Securities (Securities in a Continuous Unrealized Loss Position) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012 security	Dec. 31, 2011 security
Schedule of Available-for-sale Securities [Line Items]
Number of securities in a continuous unrealized loss position for less than 12 months	0	5
Fair value of securities in a continuous unrealized loss position for less than 12 months	$ 0	$ 6,907
Unrealized losses of securities in a continuous unrealized loss position for less than 12 months	0	(553)
Number of securities in a continuous unrealized loss position for 12 months or longer	13	13
Fair value of securities in a continuous unrealized loss position for 12 months or longer	25,594	23,283
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer	(9,119)	(11,612)
Number of securities in a continuous unrealized loss position total	13	18
Fair value of securities in a continuous unrealized loss position total	25,594	30,190
Unrealized losses of securities in a continuous unrealized loss position total	(9,119)	(12,165)
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	24,751	22,396
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer	(5,926)	(8,243)
Number of securities in a continuous unrealized loss position total	11	11
Fair value of securities in a continuous unrealized loss position total	24,751	22,396
Unrealized losses of securities in a continuous unrealized loss position total	(5,926)	(8,243)
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	2	2
Fair value of securities in a continuous unrealized loss position for 12 months or longer	843	887
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer	(3,193)	(3,369)
Number of securities in a continuous unrealized loss position total	2	2
Fair value of securities in a continuous unrealized loss position total	843	887
Unrealized losses of securities in a continuous unrealized loss position total	(3,193)	(3,369)
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of securities in a continuous unrealized loss position for less than 12 months		3
Fair value of securities in a continuous unrealized loss position for less than 12 months		5,203
Unrealized losses of securities in a continuous unrealized loss position for less than 12 months		(403)
Number of securities in a continuous unrealized loss position for 12 months or longer		0
Fair value of securities in a continuous unrealized loss position for 12 months or longer		0
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer		0
Number of securities in a continuous unrealized loss position total		3
Fair value of securities in a continuous unrealized loss position total		5,203
Unrealized losses of securities in a continuous unrealized loss position total		(403)
Debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of securities in a continuous unrealized loss position for less than 12 months		3
Fair value of securities in a continuous unrealized loss position for less than 12 months		5,203
Unrealized losses of securities in a continuous unrealized loss position for less than 12 months		(403)
Number of securities in a continuous unrealized loss position for 12 months or longer		13
Fair value of securities in a continuous unrealized loss position for 12 months or longer		23,283
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer		(11,612)
Number of securities in a continuous unrealized loss position total		16
Fair value of securities in a continuous unrealized loss position total		28,486
Unrealized losses of securities in a continuous unrealized loss position total		(12,015)
Perpetual preferred stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of securities in a continuous unrealized loss position for less than 12 months		2
Fair value of securities in a continuous unrealized loss position for less than 12 months		1,704
Unrealized losses of securities in a continuous unrealized loss position for less than 12 months		(150)
Number of securities in a continuous unrealized loss position for 12 months or longer		0
Fair value of securities in a continuous unrealized loss position for 12 months or longer		0
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer		0
Number of securities in a continuous unrealized loss position total		2
Fair value of securities in a continuous unrealized loss position total		1,704
Unrealized losses of securities in a continuous unrealized loss position total		$ (150)