Earnings Per Common Share and Share Awards (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	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 (in shares)	20,459	35,090	18,286
Anti-dilutive shares excluded from computation of diluted earnings per share	0	0	11,500
SARs and options vesting period	1 year
Intrinsic values of options exercised	$ 3,486,000	$ 153,000	$ 118,000
Options and SARs vested	3,250
Fair value of options and SARs vested	79,755
Share-settled SARs to directors (in shares)	3,000	3,000	3,000
Weighted-average fair values for SARs issued (dollars per share)	$ 27.55	$ 18.84	$ 15.55
Compensation expense relating to SARs or options vesting	84,000	75,000	214,000
Total unrecognized compensation cost related to unvested share-based compensation arrangements granted under stock award plans	$ 23,000
Weighted-average period of unrecognized compensation cost recognition	3 months
Number of stock options or SARs granted where exercise price was less than market price on date of grant	0
Minimum
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
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