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Derivative Hedging Instruments - Summary of Interest Rate Swap Transactions (Detail) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Derivative Financial Instruments, Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net Exposure, Notional Amount	$ 28,958,000	$ 29,060,000
Weighted Average Rate Received(Paid)	5.47%	5.47%
Net Exposure, Impact of a 1 basis point change in interest rates	19,000	19,000
Repricing Frequency	Monthly	Monthly
Derivative Financial Instruments, Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net Exposure, Notional Amount	(28,958,000)	(29,060,000)
Weighted Average Rate Received(Paid)	5.47%	5.47%
Net Exposure, Impact of a 1 basis point change in interest rates	$ (19,000)	$ (19,000)
Repricing Frequency	Monthly	Monthly