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Selected Quarterly Information (Tables) | 12 Months Ended
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Dec. 31, 2012
Selected Quarterly Financial Information [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] |
| Year Ended December 31, 2012
| First Quarter | Second Quarter | Third Quarter | Fourth Quarter
Operating results: |  |  |  |
Net interest income | $ | 19,147 |  | $ | 19,008 |  | $ | 19,100 |  | $ | 21,145 |
Net interest income after provision for loan losses | 19,087 |  | 19,008 |  | 18,990 |  | 21,123 |
Net income to common shareholders | 16,476 |  | 18,847 |  | 18,353 |  | 18,330 |
Basic diluted net income per common share | $ | 0.33 |  | $ | 0.35 |  | $ | 0.34 |  | $ | 0.34 |
Diluted net income per common share | $ | 0.33 |  | $ | 0.35 |  | $ | 0.34 |  | $ | 0.34 |
Cash dividends declared per common share | $ | 0.28 |  | $ | 0.29 |  | $ | 0.29 |  | $ | 0.29 |
| Year Ended December 31, 2011
| First Quarter | Second Quarter | Third Quarter | Fourth Quarter
Operating results: |  |  |  |
Net interest income | $ | 12,731 |  | $ | 15,033 |  | $ | 14,559 |  | $ | 16,972 |
Net interest income after provision for loan losses | 12,481 |  | 14,833 |  | 14,259 |  | 16,851 |
Net income | 10,280 |  | 13,594 |  | 1,532 |  | 14,406 |
Basic net income per common share | $ | 0.31 |  | $ | 0.34 |  | $ | 0.04 |  | $ | 0.36 |
Diluted net income per common share | $ | 0.31 |  | $ | 0.34 |  | $ | 0.04 |  | $ | 0.36 |
Cash dividends declared per common share | $ | 0.27 |  | $ | 0.27 |  | $ | 0.27 |  | $ | 0.28 |
| Year Ended December 31, 2010
| First Quarter | Second Quarter | Third Quarter | Fourth Quarter
Operating results: |  |  |  |
Net interest income | $ | 7,197 |  | $ | 7,932 |  | $ | 8,400 |  | $ | 10,895 |
Net interest income after provision for loan losses | 6,788 |  | 7,782 |  | 8,190 |  | 10,285 |
Net income to common shareholders | 4,534 |  | 6,264 |  | 5,966 |  | 9,647 |
Basic net income per common share | $ | 0.32 |  | $ | 0.41 |  | $ | 0.35 |  | $ | 0.41 |
Diluted net income per common share | $ | 0.30 |  | $ | 0.38 |  | $ | 0.33 |  | $ | 0.40 |
Cash dividends declared per common share | $ | 0.23 |  | $ | 0.23 |  | $ | 0.25 |  | $ | 0.27 |

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=20225539&loc=d3e1280-108306 + Details
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