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Loans - Narrative Section (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Debt Instrument [Line Items]          
Fees and cost related to loans $ 4,900   $ 4,900   $ 6,300
Carrying amount of loan investments 3,087,945 $ 2,738,504 3,087,945 $ 2,738,504 2,860,921
Commercial Loan [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 1,775,454   1,775,454   1,560,430
Non Accrual [Member]          
Debt Instrument [Line Items]          
Recorded investment, non-accrual status 32,500   32,500    
Increase (decrease) in non-accrual loans     $ 1,700    
Percentage increase (decrease) in past due loans     5.70%    
Non Accrual [Member] | Owner-Occupied [Member]          
Debt Instrument [Line Items]          
Decrease related to loans resolved and/or charged-off     $ 2,200    
Non Accrual [Member] | Other          
Debt Instrument [Line Items]          
Increase (decrease) in non-accrual loans     (500)    
Non ASC 310-30 [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 2,953,518   2,953,518   2,715,069
Allowance for Loan and Lease Losses, Write-offs 121 3,686 331 4,345  
Non ASC 310-30 [Member] | Commercial Loan [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 1,739,476   1,739,476   1,521,150
ASC 310-30 [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 134,427   134,427   145,852
Allowance for Loan and Lease Losses, Write-offs   $ 41   $ 41  
ASC 310-30 [Member] | Commercial Loan [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 35,978   35,978   39,280
Total Loans [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 3,087,945   3,087,945   2,860,921
Total Loans [Member] | Non ASC 310-30 [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 2,953,518   2,953,518   2,715,069
Recorded investment, non-accrual status 32,455   32,455   30,717
Total past due loans 18,360   18,360   19,435
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial and Industrial [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 1,275,855   1,275,855   1,074,696
Recorded investment, non-accrual status 7,780   7,780   8,688
Total past due loans 5,021   5,021   8,221
Total Loans [Member] | Non ASC 310-30 [Member] | Energy Loans [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 98,293   98,293   90,273
Recorded investment, non-accrual status 12,050   12,050   12,645
Total past due loans 6,613   6,613   6,550
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 1,739,476   1,739,476   1,521,150
Recorded investment, non-accrual status 26,415   26,415   25,294
Total past due loans 13,523   13,523   16,127
Total Loans [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 233,930   233,930   221,544
Recorded investment, non-accrual status 4,377   4,377   2,056
Total past due loans 942   942   855
Total Loans [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 293,807   293,807   309,068
Recorded investment, non-accrual status 35   35   66
Total past due loans 135   135   28
Total Loans [Member] | ASC 310-30 [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 134,427   134,427   145,852
Total Loans [Member] | ASC 310-30 [Member] | Commercial Loan [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 35,978   35,978   39,280
Total Loans [Member] | Substandard [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 77,529   77,529   116,558
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 40,712   40,712   56,924
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Commercial and Industrial [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 15,472   15,472   25,636
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Energy Loans [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 5,998   5,998   7,811
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 30,340   30,340   45,490
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 6,196   6,196   10,137
Increase (decrease) in loan investments     1,400    
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 1,234   1,234   2,251
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 36,817   36,817   59,634
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Commercial Loan [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 7,074   7,074   11,234
Total Loans [Member] | Special Mention [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 49,530   49,530   38,590
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 45,624   45,624   35,669
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Commercial and Industrial [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 13,978   13,978   7,243
Increase (decrease) in loan investments     (6,200)    
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 41,253   41,253   25,536
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 4,607   4,607   9,371
Increase (decrease) in loan investments     5,500    
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 1,566   1,566   5,895
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 3,906   3,906   2,921
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Commercial Loan [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 1,105   1,105   610
Total Loans [Member] | Doubtful [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 9,111   9,111   9,113
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 9,111   9,111   5,345
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Commercial and Industrial [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 2,767   2,767   491
Increase (decrease) in loan investments     2,100    
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Energy Loans [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 6,052   6,052   4,843
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments 9,098   9,098   5,334
Total Loans [Member] | Doubtful [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments $ 245   $ 245    
Total Loans [Member] | Doubtful [Member] | ASC 310-30 [Member]          
Debt Instrument [Line Items]          
Carrying amount of loan investments         $ 3,768