Derivative and Hedging Activities - Summary of Derivative Instrument Contracts at Fair Value and Balance Sheet Classification(Detail) $ in Thousands	Mar. 31, 2016 USD ($) derivative_instrument	Dec. 31, 2015 USD ($)
Derivatives, Fair Value [Line Items]
Gross asset value of derivatives	$ 5,683	$ 933
Asset Derivatives, Notional Amount	241,316	171,967
Liability Derivatives, Fair Value	3	110
Liability Derivatives, Notional Amount	1,368	71,213
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Gross asset value of derivatives	5,667
Liability Derivatives, Fair Value	0
Derivatives designated as hedging instruments | Interest rate swap
Derivatives, Fair Value [Line Items]
Gross asset value of derivatives	5,667
Liability Derivatives, Fair Value	$ 0
Derivatives designated as hedging instruments | Interest rate swap | Other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives, Number of Instruments Held | derivative_instrument	4
Gross asset value of derivatives	$ 5,667	893
Asset Derivatives, Notional Amount	$ 235,000	165,000
Derivatives designated as hedging instruments | Interest rate swap | Other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives, Number of Instruments Held | derivative_instrument	0
Liability Derivatives, Fair Value	$ 0	108
Liability Derivatives, Notional Amount	$ 0	70,000
Derivatives not designated as hedging instruments | Forward loan sales contracts | Other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives, Number of Instruments Held | derivative_instrument	29
Gross asset value of derivatives	$ 16	40
Asset Derivatives, Notional Amount	$ 6,316	6,967
Derivatives not designated as hedging instruments | Forward loan sales contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives, Number of Instruments Held | derivative_instrument	6
Liability Derivatives, Fair Value	$ 3	2
Liability Derivatives, Notional Amount	$ 1,368	$ 1,213