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Fair Value Measurements - Reconciliation of Items Using Level Three Inputs (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
Mortgage Servicing Rights  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning balance $ 671
Purchases 0
Impairments 0
Fair value adjustments 21
Ending balance 692
Corporate Bonds  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning balance 7,704
Purchases 0
Impairments 0
Fair value adjustments 11
Sales (1,000)
Ending balance $ 6,715