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Fair Value Measurements - Reconciliation of Items Using Level Three Inputs (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
Mortgage Servicing Rights  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning balance $ 658
Impairments 0
Fair value adjustments (10)
Sales 0
Ending balance 648
Corporate Bonds  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning balance 3,945
Purchases 495
Impairments 0
Fair value adjustments (1)
Sales 0
Ending balance $ 4,439