unpaid principal balance 308,401 341,713
Related allowance 5,114 18,566
Average recorded investment 327,183 286,536
Interest income recognized 8,390 3,015
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance 1,138 5,101
Recorded investment with an allowance 1,563 10,429
Unpaid principal balance 3,428 15,687
Related allowance 210 1,326
Average recorded investment 9,155 14,565
Interest income recognized 71 146
Total Commercial [Member] | Construction and Land Development [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance 100 100
Recorded investment with an allowance 21 263
Unpaid principal balance 121 363
Related allowance 1 11
Average recorded investment 145 1,018
Interest income recognized   2
Residential Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance 2,058 8,245
Recorded investment with an allowance 1,818 2,395
Unpaid principal balance 4,421 13,855
Related allowance 444 189
Average recorded investment 5,598 5,784
Interest income recognized 18 18
Consumer [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance 279  
Recorded investment with an allowance 728 1,292
Unpaid principal balance 1,253 1,294
Related allowance 216 118
Average recorded investment 814 1,558
Interest income recognized 39 13
Total Commercial And Industrial [Member] | Total Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance 157,652 133,609
Recorded investment with an allowance 103,398 155,763
Unpaid principal balance 299,178 310,514
Related allowance 4,243 16,922
Average recorded investment 311,471 263,611
Interest income recognized 8,262 2,836
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance 144,625 116,682
Recorded investment with an allowance 94,759 151,199
Unpaid principal balance 273,290 285,685
Related allowance 3,636 16,129
Average recorded investment 286,146 255,710
Interest income recognized 7,919 2,774
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance 13,027 16,927
Recorded investment with an allowance 8,639 4,564
Unpaid principal balance 25,888 24,829
Related allowance 607 793
Average recorded investment 25,325 7,901
Interest income recognized $ 343 $ 62