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Investment Securities: Schedule of Debt Securities with Credit Loss Recognized in income (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Credit losses on debt securities held April 1, 2012 |  |  |  |
Accumulated Credit Losses | $ 3,598 |  |  |
Additions related to increases in credit losses for which OTTI losses previously recognized |  |  |  |
Accumulated Credit Losses | 262 | 400 | 262 | 400
Credit losses on debt securities held June 30, 2012 |  |  |  |
Accumulated Credit Losses | 3,860 |  | 3,860 |
Credit losses on debt securities held April 1, 2011 |  |  |  |
Accumulated Credit Losses |  | 2,983 |  |
Credit losses on debt securities held June 30, 2011 |  |  |  |
Accumulated Credit Losses |  | 3,383 |  | 3,383
Credit losses on debt securities held January 1, 2012 |  |  |  |
Accumulated Credit Losses |  |  | 3,598 |
Credit losses on debt securities held January 1, 2011 |  |  |  |
Accumulated Credit Losses |  |  |  | $ 2,983

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | fil_AccumulatedCreditLosses
Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration