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Summary of Significant Accounting Policies (Details)
12 Months Ended
Dec. 31, 2012
item
Number of locations 33
Common stock shares held in rabbi trust 150,000
Required percentage of aggregate principal amount of unpaid residential mortgage loans 0.35%
Shares authorized for issuance under the Plan 600,000
Service period 3 years
Regional Federal Home Loan Banks [Member]
 
Number of locations 12
Minimum [Member]
 
Investments in real estate limited partnerships ,percentage 3.30%
Maximum [Member]
 
Investments in real estate limited partnerships ,percentage 99.90%