| **Earnings per Share (Tables)**                                                                          | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
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| **Earnings Per Share [Abstract]**                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| Composition of Weighted-Average Common Shares (Denominator) Used in Basic and Diluted Earnings Per Share | The following table summarizes the composition of the weighted-average common shares (denominator) used in the basic and diluted earnings per share computations: For the Three-Months Ended September 30 For the Nine-Months Ended September 30 2013 2012 2013 2012Weighted average common shares issued105,563,455 105,563,455 105,563,455 105,563,455Average treasury shares(9,184,715) (1,258,029) (7,715,455) (738,769)Averaged unearned ESOP shares— (17,575) — (50,790)Average unearned nonvested shares(184,146) (207,826) (176,657) (180,771)Weighted average common shares and common stock equivalents used to calculate basic earnings per share96,194,594 104,080,025 97,671,343 104,593,125Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share13,951 16,874 4,009 2,224Additional common stock equivalents (stock options) used to calculate diluted earnings per share— 1,484 — 47Weighted average common shares and common stock equivalents used to calculate diluted earnings per share96,208,545 104,098,383 97,675,352 104,595,396 |
| Common Stock Equivalents Not Included in Computation of Diluted Earnings Per Share                       | The following table shows the number of shares and the price per share related to common stock equivalents that were not included in the computation of diluted earnings per share for the nine-months endedSeptember 30 because to do so would have been antidilutive. 2013 2012   Price Range   Price Range Shares From To Shares From ToStock Options31,954 $10.46 $14.55 293,777 $6.90 $14.55Restricted Stock92,181 5.96 7.57 93,565 5.96 6.82                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |

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| - Definition
Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
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| - Definition
Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257
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