Loans Receivable and Allowance for Loan Losses (Average Of Impaired Loans And Related Interest Income By Loan Portfolio Class) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Loans with no related allowance recorded: Average Recorded Investment	$ 27,132	$ 51,500	$ 26,120	$ 53,970
Impaired Loans with an allowance recorded: Average Recorded Investment	15,903	22,258	14,635	24,840
Total Average Recorded Investment	43,035	73,758	40,755	78,810
Impaired Loans with no related allowance recorded: Interest Income Recognized	248	312	786	1,074
Impaired Loans with an allowance recorded: Interest Income Recognized	188	200	390	548
Total Interest Income Recognized	436	512	1,176	1,622
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	225	503	545	1,600
Commercial real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Loans with no related allowance recorded: Average Recorded Investment	15,728	28,726	14,786	31,140
Impaired Loans with an allowance recorded: Average Recorded Investment	9,256	13,951	7,488	12,901
Total Average Recorded Investment	24,984	42,677	22,274	44,041
Impaired Loans with no related allowance recorded: Interest Income Recognized	186	231	556	822
Impaired Loans with an allowance recorded: Interest Income Recognized	124	159	259	411
Total Interest Income Recognized	310	390	815	1,233
Construction and land development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Loans with no related allowance recorded: Average Recorded Investment	4,878	18,286	4,946	17,328
Impaired Loans with an allowance recorded: Average Recorded Investment	923	2,285	1,305	5,545
Total Average Recorded Investment	5,801	20,571	6,251	22,873
Impaired Loans with no related allowance recorded: Interest Income Recognized	27	46	86	144
Impaired Loans with an allowance recorded: Interest Income Recognized		4		25
Total Interest Income Recognized	27	49	86	169
Commercial and industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Loans with no related allowance recorded: Average Recorded Investment	4,955	2,313	4,509	3,083
Impaired Loans with an allowance recorded: Average Recorded Investment	2,480	3,956	3,454	3,784
Total Average Recorded Investment	7,435	6,269	7,963	6,867
Impaired Loans with no related allowance recorded: Interest Income Recognized	28	27	106	80
Impaired Loans with an allowance recorded: Interest Income Recognized	16	5	35	16
Total Interest Income Recognized	44	32	141	96
Owner occupied real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Loans with no related allowance recorded: Average Recorded Investment	673	1,436	1,013	1,710
Impaired Loans with an allowance recorded: Average Recorded Investment	3,123	2,066	2,315	2,610
Total Average Recorded Investment	3,796	3,502	3,328	4,320
Impaired Loans with no related allowance recorded: Interest Income Recognized	3	9	30	28
Impaired Loans with an allowance recorded: Interest Income Recognized	48	32	96	96
Total Interest Income Recognized	51	41	126	124
Consumer and other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Loans with no related allowance recorded: Average Recorded Investment	898	739	866	709
Impaired Loans with an allowance recorded: Average Recorded Investment	121		73
Total Average Recorded Investment	1,019	739	939	709
Impaired Loans with no related allowance recorded: Interest Income Recognized	4		8
Total Interest Income Recognized	$ 4		$ 8

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5258-111524

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- Definition

Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

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- Definition

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- Definition

Amount of interest income, recognized on cash basis, on financing receivables, for which there is no related allowance for credit losses and are recognized as impaired.

+ References

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Amount of average investment of impaired financing receivables for which there is a related allowance for credit losses.

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- Definition

Amount of interest income on financing receivables, for which there is a related allowance for credit losses, recognized on a cash-basis method of accounting that the financing receivables were impaired.

+ References

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- Definition

Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 114

-Paragraph 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Section 563c.102

-Paragraph 8

-Subparagraph j(ii)

-Chapter V

-Subsection I

-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 15

-Paragraph 40

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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