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Loan Servicing (Tables) | 12 Months Ended
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Dec. 31, 2012
Transfers and Servicing of Financial Assets [Abstract] |
Schedule of servicing assets at amortized value | Activity for mortgage servicing rights and the related valuation allowance follows:
December 31 (In thousands) |  | 2012 |  | 2011 |  | 2010
Mortgage servicing rights: |  |  |  |  |  |
Carrying amount, net, beginning of year |  | $ | 9,301 |  |  | $ | 10,488 |  |  | $ | 10,780 |
Additions |  | 3,399 |  |  | 1,659 |  |  | 3,062 |
Amortization |  | (3,634 | ) |  | (2,573 | ) |  | (3,180 | )
Change in valuation allowance |  | (1,303 | ) |  | (273 | ) |  | (174 | )
Carrying amount, net, end of year |  | $ | 7,763 |  |  | $ | 9,301 |  |  | $ | 10,488 |
Valuation allowance: |  |  |  |  |  |
Beginning of year |  | $ | 1,021 |  |  | $ | 748 |  |  | $ | 574 |
Additions expensed |  | 1,303 |  |  | 273 |  |  | 174 |
End of year |  | $ | 2,324 |  |  | $ | 1,021 |  |  | $ | 748 |

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- Definition Tabular disclosure of the activity in the balance of servicing assets subsequently measured at amortized value (including a description of where changes in carrying value are reported in the statement of income for each period for which results of operations are presented), including but not limited to, the following: beginning and ending balances, additions (through purchases of servicing assets and servicing assets that result from transfers of financial assets), disposals, amortization, application of valuation allowances, other-than-temporary impairments, and other changes that affect the balance along with a description of those changes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4/FIN46(R)-8 -Paragraph B10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 17 -Subparagraph g -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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