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Loans and allowance for credit losses (Details 3) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011 | Jun. 30, 2011
--- | --- | --- | ---
Loan Risk Rating | $ 809,958 | $ 841,050 | $ 877,331
Pass [Member] |  |  |
Loan Risk Rating | 623,607 | 643,258 |
Special Mention [Member] |  |  |
Loan Risk Rating | 67,142 | 63,686 |
Substandard [Member] |  |  |
Loan Risk Rating | 70,754 | 82,214 |
Doubtful [Member] |  |  |
Loan Risk Rating | 497 | 522 |
Non Accrual [Member] |  |  |
Loan Risk Rating | 47,958 | 51,370 |
Commercial Loan [Member] |  |  |
Loan Risk Rating | 63,004 | 69,485 | 74,485
Commercial Loan [Member] | Pass [Member] |  |  |
Loan Risk Rating | 56,049 | 59,178 |
Commercial Loan [Member] | Special Mention [Member] |  |  |
Loan Risk Rating | 3,669 | 3,813 |
Commercial Loan [Member] | Substandard [Member] |  |  |
Loan Risk Rating | 1,616 | 4,748 |
Commercial Loan [Member] | Doubtful [Member] |  |  |
Loan Risk Rating | 61 | 77 |
Commercial Loan [Member] | Non Accrual [Member] |  |  |
Loan Risk Rating | 1,609 | 1,669 |
Consumer Loan [Member] |  |  |
Loan Risk Rating | 14,150 | 14,639 | 15,265
Consumer Loan [Member] | Pass [Member] |  |  |
Loan Risk Rating | 13,846 | 14,520 |
Consumer Loan [Member] | Special Mention [Member] |  |  |
Loan Risk Rating | 185 | 32 |
Consumer Loan [Member] | Substandard [Member] |  |  |
Loan Risk Rating | 64 | 59 |
Consumer Loan [Member] | Doubtful [Member] |  |  |
Loan Risk Rating | 0 | 0 |
Consumer Loan [Member] | Non Accrual [Member] |  |  |
Loan Risk Rating | 55 | 28 |
Residential Real Estate [Member] |  |  |
Loan Risk Rating | 306,093 | 321,604 | 332,134
Residential Real Estate [Member] | Pass [Member] |  |  |
Loan Risk Rating | 249,611 | 261,910 |
Residential Real Estate [Member] | Special Mention [Member] |  |  |
Loan Risk Rating | 17,208 | 13,467 |
Residential Real Estate [Member] | Substandard [Member] |  |  |
Loan Risk Rating | 18,438 | 25,676 |
Residential Real Estate [Member] | Doubtful [Member] |  |  |
Loan Risk Rating | 436 | 445 |
Residential Real Estate [Member] | Non Accrual [Member] |  |  |
Loan Risk Rating | 20,400 | 20,106 |
Commercial Real Estate [Member] |  |  |
Loan Risk Rating | 315,644 | 315,439 | 327,307
Commercial Real Estate [Member] | Pass [Member] |  |  |
Loan Risk Rating | 257,072 | 257,247 |
Commercial Real Estate [Member] | Special Mention [Member] |  |  |
Loan Risk Rating | 19,447 | 16,001 |
Commercial Real Estate [Member] | Substandard [Member] |  |  |
Loan Risk Rating | 27,489 | 28,179 |
Commercial Real Estate [Member] | Doubtful [Member] |  |  |
Loan Risk Rating | 0 | 0 |
Commercial Real Estate [Member] | Non Accrual [Member] |  |  |
Loan Risk Rating | 11,636 | 14,012 |
Construction Loans [Member] |  |  |
Loan Risk Rating | 111,067 | 119,883 | 128,140
Construction Loans [Member] | Pass [Member] |  |  |
Loan Risk Rating | 47,029 | 50,403 |
Construction Loans [Member] | Special Mention [Member] |  |  |
Loan Risk Rating | 26,633 | 30,373 |
Construction Loans [Member] | Substandard [Member] |  |  |
Loan Risk Rating | 23,147 | 23,552 |
Construction Loans [Member] | Doubtful [Member] |  |  |
Loan Risk Rating | 0 | 0 |
Construction Loans [Member] | Non Accrual [Member] |  |  |
Loan Risk Rating | $ 14,258 | $ 15,555 |

X
- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -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. + Details
Name: | us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant