Derivative and Hedging Activities - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2016 USD ($) cash_flow_hedge	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Estimated gain to be reclassified to interest income in the next twelve months	$ 2,200,000
Discontinued cash flow hedges | cash_flow_hedge	0
Gain (loss) reclassified into earnings due to discontinuance	$ 0
Derivatives in a net liability position	3,000		$ 110,000
Non Interest Income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) on derivative	24,000	$ 5,000
Non Interest Expenses
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) on derivative	(1,000)	$ (47,000)
Derivatives designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives in a net liability position	0
Derivatives designated as hedging instruments | Interest Rate Swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives in a net liability position	0
Derivatives designated as hedging instruments | Cash Flow Hedging | Interest Rate Swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives in a net liability position	$ 0