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Derivative Instruments and Hedging Activities - Amount of Gain or Loss Recognized in Income on Derivatives (Detail) - Not Designated as Hedging Instruments - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]        
Total Derivatives Gain $ 8 $ 63 $ 303 $ 194
Interest Rate Swap Contracts - Commercial Loans        
Derivative Instruments, Gain (Loss) [Line Items]        
Total Derivatives Gain 23 (21) 120 (8)
Interest Rate Lock Commitments - Mortgage Loans        
Derivative Instruments, Gain (Loss) [Line Items]        
Total Derivatives Gain 117 (8) 382 128
Forward Sale Contracts - Mortgage Loans        
Derivative Instruments, Gain (Loss) [Line Items]        
Total Derivatives Gain $ (132) $ 92 $ (199) $ 74