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Earnings Per Common Share And Stock Options (Narrative) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2012 | Dec. 31, 2011
Earnings Per Common Share And Share Awards [Line Items] |  |  |  |
Incremental dilutive potential common shares, calculated using treasury stock method |  |  | 35,090 | 18,286
Anti-dilutive shares excluded from computation of diluted earnings per share |  |  | 0 | 11,500
SARs and options vesting period |  |  | 1 year |
Intrinsic values of options exercised |  |  | $ 153,000 | $ 118,000
Options and SARs vested |  |  | 3,900 |
Fair value of options and SARs vested |  |  | 64,700 |
Shares issued in period | 3,000 | 3,000 |  |
Weighted-average fair values of stock appreciation rights issued |  |  | $ 18.84 | $ 15.55
Compensation expense relating to SARs or options vesting |  |  | 75,000 | 214,000
Total unrecognized compensation cost related to unvested share-based compensation arrangements granted under stock award plans |  |  | $ 24,000 |
Weighted-average period of unrecognized compensation cost recognition |  |  | 4 months |
Minimum [Member] |  |  |  |
Earnings Per Common Share And Share Awards [Line Items] |  |  |  |
Annual rate at which stock appreciation rights and options are exercisable and vest |  |  | 10.00% |
SARs and options expiration period |  |  | 5 years |
Maximum [Member] |  |  |  |
Earnings Per Common Share And Share Awards [Line Items] |  |  |  |
Maximum shares of Company stock to be granted to key employees or directors |  |  | 500,000 |
Annual rate at which stock appreciation rights and options are exercisable and vest |  |  | 20.00% |
SARs and options expiration period |  |  | 10 years |

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