Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended									6 Months Ended	12 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Jun. 30, 2012 U.S. Treasury Securities and Obligations of U.S. Government Corporations & Agencies [Member]	Dec. 31, 2011 U.S. Treasury Securities and Obligations of U.S. Government Corporations & Agencies [Member]	Jun. 30, 2012 Obligations of States and Political Subdivisions [Member]	Dec. 31, 2011 Obligations of States and Political Subdivisions [Member]	Jun. 30, 2012 Mortgage-backed Securities: GSE Residential [Member]	Dec. 31, 2011 Mortgage-backed Securities: GSE Residential [Member]	Jun. 30, 2012 Trust Preferred Securities [Member]	Dec. 31, 2011 Trust Preferred Securities [Member]	Jun. 30, 2012 Trust Preferred Securities [Member] Minimum [Member]	Jun. 30, 2012 Trust Preferred Securities [Member] Maximum [Member]	Dec. 31, 2011 Trust Preferred Securities [Member] Maximum [Member]	Jun. 30, 2012 Other Securities [Member]	Dec. 31, 2011 Other Securities [Member]
Available-for-sale: [Abstract]
Amortized Cost-AFS				$ 150,936	$ 164,812	$ 46,176	$ 38,828	$ 291,720	$ 254,930				$ 5,372	$ 5,625	$ 9,612	$ 9,561
Gross Unrealized Gains	11,260		10,608	1,166	1,294	2,841	2,374	7,206	6,940	7	0				40	0
Gross Unrealized Losses	5,049		5,448	52	40	26	0	91	37	4,731	4,906				149	465
Fair Value	510,027		478,916	152,050	166,066	48,991	41,202	298,835	261,833	648	719				9,503	9,096
Held-to-maturity Securities [Abstract]
Amortized Cost	51		51
Unrealized Gains	0		0
Unrealized Losses	0		0
Fair Value	51		51
Number of trust preferred securities	4									3	4
Maturities of Debt Securities												18 years	26 years
Realized Investment Gains (Losses) [Abstract]
Gross gains	823	377
Gross losses	$ 0	$ 0