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Loans and Asset Quality Information (Details 6) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Impaired loans at period end | $ 106,838 | $ 140,976 | $ 168,828
Average amount of impaired loans for period | 139,971 | 152,312 | 185,124
Impaired loans with related allowance - Related Allowance | 8,560 | 10,910 | 18,768
Impaired loans with no related allowance - Recorded Investment | 47,245 | 79,423 | 92,865
Non-covered |  |  |
Impaired loans at period end | 57,882 | 85,286 | 96,003
Average amount of impaired loans for period | 85,198 | 89,023 | 89,751
Impaired loans with related allowance - Related Allowance | 5,051 | 5,804 | 7,613
Impaired loans with no related allowance - Recorded Investment | 12,049 | 35,721 | 42,874
Covered |  |  |
Impaired loans at period end | 48,956 | 55,690 | 72,825
Average amount of impaired loans for period | 54,773 | 63,289 | 95,373
Impaired loans with related allowance - Related Allowance | 3,509 | 5,106 | 11,155
Impaired loans with no related allowance - Recorded Investment | $ 35,196 | $ 43,702 | $ 49,991

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5258-111524 + Details
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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953550-111524 + Details
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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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