Borrowing Arrangements (Details 2) (Securities sold under agreements to repurchase, USD $)
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12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Securities sold under agreements to repurchase
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Securities sold under agreements to repurchase | |||
Maturity period | 2 years 6 months | ||
Average balance during the year | $ 712,000 | $ 18,767,000 | |
Average interest rate during the year (as a percent) | 0.00% | 3.37% | 2.23% |
Maximum month-end balance during the year | $ 5,000,000 | $ 25,000,000 | |
Average rate at December 31 (as a percent) | 3.09% |