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Loans - Narrative Section (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
item
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]      
Fees and cost related to loans $ 5,400   $ 6,300
Carrying amount of loan investments 2,953,655 $ 2,592,047 2,860,921
Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 1,641,596   1,560,430
Non Accrual [Member]      
Debt Instrument [Line Items]      
Recorded investment, non-accrual status 33,700    
Increase (decrease) in non-accrual loans $ 3,000    
Percentage increase (decrease) in past due loans 9.80%    
Non ASC 310-30 [Member]      
Debt Instrument [Line Items]      
Loans held-for-sale $ 13,900   14,400
Carrying amount of loan investments 2,813,591   2,715,069
Allowance for Loan and Lease Losses, Write-offs 210 659  
Non ASC 310-30 [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 1,604,661   1,521,150
ASC 310-30 [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 140,064 $ 179,507 145,852
ASC 310-30 [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 36,935   39,280
Total Loans [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 2,953,655   2,860,921
Total Loans [Member] | Non ASC 310-30 [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 2,813,591   2,715,069
Recorded investment, non-accrual status 33,716   30,717
Total past due loans 25,576   19,435
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial and Industrial [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 1,150,688   1,074,696
Recorded investment, non-accrual status 9,710   8,688
Total past due loans 8,814   8,221
Total Loans [Member] | Non ASC 310-30 [Member] | Energy Loans [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 89,491   90,273
Recorded investment, non-accrual status 12,697   12,645
Total past due loans 6,621   6,550
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 1,604,661   1,521,150
Recorded investment, non-accrual status 27,852   25,294
Total past due loans 21,902   16,127
Total Loans [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 236,335   221,544
Recorded investment, non-accrual status 2,786   2,056
Total past due loans 3,933   855
Total Loans [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 294,793   309,068
Recorded investment, non-accrual status 36   66
Total past due loans 94   28
Total Loans [Member] | ASC 310-30 [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 140,064   145,852
Total Loans [Member] | ASC 310-30 [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 36,935   39,280
Total Loans [Member] | Substandard [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 94,137   116,558
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 51,344   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 24,768   25,636
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Energy Loans [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 7,357   7,811
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 40,215   45,490
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 4,399   10,137
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 1,608   2,251
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 42,793   59,634
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 8,230   11,234
Total Loans [Member] | Special Mention [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 59,590   38,590
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 56,173   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 5,009   7,243
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 51,773   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 $ 14,308   9,371
Number of loan relationships | item 2    
Increase (decrease) in loan investments $ 5,400    
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Agricultural Sector [Member]      
Debt Instrument [Line Items]      
Number of loan relationships | item 2    
Increase (decrease) in special mention loan investment     23,500
Total Loans [Member] | Special Mention [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments $ 1,577   5,895
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 3,417   2,921
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments $ 1,132   $ 610