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Loans - Narrative Section (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Debt Instrument [Line Items]      
Carrying amount of loan investments $ 4,246,941 $ 4,092,308 $ 3,702,334
Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 2,756,144 2,644,571  
Non Accrual [Member]      
Debt Instrument [Line Items]      
Recorded investment, non-accrual status 26,300    
Increase (decrease) in non-accrual loans $ 1,900    
Percentage increase (decrease) in past due loans 7.60%    
Originated and acquired loans [Member]      
Debt Instrument [Line Items]      
Fees and cost related to loans $ 10,100 10,200  
Carrying amount of loan investments 4,183,414 4,021,429  
Originated and acquired loans [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 2,737,005 2,624,173  
ASC 310-30 [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 63,527 70,879 $ 112,309
ASC 310-30 [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 19,139 20,398  
Total Loans [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 4,246,941 4,092,308  
Total Loans [Member] | Originated and acquired loans [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 4,183,414 4,021,429  
Recorded investment, non-accrual status 26,310 24,456  
Total Loans [Member] | Originated and acquired loans [Member] | Commercial and Industrial [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 2,019,886 1,931,147  
Recorded investment, non-accrual status 6,136 5,510  
Total Loans [Member] | Originated and acquired loans [Member] | Energy Loans [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 55,368 49,204  
Recorded investment, non-accrual status 804 742  
Total Loans [Member] | Originated and acquired loans [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 2,737,005 2,624,173  
Recorded investment, non-accrual status 14,409 13,951  
Total Loans [Member] | Originated and acquired loans [Member] | Owner-Occupied [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 428,723 421,666  
Recorded investment, non-accrual status 6,710 6,931  
Total Loans [Member] | Originated and acquired loans [Member] | Non Owner-Occupied [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 435,743 380,630  
Recorded investment, non-accrual status 897 572  
Total Loans [Member] | ASC 310-30 [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 63,527 70,879  
Total Loans [Member] | ASC 310-30 [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 19,139 20,398  
Total Loans [Member] | Substandard [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 50,388 53,527  
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 46,006 48,724  
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Commercial and Industrial [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 18,934 22,919  
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Energy Loans [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 804 742  
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 32,413 36,336  
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Owner-Occupied [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 11,457 11,828  
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Non Owner-Occupied [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 1,563 1,611  
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 4,382 4,803  
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 2,169 2,282  
Total Loans [Member] | Special Mention [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 62,530 63,975  
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 60,921 62,284  
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Commercial and Industrial [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 19,051 16,531  
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 40,212 34,140  
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Owner-Occupied [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 19,941 16,349  
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Non Owner-Occupied [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 15,122 23,243  
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 1,609 1,691  
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 518 537  
Total Loans [Member] | Doubtful [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 1,491 1,117  
Total Loans [Member] | Doubtful [Member] | Originated and acquired loans [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 1,491 1,117  
Total Loans [Member] | Doubtful [Member] | Originated and acquired loans [Member] | Commercial and Industrial [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 1,337 987  
Total Loans [Member] | Doubtful [Member] | Originated and acquired loans [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 1,454 1,117  
Total Loans [Member] | Doubtful [Member] | Originated and acquired loans [Member] | Owner-Occupied [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 85 $ 85  
Total Loans [Member] | Doubtful [Member] | Originated and acquired loans [Member] | Non Owner-Occupied [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments $ 37