Securities (Securities in a Continuous Unrealized Loss Position) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013 security	Dec. 31, 2012 security
Schedule of Available-for-sale Securities [Line Items]
Number of securities in a continuous unrealized loss position for less than 12 months	0	0
Fair value of securities in a continuous unrealized loss position for less than 12 months	$ 0	$ 0
Unrealized losses of securities in a continuous unrealized loss position for less than 12 months	0	0
Number of securities in a continuous unrealized loss position for 12 months or longer	12	13
Fair value of securities in a continuous unrealized loss position for 12 months or longer	25,978	25,594
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer	(5,972)	(9,119)
Number of securities in a continuous unrealized loss position total	12	13
Fair value of securities in a continuous unrealized loss position total	25,978	25,594
Unrealized losses of securities in a continuous unrealized loss position total	(5,972)	(9,119)
Trust preferred securities: Individual name issuers [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of securities in a continuous unrealized loss position for less than 12 months	0	0
Fair value of securities in a continuous unrealized loss position for less than 12 months	0	0
Unrealized losses of securities in a continuous unrealized loss position for less than 12 months	0	0
Number of securities in a continuous unrealized loss position for 12 months or longer	11	11
Fair value of securities in a continuous unrealized loss position for 12 months or longer	25,574	24,751
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer	(5,112)	(5,926)
Number of securities in a continuous unrealized loss position total	11	11
Fair value of securities in a continuous unrealized loss position total	25,574	24,751
Unrealized losses of securities in a continuous unrealized loss position total	(5,112)	(5,926)
Trust preferred securities: Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of securities in a continuous unrealized loss position for less than 12 months	0	0
Fair value of securities in a continuous unrealized loss position for less than 12 months	0	0
Unrealized losses of securities in a continuous unrealized loss position for less than 12 months	0	0
Number of securities in a continuous unrealized loss position for 12 months or longer	1	2
Fair value of securities in a continuous unrealized loss position for 12 months or longer	404	843
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer	(860)	(3,193)
Number of securities in a continuous unrealized loss position total	1	2
Fair value of securities in a continuous unrealized loss position total	404	843
Unrealized losses of securities in a continuous unrealized loss position total	$ (860)	$ (3,193)