Investment Securities (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Summary of securities available for sale in an unrealized loss position
Fair Value, Less than 12 months	$ 96,154	$ 217,958
Unrealized Losses, Less than 12 months	452	733
Fair Value, 12 months or longer	59,647	62,795
Unrealized Losses, 12 months or longer	66,637	68,124
U.S. Treasury securities and obligations of U.S. Government corporations and agencies [Member]
Summary of securities available for sale in an unrealized loss position
Fair Value, Less than 12 months	81,084	196,988
Unrealized Losses, Less than 12 months	269	12
Fair Value, 12 months or longer	0	0
Unrealized Losses, 12 months or longer	0	0
State and political subdivisions [Member]
Summary of securities available for sale in an unrealized loss position
Fair Value, Less than 12 months	2,477	3,760
Unrealized Losses, Less than 12 months	2	25
Fair Value, 12 months or longer	0	968
Unrealized Losses, 12 months or longer	0	13
Residential mortgage-backed securities, Agency [Member]
Summary of securities available for sale in an unrealized loss position
Fair Value, Less than 12 months	11,136	14,789
Unrealized Losses, Less than 12 months	57	175
Fair Value, 12 months or longer	0	0
Unrealized Losses, 12 months or longer	0	0
Residential mortgage-backed securities, Non Agency [Member]
Summary of securities available for sale in an unrealized loss position
Fair Value, Less than 12 months	0	0
Unrealized Losses, Less than 12 months	0	0
Fair Value, 12 months or longer	11,844	12,369
Unrealized Losses, 12 months or longer	2,080	2,592
Trust preferred collateralized debt obligations [Member]
Summary of securities available for sale in an unrealized loss position
Fair Value, Less than 12 months	0	0
Unrealized Losses, Less than 12 months	0	0
Fair Value, 12 months or longer	40,784	42,369
Unrealized Losses, 12 months or longer	60,604	61,792
Single issue trust preferred securities [Member]
Summary of securities available for sale in an unrealized loss position
Fair Value, Less than 12 months	497	412
Unrealized Losses, Less than 12 months	3	88
Fair Value, 12 months or longer	6,730	6,956
Unrealized Losses, 12 months or longer	3,932	3,698
Marketable equity securities [Member]
Summary of securities available for sale in an unrealized loss position
Fair Value, Less than 12 months	960	2,009
Unrealized Losses, Less than 12 months	121	433
Fair Value, 12 months or longer	289	133
Unrealized Losses, 12 months or longer	$ 21	$ 29