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Commitments and Contingent Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Aug. 24, 2016
Dec. 31, 2015
Other Commitments [Line Items]        
Sale Leaseback Transaction, Deferred Gain, Gross     $ 742  
Sale Leaseback Transaction, Deferred Gain, Net $ 730 $ 730    
Commitments to Extend Credit [Member]        
Other Commitments [Line Items]        
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability 2,100,000 2,100,000   $ 1,930,000
Standby Letters of Credit [Member]        
Other Commitments [Line Items]        
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability 48,400 48,400   38,700
Commercial Letter of Credit and other off-balance sheet liabilities [Member]        
Other Commitments [Line Items]        
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability 6,600 6,600   $ 5,000
Branch consolidation [Member]        
Other Commitments [Line Items]        
Increase (Decrease) in Restructuring Reserve 849      
Restructuring and Related Cost, Incurred Cost $ 857 $ 883