Reorganization and Acquisition Activity - Recognized Assets Acquired and Liabilities Assumed (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Sep. 17, 2011 Berkshire [Member]
Business Acquisition [Line Items]
Total purchase price			$ 11,274
Net assets acquired:
Cash			19,207
Restricted investments			947
Loans			97,014
Accrued interest receivable			276
Premises and equipment, net			3,416
Other real estate owned			1,817
Deferred tax assets			4,815
Other assets			2,989
Time deposits			(45,721)
Deposits other than time deposits			(76,145)
Accrued interest payable			(48)
Other liabilities			(922)
Net assets acquired			7,645
Goodwill resulting from Berkshire Merger	$ 3,676	$ 3,689	$ 3,629