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Derivative Financial Instruments - Effect of Derivative Instruments on Consolidated Statement of Income Derivative in Fair Value Hedging Relationship (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative in Fair Value Hedging Relationship [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized on Derivative
Interest Income - Loans [Member] \| Derivative in Fair Value Hedging Relationship [Member] \| Interest Rate Contracts One [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized on Derivative	(326)	211	425	(1,635)
Interest Income - Loans [Member] \| Derivative in Fair Value Hedging Relationship [Member] \| Interest Rate Contracts Two [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized on Derivative	326	(211)	(425)	1,635
Derivatives Not Designated as Hedging Instruments [Member] \| Other income - Gain on Sale of Loans [Member] \| Mortgage Loan Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized on Derivative	$ (22)	$ 169	$ (1)	$ (239)