Acquired Loans Part 4 (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 16, 2012	Dec. 31, 2011	Apr. 15, 2011
Allowance for loan loss [Abstract]
Balance, beginning	$ 502,000
Provision for loan losses, acquired loans	(194,000)
Loans charged-off	63,000
Recoveries	402,000
Net charge-offs	465,000
Balance, ending	773,000
Revolving credit agreements acquired		5,700,000		3,800,000
Total loans acquired subject to loss-share agreement with the FDIC				97,800,000
Total percentage of loans acquired subject to loss-share agreement with the FDIC (in hundredths)				91.00%
Nonaccrual loans not accounted for under FASB ASC Topic 310-30	561,000		491,000
Acquired Impaired [Member] | Covered Loans [Member]
Allowance for loan loss [Abstract]
Balance, beginning	502,000
Provision for loan losses, acquired loans	(248,000)
Loans charged-off	89,000
Recoveries	393,000
Net charge-offs	482,000
Balance, ending	736,000
Acquired Nonimpaired [Member] | Noncovered Loans [Member]
Allowance for loan loss [Abstract]
Balance, beginning	0
Provision for loan losses, acquired loans	54,000
Loans charged-off	(26,000)
Recoveries	9,000
Net charge-offs	(17,000)
Balance, ending	$ 37,000