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Fair Value Measurements - Reconciliation of Items Using Level Three Inputs (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 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 (68)
Sales 0
Ending balance 590
Corporate Bonds  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning balance 3,945
Purchases 3,000
Impairments 0
Fair value adjustments 58
Sales 0
Ending balance $ 7,003