Investment Securities, Securities Sales And Continuous Unrealized Loss Position Of Securities Held (Details) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Proceeds from sales of securities available for sale and the associated realized securities gains and losses [Abstract]
Proceeds		$ 7,457,000	$ 44,142,000	$ 12,500,000
Gross realized gains		0	1,701,000	391,000
Gross realized losses		217,000	53,000	16,000
Net gains		(217,000)	1,648,000	375,000
Length of time individual securities for held-to-maturity and available-for-sale held in a continuous unrealized loss position [Abstract]
Number of Securities	2	12	2
Less than 12 months Fair Value	0	50,934,000	0
Less than 12 months Unrealized Losses	0	223,000	0
12 months or longer Fair Value	7,994,000	0	7,994,000
12 months or longer Unrealized Losses	1,153,000	0	1,153,000
Total Fair Value	7,994,000	50,934,000	7,994,000
Total Unrealized Losses	1,153,000	223,000	1,153,000
Written down due to other than temporary impairment evident	1,100,000		1,100,000
U.S. Government Agency Securities [Member]
Length of time individual securities for held-to-maturity and available-for-sale held in a continuous unrealized loss position [Abstract]
Number of Securities		6
Less than 12 months Fair Value		28,958,000
Less than 12 months Unrealized Losses		77,000
12 months or longer Fair Value		0
12 months or longer Unrealized Losses		0
Total Fair Value		28,958,000
Total Unrealized Losses		77,000
Collateralized Mortgage Obligations [Member]
Length of time individual securities for held-to-maturity and available-for-sale held in a continuous unrealized loss position [Abstract]
Number of Securities	2	2	2
Less than 12 months Fair Value	0	7,878,000	0
Less than 12 months Unrealized Losses	0	80,000	0
12 months or longer Fair Value	7,994,000	0	7,994,000
12 months or longer Unrealized Losses	1,153,000	0	1,153,000
Total Fair Value	7,994,000	7,878,000	7,994,000
Total Unrealized Losses	1,153,000	80,000	1,153,000
Mortgage-Backed Securities [Member]
Length of time individual securities for held-to-maturity and available-for-sale held in a continuous unrealized loss position [Abstract]
Number of Securities		4
Less than 12 months Fair Value		14,098,000
Less than 12 months Unrealized Losses		66,000
12 months or longer Fair Value		0
12 months or longer Unrealized Losses		0
Total Fair Value		14,098,000
Total Unrealized Losses		$ 66,000