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Securities Sold Under Agreement to Repurchase - Daily Securities Sold under Agreement to Repurchase (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amount Outstanding at End of Period	$ 69,756	$ 51,312
Daily Securities Sold Under Agreement to Repurchase [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amount Outstanding at End of Period	38,503	35,173	38,209
Weighted Average Rate End of Period	0.08%	0.10%	0.15%
Maximum Amount Borrowings Outstanding Month End	48,366	41,876	42,154
Approximate Average Outstanding in Period	38,859	38,725	36,910
Approximate Weighted Average Interest Rate For the Period	0.09%	0.18%	0.30%
Term CDs Sold Under Agreement to Repurchase [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amount Outstanding at End of Period	17,253	16,139	14,231
Weighted Average Rate End of Period	1.25%	1.25%	1.28%
Maximum Amount Borrowings Outstanding Month End	17,291	16,139	15,095
Approximate Average Outstanding in Period	$ 17,095	$ 14,184	$ 14,606
Approximate Weighted Average Interest Rate For the Period	1.25%	1.22%	1.25%

Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement.

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