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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Statement of Stockholders' Equity [Abstract] |  |  |
Shares of common stock allocated by ESOP, including excess income tax benefits | 181,181 | 96,294 | 110,955
Shares of common stock issued under compensation plans, including excess income tax benefits | 3,294,995 | 1,349,914 | 916,329
Shares of common stock issued upon extinguishment of convertible senior notes | 5,489,808 |  |
Dividends on common stock (per share amount) | $ 0.18 | $ 0.15 | $ 0.12
Conversion of subordinated debentures | $ 0 | $ 20,770 | $ 0
Acquisition of shares of common stock |  |  | 48,235

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- Definition Number of shares of capital stock issued (purchased by employees) in connection with an employee stock ownership plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6418455&loc=d3e16649-113920 + Details
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