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Investment Securities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 30, 2011
Investment [Line Items]
Amortized Cost	$ 120,311		$ 108,921
Gross Unrealized Gains	2,811		2,658
Gross Unrealized Losses	149		139
Fair Value	122,973	111,440	111,440
Amortized Cost	12	16
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	12	16
Agency mortgage-backed securities
Investment [Line Items]
Amortized Cost	22,762		11,689
Gross Unrealized Gains	456		542
Gross Unrealized Losses	12		11
Fair Value	23,206		12,220
Amortized Cost	12	16
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	12	16
Agency Collateralized Mortgage Obligations
Investment [Line Items]
Amortized Cost	22,458		23,196
Gross Unrealized Gains	225		152
Gross Unrealized Losses	23		60
Fair Value	22,660		23,288
Collateralized Mortgage Obligations Issued By Private Enterprise
Investment [Line Items]
Amortized Cost			896
Gross Unrealized Gains			16
Gross Unrealized Losses			32
Fair Value			880
Agency CMO
Investment [Line Items]
Amortized Cost	38,273		41,971
Gross Unrealized Gains	290		395
Gross Unrealized Losses	10		3
Fair Value	38,553		42,363
Municipal Obligations
Investment [Line Items]
Amortized Cost	32,605		25,800
Gross Unrealized Gains	1,800		1,501
Gross Unrealized Losses	88		0
Fair Value	34,317		27,301
Debt Securities
Investment [Line Items]
Amortized Cost	116,098		103,552
Gross Unrealized Gains	2,771		2,606
Gross Unrealized Losses	133		106
Fair Value	118,736		106,052
Mutual fund investment
Investment [Line Items]
Amortized Cost	4,213		5,369
Gross Unrealized Gains	40		52
Gross Unrealized Losses	16		33
Fair Value	$ 4,237		$ 5,388

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