Employee Benefit Plans (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Components of net periodic benefit cost [Abstract]
Obligation included in other liabilities	$ 7,754,000		$ 7,754,000		$ 7,712,000
Employer contribution to defined contribution plan	80,000	74,000	132,000	124,000
Restricted Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under restricted stock plan (in shares)	100,000		100,000
Restricted stock awarded (in shares)			3,808	3,968
Restricted stock vested (in shares)			5,222	5,502
Share-based compensation expense	33,000	36,000	66,000	73,000
Director [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Deferred compensation liability	996,000		996,000		1,030,000
Deferred interest expense			8,000	12,000
Pension Plan [Member]
Components of net periodic benefit cost [Abstract]
Service cost	54,000	71,000	167,000	185,000
Interest cost	35,000	87,000	174,000	226,000
Expected return on plan assets	(80,000)	(130,000)	(286,000)	(336,000)
Net amortization and deferral	52,000	10,000	68,000	26,000
Net periodic benefit cost	61,000	38,000	123,000	101,000
Expected employer contribution to pension plan	750,000		750,000
Supplemental Executive Retirement Plans [Member]
Components of net periodic benefit cost [Abstract]
Obligation included in other liabilities	855,000		855,000		778,000
Cost recognized	$ 24,000	$ 16,000	$ 47,000	$ 31,000