Investment Securities, Part II (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended													12 Months Ended				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 U.S. Treasury securities and obligations of U.S. government corporations & agencies	Dec. 31, 2011 U.S. Treasury securities and obligations of U.S. government corporations & agencies	Dec. 31, 2012 Obligations of states and political subdivisions	Dec. 31, 2011 Obligations of states and political subdivisions	Dec. 31, 2012 Mortgage-backed securities: GSE residential	Dec. 31, 2011 Mortgage-backed securities: GSE residential	Dec. 31, 2012 Trust preferred securities securities	Dec. 31, 2011 Trust preferred securities securities	Dec. 31, 2012 Other securities	Dec. 31, 2011 Other securities securities	Dec. 31, 2012 PreTSL I	Dec. 31, 2012 PreTSL II	Dec. 31, 2012 PreTSL VI [Member]	Jul. 03, 2012 PreTSL VI [Member]	Dec. 31, 2012 PreTSL XXVIII
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 98,706
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	119,277
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	23,836
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	6,733
AFS Securities, Debt Maturities, Single Maturity Date, Next Twelve Months, Fair Value	99,137
AFS Securities, Debt Maturities, Single Maturity Date, Year Two Through Five, Fair Value	121,655
AFS Securities, Debt Maturities, Single Maturity Date, Year Six Through Ten, Fair Value	25,661
AFS Securities, Debt Maturities, Single Maturity Date, After Ten Years, Fair Value	2,396
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	248,552
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	252,310
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	500,862
Available-for-sale Securities, Debt Maturities [Abstract]
One year or less	107,571			98,367		770		8,434		0		0
After 1 through 5 years	340,239			82,093		29,734		218,584		0		9,828
After 5 through 10 years	58,103			1,709		23,952		32,442		0		0
After ten years	2,396			0		1,751		0		585		60
Available-for-sale Securities, Debt Maturities, Single Maturity Date	248,849
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	259,460
Fair Value	508,309	478,916		182,169	166,066	56,207	41,202	259,460	261,833	585	719	9,888	9,096
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale, Weighted Average Yield, Maturities Year One (in hundredths)	1.93%
Available-for-sale , Weighted Average Yield, Maturities After 1 through 5 Years (in hundredths)	2.52%
Available-for-sale, Weighted Average Yield, Maturities After 5 through 10 Years (in hundredths)	2.77%
Available-for-sale , Weighted Average Yield, Maturities After 10 Years (in hundredths)	3.28%
Available-for-sale , Weighted Average Yield, Maturities (in hundredths)	2.45%
Available-for-sale, Full Tax-equivalent Yield, Maturities Year One (in hundredths)	1.95%
Available-for-sale, Full Tax-equivalent Yield, Maturities After 1 through 5 Years (in hundredths)	2.76%
Available-for-sale, Full Tax-equivalent Yield, Maturities After 5 through 10 years (in hundredths)	3.85%
Available-for-sale, Full Tax-equivalent Yield, Maturities After Ten Years (in hundredths)	3.81%
Available-for-sale, Full Tax-equivalent Yield, Maturities (in hundredths)	2.74%
Tax rate used to calculate tax-equivalent yields (in hundredths)	35.00%
Percentage investment book value exceeds total stockholders' equity (in hundredths)	10.00%
Investment Securities Pledged as Collateral	267,321	286,568
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, Fair Value	13,663	43,071		10,997	19,960	1,969	690	697	15,231	0	0	0	7,190
Less than 12 months, Unrealized Losses	(35)	(449)		(3)	(40)	(20)	0	(12)	(37)	0	0	0	(372)
12 months or longer, Fair Value	585	2,626		0	0	0	0	0	0	585	719	0	1,907
12 months or longer, Unrealized losses	4,389	4,999		0	0	0	0	0	0	4,389	4,906	0	93
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	14,248	45,696		10,997	19,960	1,969	690	697	15,231	585	719	0	9,096
Total Unrealized Losses	(4,424)	(5,448)		(3)	(40)	(20)	0	(12)	(37)	(4,389)	(4,906)	0	(465)
Number of securities in Unrealized Loss Positions										3	4		1
Trust Preferred Securities [Abstract]
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Total		886
Details of Trust Preferred Securities [Abstract]
Book Value	4,974													513	809		123	3,652
Market Value	585													297	219			69
Unrealized Gains (Losses)	(4,389)													(216)	(590)			(3,583)
Other-than- temporary Impairment Recorded To-date	(3,989)													(691)	(2,187)	127		(1,111)
Interest Paid																12
Credit losses on trust preferred securities held [Abstract]
Beginning of period	4,116	3,230	1,812
Additions related to OTTI losses not previously recognized	0	0	0
Reductions due to sales / (recoveries)	(127)	0	0
Reductions due to change in intent or likelihood of sale	0	0	0
Additions related to increases in previously recognized OTTI losses	0	886	1,418
Reductions due to increases in expected cash flows	0	0	0
End of period	$ 3,989	$ 4,116	$ 3,230