Investment Securities (Schedule of Unrealized Losses Not Recognized in Income) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Less than 12 months, fair value	$ 124,567	$ 54,492
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses	(4,679)	(323)
Investment Securities Available-for-Sale: 12 Months or Longer, fair value	4,607	10,752
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses	(1,215)	(1,618)
Investment Securities Available-for-Sale: Total, fair value	129,174	65,244
Investment Securities Available-for-Sale: Total, unrealized losses	(5,894)	(1,941)
Investment Securities Held-to-Maturity: Less than 12 months, fair value	69,994	932
Investment Securities Held-to-Maturity: 12 months or less, unrealized losses	(3,626)	(5)
Investment Securities Held-to-Maturity: 12 months or longer, fair value	334	0
Investment Securities Held-to-Maturity: 12 months or longer, unrealized losses	(2)	0
Investment Securities Held-to-Maturity: Total, fair value	70,328	932
Investment Securities Held-to-Maturity: Total, unrealized losses	(3,628)	(5)
Temporarily Impaired Securities, Total Fair Value	199,502	66,176
Temporarily Impaired Securities, Total Unrealized Losses	(9,522)	(1,946)
Temporarily Impaired Securities, Less than 12 Months, Fair Value	194,561	55,424
Temporarily Impaired Securities, Less than 12 Months, unrealized losses	(8,305)	(328)
Temporarily Impaired Securities, 12 months or longer, Fair Value	4,941	10,752
Temporarily Impaired Securities, 12 months or longer, Aggregate losses	(1,217)	(1,618)
U.S. treasury notes [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Less than 12 months, fair value	41,695	4,460
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses	(1,795)	(23)
Investment Securities Available-for-Sale: 12 Months or Longer, fair value	0	0
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses	0	0
Investment Securities Available-for-Sale: Total, fair value	41,695	4,460
Investment Securities Available-for-Sale: Total, unrealized losses	(1,795)	(23)
Federal agency obligations [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Less than 12 months, fair value	13,391	877
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses	(303)	(5)
Investment Securities Available-for-Sale: 12 Months or Longer, fair value	0	0
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses	0	0
Investment Securities Available-for-Sale: Total, fair value	13,391	877
Investment Securities Available-for-Sale: Total, unrealized losses	(303)	(5)
Commercial mortgage-backed securities [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Less than 12 months, fair value	9,519
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses	(182)
Investment Securities Available-for-Sale: 12 Months or Longer, fair value	0
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses	0
Investment Securities Available-for-Sale: Total, fair value	9,519
Investment Securities Available-for-Sale: Total, unrealized losses	(182)
Investment Securities Held-to-Maturity: Less than 12 months, fair value	1,428	932
Investment Securities Held-to-Maturity: 12 months or less, unrealized losses	(44)	(5)
Investment Securities Held-to-Maturity: 12 months or longer, fair value	334	0
Investment Securities Held-to-Maturity: 12 months or longer, unrealized losses	(2)	0
Investment Securities Held-to-Maturity: Total, fair value	1,762	932
Investment Securities Held-to-Maturity: Total, unrealized losses	(46)	(5)
Residential mortgage-backed securities [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Less than 12 months, fair value	7,695	1,669
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses	(150)	(1)
Investment Securities Available-for-Sale: 12 Months or Longer, fair value	0	0
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses	0	0
Investment Securities Available-for-Sale: Total, fair value	7,695	1,669
Investment Securities Available-for-Sale: Total, unrealized losses	(150)	(1)
Obligations of U.S. states and political subdivisions [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Less than 12 months, fair value	2,209	18,360
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses	(37)	(132)
Investment Securities Available-for-Sale: 12 Months or Longer, fair value	0	0
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses	0	0
Investment Securities Available-for-Sale: Total, fair value	2,209	18,360
Investment Securities Available-for-Sale: Total, unrealized losses	(37)	(132)
Investment Securities Held-to-Maturity: Less than 12 months, fair value	63,559
Investment Securities Held-to-Maturity: 12 months or less, unrealized losses	(3,561)
Investment Securities Held-to-Maturity: 12 months or longer, fair value	0
Investment Securities Held-to-Maturity: 12 months or longer, unrealized losses	0
Investment Securities Held-to-Maturity: Total, fair value	63,559
Investment Securities Held-to-Maturity: Total, unrealized losses	(3,561)
Trust preferred securities [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Less than 12 months, fair value	7,401	10,494
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses	(147)	(18)
Investment Securities Available-for-Sale: 12 Months or Longer, fair value	1,371	1,246
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses	(1,076)	(1,156)
Investment Securities Available-for-Sale: Total, fair value	8,772	11,740
Investment Securities Available-for-Sale: Total, unrealized losses	(1,223)	(1,174)
Corporate bonds and notes [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Less than 12 months, fair value	42,463	18,244
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses	(2,064)	(134)
Investment Securities Available-for-Sale: 12 Months or Longer, fair value	1,964	8,196
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses	(35)	(237)
Investment Securities Available-for-Sale: Total, fair value	44,427	26,440
Investment Securities Available-for-Sale: Total, unrealized losses	(2,099)	(371)
Investment Securities Held-to-Maturity: Less than 12 months, fair value	5,007
Investment Securities Held-to-Maturity: 12 months or less, unrealized losses	(21)
Investment Securities Held-to-Maturity: 12 months or longer, fair value	0
Investment Securities Held-to-Maturity: 12 months or longer, unrealized losses	0
Investment Securities Held-to-Maturity: Total, fair value	5,007
Investment Securities Held-to-Maturity: Total, unrealized losses	(21)
Certificates of Deposit [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Less than 12 months, fair value	194	388
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses	(1)	(10)
Investment Securities Available-for-Sale: 12 Months or Longer, fair value	0	0
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses	0	0
Investment Securities Available-for-Sale: Total, fair value	194	388
Investment Securities Available-for-Sale: Total, unrealized losses	(1)	(10)
Equity securities [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Less than 12 months, fair value	0	0
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses	0	0
Investment Securities Available-for-Sale: 12 Months or Longer, fair value	287	325
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses	(89)	(210)
Investment Securities Available-for-Sale: Total, fair value	287	325
Investment Securities Available-for-Sale: Total, unrealized losses	(89)	(210)
Mutual funds and money market funds [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Less than 12 months, fair value	0	0
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses	0	0
Investment Securities Available-for-Sale: 12 Months or Longer, fair value	985	985
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses	(15)	(15)
Investment Securities Available-for-Sale: Total, fair value	985	985
Investment Securities Available-for-Sale: Total, unrealized losses	$ (15)	$ (15)