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Employee Thrift Plan (Details Textual) (Employee Thrift Plan [Member], USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employee Thrift Plan [Member]
Employee Thrift Plan (Textual) [Abstract]
Bank's expense related to the thrift plan	$ 566,000	$ 518,000	$ 459,000
Thrift Plan owns outstanding shares	301,127
Percentage of outstanding shares owns with thrift plan	3.50%

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Percentage of company shares owned by plan.

+ References

No definition available.

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The number of employer shares or related party shares included in plan assets.

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The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period).

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