Bank subsidiary (Details 7) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Credit risk profile based on payment activity for loans
30-59 days past due	$ 10,605	$ 12,412
60-89 days past due	4,023	6,895
Greater than 90 days	50,702	57,946
Total past due	65,330	77,253
Current	3,609,410	3,468,803
Total financing receivables	3,674,740	3,546,056
Recorded Investment greater than 90 days and accruing	445	965
Residential 1-4 family
Credit risk profile based on payment activity for loans
30-59 days past due	7,933	8,245
60-89 days past due	1,756	3,719
Greater than 90 days	33,008	36,419
Total past due	42,697	48,383
Current	1,954,788	2,039,430
Total financing receivables	1,997,485	2,087,813
Commercial real estate
Credit risk profile based on payment activity for loans
60-89 days past due		4
Total past due		4
Current	320,874	300,685
Total financing receivables	320,874	300,689
Home equity line of credit
Credit risk profile based on payment activity for loans
30-59 days past due	1,129	1,103
60-89 days past due	510	227
Greater than 90 days	1,560	1,659
Total past due	3,199	2,989
Current	500,006	413,464
Total financing receivables	503,205	416,453
Residential land
Credit risk profile based on payment activity for loans
30-59 days past due	720	1,543
60-89 days past due	458	1,218
Greater than 90 days	13,468	16,060
Total past due	14,646	18,821
Current	32,925	46,778
Total financing receivables	47,571	65,599
Recorded Investment greater than 90 days and accruing		581
Commercial construction
Credit risk profile based on payment activity for loans
Current	42,194	38,079
Total financing receivables	42,194	38,079
Residential construction
Credit risk profile based on payment activity for loans
Current	3,191	5,602
Total financing receivables	3,191	5,602
Commercial loans
Credit risk profile based on payment activity for loans
30-59 days past due	325	892
60-89 days past due	961	1,317
Greater than 90 days	2,171	3,191
Total past due	3,457	5,400
Current	673,183	546,283
Total financing receivables	676,640	551,683
Recorded Investment greater than 90 days and accruing	109	64
Consumer loans
Credit risk profile based on payment activity for loans
30-59 days past due	498	629
60-89 days past due	338	410
Greater than 90 days	495	617
Total past due	1,331	1,656
Current	82,249	78,482
Total financing receivables	83,580	80,138
Recorded Investment greater than 90 days and accruing	$ 336	$ 320

The amount of the recorded investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, accounts receivable (with terms exceeding one year), notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Receivable

-URI http://asc.fasb.org/extlink&oid=6953735

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing receivables that are less than 60 days past due but more than 29 days past due.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7A

-URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953401-111524

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing receivables that are less than 90 days past due but more than 59 days past due.

+ References

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5111-111524

-Subparagraph (d)

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- Definition

Financing receivables that are current.

+ References

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing receivables that are equal to or greater than 90 days past due.

+ References

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
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- Definition

Recorded Investment in financing receivables that are past due at the balance sheet date.

+ References

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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