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Fair Value of Financial Instruments (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Acquired Trust Preferred Securities, Number of Securities | security 12  
Trust Preferred Securities, Amortized Cost $ 27,900  
Trust Preferred Securities, Fair Value 20,300  
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount 0 $ 0
Collateralized debt obligations [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Impairment losses $ 3,200