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Summary of significant accounting policies (Details 4) (Mortgage servicing assets, Bank, USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Mortgage servicing assets | Bank |  |  |
Amortized intangible assets |  |  |
Gross carrying amount | $ 21,171,000 | $ 18,483,000 |
Accumulated amortization | (12,769,000) | (11,656,000) |
Valuation allowance | (175,000) | (128,000) | (201,000)
Net carrying value | 8,227,000 | 6,699,000 |
Changes in the valuation allowance for mortgage servicing assets |  |  |
Valuation allowance, balance at the beginning of the period | 128,000 | 201,000 | 268,000
Provision (recovery) | 121,000 | (12,000) | 166,000
Other-than-temporary impairment | (74,000) | (61,000) | (233,000)
Valuation allowance, balance at the end of the period | 175,000 | 128,000 | 201,000
Estimated aggregate amortization expenses |  |  |
2012 | 1,300,000 |  |
2013 | 1,100,000 |  |
2014 | 900,000 |  |
2015 | 800,000 |  |
2016 | 700,000 |  |
Assets acquired through the sale or securitization of loans held for sale | 2,800,000 | 3,300,000 | 3,300,000
Amortization Expenses | $ 1,100,000 | $ 900,000 | $ 800,000

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- Definition Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible assets having statutory or estimated useful lives. The aggregate gross carrying amount (including any previously recognized impairment charges) of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275 + Details
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- Definition The value of new servicing assets, subsequently measured at amortized value, acquired or created during the current period through purchases or from transfers of financial assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 17 -Subparagraph g(1)(b) -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 FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6863725&loc=d3e122739-111746 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4/FIN46(R)-8 -Paragraph B10 -Subparagraph a(2) -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
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