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Summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2011
Summary of significant accounting policies |
Schedule of earnings per share basic and diluted under two-class method |
|  | 2011 |  | 2010 |  | 2009 |
|  | Basic |  | Diluted |  | Basic |  | Diluted |  | Basic and diluted |
Distributed earnings |  | $ 1.24 |  | $ 1.24 |  | $ 1.24 |  |  | $ 1.24 |  |  | $ 1.24 |  |
Undistributed earnings (loss) |  | 0.21 |  | 0.20 |  | (0.02 | ) |  | (0.03 | ) |  | (0.33 | ) |
|  | $ 1.45 |  | $ 1.44 |  | $ 1.22 |  |  | $ 1.21 |  |  | $ 0.91 |  |
Schedule of amortized intangible assets |
Amortized intangible assets.
December 31 |  | 2011 |  | 2010 |
|  | Gross carrying |  | Accumulated |  | Valuation |  | Net carrying |  | Gross carrying |  | Accumulated |  | Valuation |  | Net carrying |
(in thousands) |  | amount |  | amortization |  | allowance |  | amount |  | amount |  | amortization |  | allowance |  | amount |
Mortgage servicing assets |  | $21,171 |  | (12,769) |  | (175) |  | $8,227 |  | $18,483 |  | (11,656) |  | (128) |  | $6,699 |
Schedule of changes in valuation allowance for mortgage servicing assets |
(in thousands) |  | 2011 |  | 2010 |  | 2009 |
Valuation allowance, January 1 |  | $128 |  | $201 |  | $268 |
Provision (recovery) |  | 121 |  | (12 | ) | 166 |
Other-than-temporary impairment |  | (74 | ) | (61 | ) | (233 | )
Valuation allowance, December 31 |  | $175 |  | $128 |  | $201 |

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- Definition Tabular disclosure of amortizable intangibles assets, in total and by major class, including the gross carrying amount and accumulated amortization. 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Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16265-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275 + Details
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- Definition Tabular disclosure of the activity by class in any valuation allowance for impairment of recognized servicing assets - including beginning and ending balances, aggregate additions charged and recoveries credited to operations, and aggregate write-downs charged against allowance. + 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(5) -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 (e) -URI http://asc.fasb.org/extlink&oid=6863725&loc=d3e122739-111746 + Details
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