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Loans - Narrative Section (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Debt Instrument [Line Items]      
Fees and cost related to loans $ 11,200   $ 4,300
Carrying amount of loan investments 3,702,334 $ 2,953,655 3,178,947
Increase in Non Accrual from acquisition 5,700    
Commercial and Industrial [Member]      
Debt Instrument [Line Items]      
Loans Placed on Accrual 2,300    
Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 2,105,899   1,874,605
Non Accrual [Member]      
Debt Instrument [Line Items]      
Recorded investment, non-accrual status 23,700    
Increase (decrease) in non-accrual loans $ 2,700    
Percentage increase (decrease) in past due loans 12.70%    
Originated and acquired loans [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments $ 3,590,025   3,058,324
Allowance for Loan and Lease Losses, Write-offs 716 210  
Originated and acquired loans [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 2,081,197   1,845,130
ASC 310-30 [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 112,309 $ 140,064 120,623
ASC 310-30 [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 24,702   29,475
Substandard [Member] | Originated and acquired loans [Member]      
Debt Instrument [Line Items]      
Increase (decrease) in carrying amount of loan investments 14,200    
Special Mention [Member] | Originated and acquired loans [Member]      
Debt Instrument [Line Items]      
Increase (decrease) in carrying amount of loan investments 15,300    
Total Loans [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 3,702,334   3,178,947
Total Loans [Member] | Originated and acquired loans [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 3,590,025   3,058,324
Recorded investment, non-accrual status 23,669   21,000
Total past due loans 16,130   13,557
Total Loans [Member] | Originated and acquired loans [Member] | Commercial and Industrial [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 1,495,088   1,376,022
Recorded investment, non-accrual status 5,302   7,767
Total past due loans 2,413   2,060
Total Loans [Member] | Originated and acquired loans [Member] | Energy Loans [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 40,213   57,460
Recorded investment, non-accrual status 923   1,645
Total past due loans 923   1,645
Total Loans [Member] | Originated and acquired loans [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 2,081,197   1,845,130
Recorded investment, non-accrual status 15,530   14,893
Total past due loans 7,985   7,670
Total Loans [Member] | Originated and acquired loans [Member] | Owner-Occupied [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 384,247   272,753
Recorded investment, non-accrual status 7,202   3,478
Total past due loans 3,764   2,679
Total Loans [Member] | Originated and acquired loans [Member] | Non Owner-Occupied [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 448,502   336,098
Recorded investment, non-accrual status 613   605
Total past due loans 10   630
Total Loans [Member] | ASC 310-30 [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 112,309   120,623
Total Loans [Member] | ASC 310-30 [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 24,702   29,475
Total Loans [Member] | Substandard [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 79,523   66,329
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 47,815   33,613
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Commercial and Industrial [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 20,219   14,824
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Energy Loans [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 923   1,646
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 33,192   23,764
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Owner-Occupied [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 10,148   5,424
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Non Owner-Occupied [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 2,932   1,477
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 31,708   32,716
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 3,783   4,451
Total Loans [Member] | Special Mention [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 66,518   51,188
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 63,451   48,171
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Commercial and Industrial [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 13,070   10,829
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 42,050   46,683
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Owner-Occupied [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 25,493   17,030
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Non Owner-Occupied [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 15,133   1,396
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 3,067   3,017
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 1,073   1,070
Total Loans [Member] | Doubtful [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 1,177   1,461
Total Loans [Member] | Doubtful [Member] | Originated and acquired loans [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 1,177   1,461
Total Loans [Member] | Doubtful [Member] | Originated and acquired loans [Member] | Commercial and Industrial [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 903   1,253
Total Loans [Member] | Doubtful [Member] | Originated and acquired loans [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 1,177   1,461
Total Loans [Member] | Doubtful [Member] | Originated and acquired loans [Member] | Owner-Occupied [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments $ 73   $ 75