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Fair Value of Financial Instruments (Narrative) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
security
Dec. 31, 2016
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 146,204 $ 149,561
Available-for-sale Securities $ 136,937 140,000
Collateralized debt obligations [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Acquired Trust Preferred Securities, Number of Securities | security 12  
Amortized Cost $ 27,790 27,930
Available-for-sale Securities $ 20,357 $ 20,254