Investment Securities (Schedule of Unrealized Losses Not Recognized in Income) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Less than 12 months, fair value	$ 130,084	$ 54,492
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses	(4,466)	(323)
Investment Securities Available-for-Sale: 12 Months or Longer, fair value	4,539	10,752
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses	(1,267)	(1,618)
Investment Securities Available-for-Sale: Total, fair value	134,623	65,244
Investment Securities Available-for-Sale: Total, unrealized losses	(5,733)	(1,941)
Investment Securities Held-to-Maturity: Less than 12 months, fair value	81,419	932
Investment Securities Held-to-Maturity: 12 months or less, unrealized losses	(3,539)	(5)
Investment Securities Held-to-Maturity: 12 months or longer, fair value	468	0
Investment Securities Held-to-Maturity: 12 months or longer, unrealized losses	(6)	0
Investment Securities Held-to-Maturity: Total, fair value	81,887	932
Investment Securities Held-to-Maturity: Total, unrealized losses	(3,545)	(5)
Temporarily Impaired Securities, Total Fair Value	216,510	66,176
Temporarily Impaired Securities, Total Unrealized Losses	(9,278)	(1,946)
Temporarily Impaired Securities, Less than 12 Months, Fair Value	211,503	55,424
Temporarily Impaired Securities, Less than 12 Months, unrealized losses	(8,005)	(328)
Temporarily Impaired Securities, 12 months or longer, Fair Value	5,007	10,752
Temporarily Impaired Securities, 12 months or longer, Aggregate losses	(1,273)	(1,618)
U.S. treasury notes [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Less than 12 months, fair value	42,138	4,460
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses	(1,312)	(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	42,138	4,460
Investment Securities Available-for-Sale: Total, unrealized losses	(1,312)	(23)
Federal agency obligations [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Less than 12 months, fair value	9,709	877
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses	(437)	(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	9,709	877
Investment Securities Available-for-Sale: Total, unrealized losses	(437)	(5)
Commercial mortgage-backed securities [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Less than 12 months, fair value	9,421
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses	(288)
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	9,421
Investment Securities Available-for-Sale: Total, unrealized losses	(288)
Investment Securities Held-to-Maturity: Less than 12 months, fair value	4,399	932
Investment Securities Held-to-Maturity: 12 months or less, unrealized losses	(92)	(5)
Investment Securities Held-to-Maturity: 12 months or longer, fair value	468	0
Investment Securities Held-to-Maturity: 12 months or longer, unrealized losses	(6)	0
Investment Securities Held-to-Maturity: Total, fair value	4,867	932
Investment Securities Held-to-Maturity: Total, unrealized losses	(98)	(5)
Residential mortgage-backed securities [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Less than 12 months, fair value	10,045	1,669
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses	(221)	(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	10,045	1,669
Investment Securities Available-for-Sale: Total, unrealized losses	(221)	(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	2,226	18,360
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses	(25)	(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	2,226	18,360
Investment Securities Available-for-Sale: Total, unrealized losses	(25)	(132)
Investment Securities Held-to-Maturity: Less than 12 months, fair value	67,011
Investment Securities Held-to-Maturity: 12 months or less, unrealized losses	(3,365)
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	67,011
Investment Securities Held-to-Maturity: Total, unrealized losses	(3,365)
Trust preferred securities [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Less than 12 months, fair value	5,184	10,494
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses	(58)	(18)
Investment Securities Available-for-Sale: 12 Months or Longer, fair value	1,333	1,246
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses	(1,099)	(1,156)
Investment Securities Available-for-Sale: Total, fair value	6,517	11,740
Investment Securities Available-for-Sale: Total, unrealized losses	(1,157)	(1,174)
Corporate bonds and notes [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Less than 12 months, fair value	50,554	18,244
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses	(2,096)	(134)
Investment Securities Available-for-Sale: 12 Months or Longer, fair value	1,966	8,196
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses	(32)	(237)
Investment Securities Available-for-Sale: Total, fair value	52,520	26,440
Investment Securities Available-for-Sale: Total, unrealized losses	(2,128)	(371)
Investment Securities Held-to-Maturity: Less than 12 months, fair value	10,009
Investment Securities Held-to-Maturity: 12 months or less, unrealized losses	(82)
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	10,009
Investment Securities Held-to-Maturity: Total, unrealized losses	(82)
Certificates of Deposit [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Less than 12 months, fair value	807	388
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses	(29)	(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	807	388
Investment Securities Available-for-Sale: Total, unrealized losses	(29)	(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	255	325
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses	(121)	(210)
Investment Securities Available-for-Sale: Total, fair value	255	325
Investment Securities Available-for-Sale: Total, unrealized losses	(121)	(210)
Other 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	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)