Investment Securities (Schedule Of Amortized Cost And Estimated Fair Values Of Investment Securities - Available-for-Sale) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Fair value	$ 425,215	$ 348,091
Gross unrealized holding gains	10,458	8,908
Gross unrealized holding losses	1,981	1,840
Amortized cost	416,738	341,023
U.S. Government agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value	105,283	68,493
Gross unrealized holding gains	824	635
Gross unrealized holding losses	10	5
Amortized cost	104,469	67,863
State and municipal securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value	87,324	78,786
Gross unrealized holding gains	3,330	2,861
Gross unrealized holding losses	44	6
Amortized cost	84,038	75,931
Mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value	126,570	113,243
Gross unrealized holding gains	4,252	3,169
Gross unrealized holding losses	1	16
Amortized cost	122,319	110,090
Collateralized mortgage obligations (CMOs) [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value	97,401	79,345
Gross unrealized holding gains	1,400	1,577
Gross unrealized holding losses	209	27
Amortized cost	96,210	77,795
Pooled trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value	1,961	1,929
Gross unrealized holding gains	37	12
Gross unrealized holding losses	1,595	1,723
Amortized cost	3,519	3,640
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value	2,525	2,495
Gross unrealized holding gains	68	44
Gross unrealized holding losses		4
Amortized cost	2,457	2,455
Equity securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value	4,151	3,800
Gross unrealized holding gains	547	610
Gross unrealized holding losses	122	59
Amortized cost	$ 3,726	$ 3,249

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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-Name Accounting Standards Codification

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

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-Publisher FASB

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-Number 115

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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

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-Name Statement of Financial Accounting Standard (FAS)

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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 gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

+ References+ Details