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Fair Value Measurements - Rollforward of Level 3 Assets (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Servicing Asset at Amortized Cost, Period Increase (Decrease)   $ 0
Municipal bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance $ 1,139,000 1,166,000
Total (losses) or gains included in other comprehensive income (11,000) 43,000
Ending Balance $ 1,128,000 $ 1,209,000