Investment Securities, Part II (Details) (USD $)	6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale, one year or less	$ 104,160,000
Available-for-sale, after 1 through 5 years	292,719,000
Available-for-sale, after 5 through 10 years	112,046,000
Available-for-sale, after ten years	1,102,000
Available-for-sale, Weighted Average Yield, Maturities Year One (in hundredths)	2.34%
Available-for-sale , Weighted Average Yield, Maturities After 1 through 5 Years (in hundredths)	2.98%
Available-for-sale, Weighted Average Yield, Maturities After 5 through 10 Years (in hundredths)	3.03%
Available-for-sale , Weighted Average Yield, Maturities After 10 Years (in hundredths)	4.00%
Available-for-sale , Weighted Average Yield, Maturities (in hundredths)	2.81%
Available-for-sale, Full Tax-equivalent Yield, Maturities Year One (in hundredths)	2.35%
Available-for-sale, Full Tax-equivalent Yield, Maturities After 1 through 5 Years (in hundredths)	3.10%
Available-for-sale, Full Tax-equivalent Yield, Maturities After 5 through 10 years (in hundredths)	3.72%
Available-for-sale, Full Tax-equivalent Yield, Maturities After Ten Years (in hundredths)	4.28%
Available-for-sale, Full Tax-equivalent Yield, Maturities (in hundredths)	2.97%
Held-to-maturity, Debt Maturities at Fair Value [Abstract]
Held-to-maturity, one year or less	0
Held-to-maturity, after 1 through 5 years	51,000
Held-to-maturity, after 5 through 10 years	0
Held-to-maturity, after ten years	0
Held-to-maturity, Weighted Average Yield, Maturities Year One (in hundredths)	0.00%
Held-to-maturity, Weighted Average Yield Maturities After 1 Through 5 Years (in hundredths)	4.75%
Held-to-maturity, Weighted Average Yield Maturities After 5 Through 10 Years (in hundredths)	0.00%
Held-to-maturity, Weighted Average Yield Maturities After 10 Years (in hundredths)	0.00%
Held-to-maturity , Weighted Average Yield, Maturities (in hundredths)	4.75%
Held-to-maturity, Full Tax-equivalent Yield, Maturities Year One (in hundredths)	0.00%
Held-to-maturity, Full Tax-equivalent Yield, Maturities After 1 through 5 Years (in hundredths)	6.58%
Held-to-maturity, Full Tax-equivalent Yield, Maturities After 5 through 10 years (in hundredths)	0.00%
Held-to-maturity, Full Tax-equivalent Yield, Maturities After Ten Years (in hundredths)	0.00%
Held-to-maturity, Full Tax-equivalent Yield, Maturities (in hundredths)	6.58%
Tax rate used to calculate tax-equivalent yields (in hundredths)	34.00%
Investment Securities Pledged as Collateral	276,748,000		286,568,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, Fair Value	59,230,000		43,071,000
Less than 12 months, Unrealized Losses	(305,000)		(449,000)
12 months or longer, Fair Value	2,505,000		2,625,000
12 months or longer, Unrealized losses	(4,744,000)		(4,999,000)
Total Fair Value	61,735,000		45,696,000
Total Unrealized Losses	(5,049,000)		(5,448,000)
Trust Preferred Securities [Abstract]
Number of trust preferred securities	4
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Total	4,116,000
Details of Trust Preferred Securities [Abstract]
Book Value	5,372,000
Market Value	648,000
Unrealized Loss	(4,724,000)
Other than Temporary Impairment Recorded to-date	4,116,000
PreTSL I [Member]
Details of Trust Preferred Securities [Abstract]
Book Value	647,000
Market Value	285,000
Unrealized Loss	(362,000)
Other than Temporary Impairment Recorded to-date	691,000
PreTSL II [Member]
Details of Trust Preferred Securities [Abstract]
Book Value	950,000
Market Value	207,000
Unrealized Loss	(743,000)
Other than Temporary Impairment Recorded to-date	2,187,000
PreTSL VI [Member]
Details of Trust Preferred Securities [Abstract]
Book Value	123,000
Market Value	(743,000)
Unrealized Loss	7,000
Other than Temporary Impairment Recorded to-date	127,000
PreTSL XXVIII [Member]
Details of Trust Preferred Securities [Abstract]
Book Value	3,652,000
Market Value	2,187,000
Unrealized Loss	(3,626,000)
Other than Temporary Impairment Recorded to-date	1,111,000
U.S. Treasury Securities and Obligations of U.S. Government Corporations & Agencies [Member]
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale, one year or less	89,227,000
Available-for-sale, after 1 through 5 years	60,568,000
Available-for-sale, after 5 through 10 years	2,255,000
Available-for-sale, after ten years	0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, Fair Value	19,941,000		19,960,000
Less than 12 months, Unrealized Losses	(52,000)		(40,000)
12 months or longer, Fair Value	0		0
12 months or longer, Unrealized losses	0		0
Total Fair Value	19,941,000		19,960,000
Total Unrealized Losses	(52,000)		(40,000)
Obligations of States and Political Subdivisions [Member]
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale, one year or less	877,000
Available-for-sale, after 1 through 5 years	20,578,000
Available-for-sale, after 5 through 10 years	27,130,000
Available-for-sale, after ten years	406,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, Fair Value	2,890,000		690,000
Less than 12 months, Unrealized Losses	(26,000)		0
12 months or longer, Fair Value	0		0
12 months or longer, Unrealized losses	0		0
Total Fair Value	2,890,000		690,000
Total Unrealized Losses	(26,000)		0
Mortgage-backed Securities: GSE Residential [Member]
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale, one year or less	14,056,000
Available-for-sale, after 1 through 5 years	204,019,000
Available-for-sale, after 5 through 10 years	80,760,000
Available-for-sale, after ten years	0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, Fair Value	32,833,000		15,231,000
Less than 12 months, Unrealized Losses	(91,000)		(37,000)
12 months or longer, Fair Value	0		0
12 months or longer, Unrealized losses	0		0
Total Fair Value	32,833,000		15,231,000
Total Unrealized Losses	(91,000)		(37,000)
Trust Preferred Securities [Member]
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale, one year or less	0
Available-for-sale, after 1 through 5 years	0
Available-for-sale, after 5 through 10 years	0
Available-for-sale, after ten years	648,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, Fair Value	0		0
Less than 12 months, Unrealized Losses	0		0
12 months or longer, Fair Value	518,000		719,000
12 months or longer, Unrealized losses	(4,731,000)		(4,906,000)
Total Fair Value	518,000		719,000
Total Unrealized Losses	(4,731,000)		(4,906,000)
Trust Preferred Securities [Abstract]
Number of trust preferred securities	3		4
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Total	4,116,000	3,476,000
Credit losses on trust preferred securities held [Abstract]
Beginning of period	4,116,000	3,230,000	3,230,000
Additions related to OTTI losses not previously recognized	0	0
Reductions due to sales	0	0
Reductions due to change in intent or likelihood of sale	0	0
Additions related to increases in previously recognized OTTI losses	0	246,000
Reductions due to increases in expected cash flows	0	0
End of period	4,116,000	3,476,000	4,116,000
Other Securities [Member]
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale, one year or less	0
Available-for-sale, after 1 through 5 years	7,554,000
Available-for-sale, after 5 through 10 years	1,901,000
Available-for-sale, after ten years	48,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, Fair Value	3,566,000		7,190,000
Less than 12 months, Unrealized Losses	(136,000)		(372,000)
12 months or longer, Fair Value	1,987,000		1,907,000
12 months or longer, Unrealized losses	(13,000)		(93,000)
Total Fair Value	5,553,000		9,096,000
Total Unrealized Losses	$ (149,000)		$ (465,000)