Employee Benefit and Deferred Compensation Plans (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 31, 2013
Employee Benefit and Deferred Compensation Plans (Textual) [Abstract]
Company contribution to pension benefit plan	$ 0	$ 100,000
Accumulated benefit obligation	27,364,000	19,428,000
Retiring age limit, minimum	55 years
Retiring age limit, maximum	65 years
Eligible employee from service	15 years
Number of points for eligibility (points)	70
Minimum eligible age for Medicare coverage	65 years
Life insurance coverage face value	5,000
Life insurance maturity age	70 years
Additional life insurance maturity age	70 years
Health care cost trend rate	4.00%
Employee deferrals (percent)	4.00%
Percentage of plan compensation as nondiscretionary contribution (percent)	5.00%
Percentage of plan compensation in excess of social security wage base (percent)	5.00%
Hours of service credited to the employees during the year	1000 hours
Employee deferrals amounts	5,488,000	4,645,000	4,228,000
Incentive compensation plan expense	4,376,000	1,953,000
Company's deferred compensation plan expense	2,088,000	1,573,000	1,393,000
Option expiration period	10 years
Option exercisable period	3 years
Intrinsic value of options exercised	633,000	757,000	8,000
Fair Value of options vested in period	535,000	479,000	382,000
Common shares reserved for issuance under employee benefit plans (shares)	371,419
Supplemental Employee Retirement Plans, Defined Benefit
Employee Benefit and Deferred Compensation Plans (Textual) [Abstract]
Supplemental executive retirement liabilities totaled	2,842,000	2,451,000
Maximum | Other equity securities
Employee Benefit and Deferred Compensation Plans (Textual) [Abstract]
Equity income strategy	70.00%
Maximum | Debt Securities
Employee Benefit and Deferred Compensation Plans (Textual) [Abstract]
Equity income strategy	40.00%
Minimum | Other equity securities
Employee Benefit and Deferred Compensation Plans (Textual) [Abstract]
Equity income strategy	60.00%
Minimum | Debt Securities
Employee Benefit and Deferred Compensation Plans (Textual) [Abstract]
Equity income strategy	30.00%
Time- Based Restricted Stock
Employee Benefit and Deferred Compensation Plans (Textual) [Abstract]
Unrecognized stock-based compensation expense	405,000
Weighted average period over which unrecognized expense is expected to be recognized	1 year 9 months
Performance- Based Restricted Stock
Employee Benefit and Deferred Compensation Plans (Textual) [Abstract]
Compensation expense	2,330,000	830,000	134,000
Performance-based restricted stock based on the target level of performance goals (shares)				69,850
Additional shares issued (shares)				23,676
Shares awarded, other than options (shares)				93,526
Stock compensation plan
Employee Benefit and Deferred Compensation Plans (Textual) [Abstract]
Compensation expense	469,000	538,000	486,000
Unrecognized stock-based compensation expense	$ 334,000
Weighted average period over which unrecognized expense is expected to be recognized	1 year 2 months