Securities (Securities in a Continuous Unrealized Loss Position) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Number of securities in a continuous unrealized loss position for less than 12 months	2	5
Fair value of securities in a continuous unrealized loss position for less than 12 months	$ 4,966	$ 6,907
Unrealized losses of securities in a continuous unrealized loss position for less than 12 months	(33)	(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	24,366	23,283
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer	(10,348)	(11,612)
Number of securities in a continuous unrealized loss position total	15	18
Fair value of securities in a continuous unrealized loss position total	29,332	30,190
Unrealized losses of securities in a continuous unrealized loss position total	(10,381)	(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	23,436	22,396
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer	(7,231)	(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	23,436	22,396
Unrealized losses of securities in a continuous unrealized loss position total	(7,231)	(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	930	887
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer	(3,117)	(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	930	887
Unrealized losses of securities in a continuous unrealized loss position total	(3,117)	(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	2	3
Fair value of securities in a continuous unrealized loss position for less than 12 months	4,966	5,203
Unrealized losses of securities in a continuous unrealized loss position for less than 12 months	(33)	(403)
Number of securities in a continuous unrealized loss position for 12 months or longer	0	0
Fair value of securities in a continuous unrealized loss position for 12 months or longer	0	0
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer	0	0
Number of securities in a continuous unrealized loss position total	2	3
Fair value of securities in a continuous unrealized loss position total	4,966	5,203
Unrealized losses of securities in a continuous unrealized loss position total	(33)	(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	2	3
Fair value of securities in a continuous unrealized loss position for less than 12 months	4,966	5,203
Unrealized losses of securities in a continuous unrealized loss position for less than 12 months	(33)	(403)
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	24,366	23,283
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer	(10,348)	(11,612)
Number of securities in a continuous unrealized loss position total	15	16
Fair value of securities in a continuous unrealized loss position total	29,332	28,486
Unrealized losses of securities in a continuous unrealized loss position total	(10,381)	(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)