Employee Benefit Plans (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Components of net periodic benefit cost [Abstract]
Obligation included in other liabilities	$ 7,865,000		$ 7,865,000		$ 7,712,000
Employer contribution to defined contribution plan	52,000	47,000	184,000	171,000
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	37,000	36,000	103,000	109,000
Director [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Deferred compensation liability	999,000		999,000		1,030,000
Deferred interest expense			12,000	17,000
Pension Plan [Member]
Components of net periodic benefit cost [Abstract]
Service cost	82,000	71,000	249,000	256,000
Interest cost	85,000	88,000	259,000	314,000
Expected return on plan assets	(139,000)	(129,000)	(425,000)	(465,000)
Net amortization and deferral	34,000	10,000	102,000	36,000
Net periodic benefit cost	62,000	40,000	185,000	141,000
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	878,000		878,000		809,000
Cost recognized	$ 23,000	$ 15,000	$ 69,000	$ 46,000