Stock Based Compensation (Details) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Stock-Based Compensation [Abstract]
Maximum number of common stock authorizes for issuance (in shares)	500,000
Option Shares [Abstract]
Outstanding at beginning of period (in shares)	240,517
Granted (in shares)	0
Exercised (in shares)	17,475
Forfeited (in shares)	11,795
Expired (in shares)	4,000
Outstanding at end of period (in shares)	207,247
Exercisable at end of period (in shares)	207,247
Weighted Average Exercise Price [Abstract]
Outstanding at beginning of period (in dollars per share)	$ 24.28
Granted (in dollars per share)	$ 0
Exercised (in dollars per share)	$ 17.70
Forfeited (in dollars per share)	$ 27.64
Expired (in dollars per share)	$ 24.00
Outstanding at end of period (in dollars per share)	$ 24.65
Exercisable at end of period (in dollars per share)	$ 24.65
Weighted Average Remaining Contractual Term [Abstract]
Outstanding at end of period	3 years 1 month 2 days
Exercisable at end of period	3 years 1 month 2 days
Aggregate Intrinsic Value [Abstract]
Outstanding at end of period	$ 267,000
Exercisable at end of period	267,000
Unrecognized compensation expense	0
Weighted Average Grant Date Fair Value [Roll Forward]
Regular quarterly retainer director could receive in cash	3,000
Regular quarterly retainer if restricted stock vested	4,688
Monthly meeting fees a director could receive in cash	600
Monthly meeting fees a director could receive if restricted stock vested	750
Number of directors elected to receive stock in lieu of cash	11
Restricted Stock [Member]
Shares [Roll Forward]
Nonvested at beginning of period (in shares)	39,327
Granted (in shares)	12,121
Vested (in shares)	18,432
Forfeited (in shares)	0
Nonvested at end of period (in shares)	33,016
Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested at end of period (in dollars per share)	$ 20.17
Granted (in dollars per share)	$ 20.47
Vested (in dollars per share)	$ 21.44
Forfeited (in dollars per share)	$ 0
Nonvested at end of period (in dollars per share)	$ 19.58
Unrecognized compensation expense	383,000		525,000
Weighted average period for recognition of unrecognized compensation cost	1 year 2 months 12 days
Share based compensation expense	211,000	260,000
Number of shares issued (in shares)	9,968	14,217
Recognized share based compensation expense	$ 213,000	$ 308,000
Restricted Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum vesting period of granted restricted stock	36 months
Restricted Stock [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum vesting period of granted restricted stock	24 months