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Derivatives - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Derivatives
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Derivatives
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Risk participation Agreements [Line Items]          
HedgedItemsOfCashFlowHedge $ 200,000   $ 200,000    
Derivative Instruments Designated As Hedging Instruments Interest Income $ 557 $ 0 $ 938 $ 0  
Risk Participation Agreements Purchased [Domain]          
Risk participation Agreements [Line Items]          
Number of interest rate swaps | Derivatives 15   15    
Risk Participation Agreements Sold [Domain]          
Risk participation Agreements [Line Items]          
Number of interest rate swaps | Derivatives 3   3    
Designated as Hedging Instrument [Member]          
Risk participation Agreements [Line Items]          
Derivative, Notional Amount $ 200,000   $ 200,000   $ 100,000
Three Year Maturity [Member] | Designated as Hedging Instrument [Member]          
Risk participation Agreements [Line Items]          
Derivative, Notional Amount 85,000   85,000    
Four Year Maturity [Member] | Designated as Hedging Instrument [Member]          
Risk participation Agreements [Line Items]          
Derivative, Notional Amount $ 115,000   $ 115,000