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Loans - Impaired Loans Narrative (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
item
loan
Dec. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
Debt Instrument [Line Items]      
Carrying amount of loan investments $ 2,953,655 $ 2,860,921 $ 2,592,047
Impaired loans 25,500    
Recorded investment of impaired loans $ 41,103 38,282  
Number of loans resulting in increase to impaired loans | loan 7    
Collective related allowance for loan losses for impaired loans $ 2,916 2,408  
Non Accrual [Member]      
Debt Instrument [Line Items]      
Investment in impaired loans not covered by loan loss, non-accrual status 33,700    
Fair Value Of Collateral Pledged [Member]      
Debt Instrument [Line Items]      
Impaired loans 30,600    
Discounted Cash Flows [Member]      
Debt Instrument [Line Items]      
Impaired loans 2,600    
General Reserve [Member]      
Debt Instrument [Line Items]      
Impaired loans 7,900    
Individual loan amount of impaired loans 250    
Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments $ 1,641,596 $ 1,560,430  
Commercial and Industrial [Member]      
Debt Instrument [Line Items]      
Number of loans resulting in increase to impaired loans | item 3    
Commercial and Industrial [Member] | Non Accrual [Member]      
Debt Instrument [Line Items]      
Individual loan amount of impaired loans $ 1,300    
Number of loans resulting in increase to impaired loans | item 1    
Energy Loans [Member]      
Debt Instrument [Line Items]      
Number of loans resulting in increase to impaired loans | item 3    
Agricultural Sector [Member]      
Debt Instrument [Line Items]      
Number of loans resulting in increase to impaired loans | item 1    
Owner-Occupied [Member] | Non Accrual [Member]      
Debt Instrument [Line Items]      
Individual loan amount of impaired loans $ 1,500    
Number of loans resulting in increase to impaired loans | item 2