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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, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Accretion/(amortization) of discount or premium $ 10 $ 11
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 8,037 9,359
Accretion/(amortization) of discount or premium 9 9
Sales/ payments received (1,034) (1,403)
Matured securities     
Increase/(decrease) in fair value of securities (590) 1,187
Ending balance 6,422 9,152
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 669 984
Accretion/(amortization) of discount or premium 1 2
Sales/ payments received     
Matured securities (325) (310)
Increase/(decrease) in fair value of securities     
Ending balance $ 345 $ 676