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Derivative Instruments and Hedging Activities - Value of Derivative Assets and Derivative Liabilities (Detail) - Not Designated as Hedging Instruments [Member] - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Derivatives not Designated as Hedging Instruments    
Fair value, Derivatives (included in Other Assets) $ 11,013 $ 12,981
Fair value, Derivatives (included in Other Liabilities) 10,994 12,953
Other Assets [Member] | Interest Rate Swap Contracts-Commercial Loans [Member]    
Derivatives not Designated as Hedging Instruments    
Fair value, Derivatives (included in Other Assets) 11,013 12,981
Notional amount, Derivatives (included in Other Assets) 233,777 245,152
Other Assets [Member] | Interest Rate Lock Commitments [Member]    
Derivatives not Designated as Hedging Instruments    
Fair value, Derivatives (included in Other Assets) 366 235
Notional amount, Derivatives (included in Other Assets) 14,034 8,822
Other Assets [Member] | Forward Sale Contracts-Mortgage Loans [Member]    
Derivatives not Designated as Hedging Instruments    
Fair value, Derivatives (included in Other Assets) 17  
Notional amount, Derivatives (included in Other Assets) 13,812  
Other Liabilities [Member] | Interest Rate Swap Contracts-Commercial Loans [Member]    
Derivatives not Designated as Hedging Instruments    
Collateral posted 12,489 12,059
Fair value, Derivatives (included in Other Liabilities) 10,994 12,953
Notional amount, Derivatives (included in Other Liabilities) $ 233,777 245,152
Other Liabilities [Member] | Forward Sale Contracts-Mortgage Loans [Member]    
Derivatives not Designated as Hedging Instruments    
Fair value, Derivatives (included in Other Liabilities)   57
Notional amount, Derivatives (included in Other Liabilities)   $ 7,789