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Fair Value - Reconciliation of All Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Accretion of discount $ 9 $ 9
Significant Unobservable Inputs (Level 3) [Member] | Pooled Trust Preferred Securities Available-for-Sale [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 7,900 6,607
Accretion of discount 9 9
Sales/payments received (270) (514)
Decrease in fair value of securities (919) 994
Ending balance $ 6,720 7,096
Significant Unobservable Inputs (Level 3) [Member] | States and Political Subdivisions [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance   325
Matured securities   $ (325)