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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Distributed earnings allocated to common stock |  |  |  |  |  |  |  |  | $ 23,100 | $ 20,603 | $ 20,102
Undistributed earnings allocated to common stock |  |  |  |  |  |  |  |  | 24,678 | 18,034 | 20,280
Net earnings allocated to common shareholders |  |  |  |  |  |  |  |  | $ 47,778 | $ 38,637 | $ 40,382
Average common shares outstanding | 15,636,000 | 15,608,000 | 15,582,000 | 15,473,000 | 14,755,000 | 14,751,000 | 14,680,000 | 14,679,000 | 15,564,000 | 14,714,000 | 15,055,000
Warrants Outstanding |  |  |  |  |  |  |  |  | 60,000 |  |
Employee Stock Options |  |  |  |  |  |  |  |  | 84,000 | 82,000 | 75,000
Shares for diluted earnings per share | 15,799,000 | 15,790,000 | 15,752,000 | 15,627,000 | 14,837,000 | 14,834,000 | 14,759,000 | 14,759,000 | 15,708,000 | 14,796,000 | 15,130,000
Basic earnings per share | $ 0.84 | $ 0.89 | $ 0.83 | $ 0.51 | $ 0.73 | $ 0.71 | $ 0.50 | $ 0.68 | $ 3.07 | $ 2.63 | $ 2.68
Diluted earnings per share | $ 0.83 | $ 0.88 | $ 0.82 | $ 0.51 | $ 0.73 | $ 0.71 | $ 0.50 | $ 0.67 | $ 3.04 | $ 2.61 | $ 2.67
Options to purchase shares of common stock, anti-dilutive |  |  |  |  |  |  |  |  | 0 | 124,000 | 222,000
Common stock exercise price, lower limit |  |  |  |  |  |  |  |  |  | $ 35.09 | $ 32.09
Common stock exercise price, upper limit |  |  |  |  |  |  |  |  |  | $ 40.88 | $ 40.88

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + 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=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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- Definition The total amount of dividends declared in the period for each class of stock and the contractual amount of dividends (or interest on participating income bonds) that must be paid for the period (for example, unpaid cumulative dividends). Dividends declared in the current period do not include dividends declared in respect of prior-period unpaid cumulative dividends. Preferred dividends that are cumulative only if earned are deducted only to the extent that they are earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780133-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60A -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780132-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2740-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 66 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2814-109256 + Details
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