Investment Securities (Available-for-sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 623,024	$ 628,584
Gross unrealized gains	11,257	21,260
Gross unrealized losses	(18,245)	(10,659)
Available-for-sale securities, total fair value	616,036	639,185
U.S. Treasury and government agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	22	26
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Available-for-sale securities, total fair value	22	26
U.S. government sponsored agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	341	486
Gross unrealized gains	15	30
Gross unrealized losses	0	0
Available-for-sale securities, total fair value	356	516
States and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	50,495	42,458
Gross unrealized gains	1,700	3,292
Gross unrealized losses	(1,134)	(82)
Available-for-sale securities, total fair value	51,061	45,668
Residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	528,634	511,305
Gross unrealized gains	6,176	12,558
Gross unrealized losses	(15,423)	(9,767)
Available-for-sale securities, total fair value	519,387	514,096
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	33,813	62,129
Gross unrealized gains	289	2,330
Gross unrealized losses	(967)	(43)
Available-for-sale securities, total fair value	33,135	64,416
Bank-issued trust preferred securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	8,503	10,966
Gross unrealized gains	0	73
Gross unrealized losses	(635)	(682)
Available-for-sale securities, total fair value	7,868	10,357
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	1,216	1,214
Gross unrealized gains	3,077	2,977
Gross unrealized losses	(86)	(85)
Available-for-sale securities, total fair value	$ 4,207	$ 4,106

Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized loss on investments in available-for-sale debt securities impacting investments.

No definition available.

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- Definition

Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale debt securities impacting investments.

+ References

No definition available.

+ Details

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

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- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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