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Fair Value Measurements - Reconciliation of Items Using Level Three Inputs (Detail)
$ in Thousands
12 Months Ended
Dec. 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 13
Sales 0
Ending balance 671
Corporate Bonds  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning balance 3,945
Purchases 3,750
Impairments 0
Fair value adjustments 9
Sales 0
Ending balance $ 7,704