Investment Securities (Unrealized Gains) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Amortized cost	$ 462,700	$ 417,939
Investment Securities Available-for-Sale: Unrealized Gains	9,561	6,714
Investment Securities Available-for-Sale: Unrealized Losses	(5,071)	(10,146)
Investment Securities Available-for-Sale: Fair Value	467,190	414,507
Investment Securities Held-to-Maturity: Amortized Cost	62,997	72,233
Investment Securities Held-to-Maturity: Unrealized Gains	3,596	2,792
Investment Securities Held-to-Maturity: Unrealized Losses	(31)	(103)
Investment Securities Held-to-Maturity: Fair Value	66,562	74,922
Federal agency obligations [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Amortized cost	18,301	24,781
Investment Securities Available-for-Sale: Unrealized Gains	382	188
Investment Securities Available-for-Sale: Fair Value	18,683	24,969
Investment Securities Held-to-Maturity: Amortized Cost	17,532	28,262
Investment Securities Held-to-Maturity: Unrealized Gains	103	177
Investment Securities Held-to-Maturity: Unrealized Losses	(22)	(34)
Investment Securities Held-to-Maturity: Fair Value	17,613	28,405
Residential mortgage-backed securities [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Amortized cost	86,792	113,213
Investment Securities Available-for-Sale: Unrealized Gains	2,002	2,157
Investment Securities Available-for-Sale: Unrealized Losses		(6)
Investment Securities Available-for-Sale: Fair Value	88,794	115,364
Commercial mortgage-backed securities [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Amortized cost	9,742
Investment Securities Available-for-Sale: Unrealized Gains	74
Investment Securities Available-for-Sale: Unrealized Losses	(17)
Investment Securities Available-for-Sale: Fair Value	9,799
Investment Securities Held-to-Maturity: Amortized Cost	6,182	6,276
Investment Securities Held-to-Maturity: Unrealized Gains	93
Investment Securities Held-to-Maturity: Unrealized Losses	(8)	(69)
Investment Securities Held-to-Maturity: Fair Value	6,267	6,207
Obligations of U.S. states and political subdivisions [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Amortized cost	81,898	66,309
Investment Securities Available-for-Sale: Unrealized Gains	3,449	2,900
Investment Securities Available-for-Sale: Unrealized Losses	(203)	(36)
Investment Securities Available-for-Sale: Fair Value	85,144	69,173
Investment Securities Held-to-Maturity: Amortized Cost	39,283	37,695
Investment Securities Held-to-Maturity: Unrealized Gains	3,400	2,615
Investment Securities Held-to-Maturity: Unrealized Losses	(1)
Investment Securities Held-to-Maturity: Fair Value	42,682	40,310
Trust preferred securities [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Amortized cost	20,610	20,567
Investment Securities Available-for-Sale: Unrealized Gains	42	14
Investment Securities Available-for-Sale: Unrealized Losses	(1,827)	(4,394)
Investment Securities Available-for-Sale: Fair Value	18,825	16,187
Corporate bonds and notes [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Amortized cost	210,859	175,812
Investment Securities Available-for-Sale: Unrealized Gains	3,432	1,382
Investment Securities Available-for-Sale: Unrealized Losses	(1,587)	(4,077)
Investment Securities Available-for-Sale: Fair Value	212,704	173,117
Collateralized mortgage obligations [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Amortized cost	2,854	3,226
Investment Securities Available-for-Sale: Unrealized Losses	(1,102)	(1,327)
Investment Securities Available-for-Sale: Fair Value	1,752	1,899
Asset-backed securities [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Amortized cost	19,643	7,614
Investment Securities Available-for-Sale: Unrealized Gains	117	52
Investment Securities Available-for-Sale: Unrealized Losses	(127)	(13)
Investment Securities Available-for-Sale: Fair Value	19,633	7,653
Equity securities [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Amortized cost	772	535
Investment Securities Available-for-Sale: Unrealized Gains	16	21
Investment Securities Available-for-Sale: Unrealized Losses	(187)	(273)
Investment Securities Available-for-Sale: Fair Value	601	262
Other securities [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Amortized cost	11,229	5,882
Investment Securities Available-for-Sale: Unrealized Gains	47	21
Investment Securities Available-for-Sale: Unrealized Losses	(21)	(20)
Investment Securities Available-for-Sale: Fair Value	$ 11,255	$ 5,883

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

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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-Publisher FASB

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Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

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Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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+ Details

- 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+ Details

- Definition

This item represents the aggregate fair value of investments in debt securities as of the balance sheet date and which are categorized as held-to-maturity.

+ References+ Details

- Definition

As of the balance sheet date, the excess of fair value over carrying value (amortized cost) of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding gain.

+ References+ Details

- Definition

As of the balance sheet date, the excess of carrying value (amortized cost) over fair value of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding loss.

+ References+ Details