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Investment Securities: Schedule of Available for Sale Securities (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
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US government agencies |  |
Available-for-sale Securities, Amortized Cost Basis | $ 30,000 | $ 20,000
Available-for-sale Securities, Gross Unrealized Gains | 18 | 60
Available-for-sale Securities, Fair Value Disclosure | 30,018 | 20,060
Available for Sale Securities Tax Equivalent Yield | 1.25% | 1.12%
Fair value collateralized mortgage obligations |  |
Available-for-sale Securities, Amortized Cost Basis | 4,858 | 5,220
Available-for-sale Securities, Gross Unrealized Gains | 154 |
Available-for-sale Securities, Gross Unrealized Losses | 239 | 380
Available-for-sale Securities, Fair Value Disclosure | 4,773 | 4,840
Available for Sale Securities Tax Equivalent Yield | 5.29% | 5.53%
Fair value mortgage-backed securities |  |
Available-for-sale Securities, Amortized Cost Basis | 585,327 | 628,729
Available-for-sale Securities, Gross Unrealized Gains | 14,904 | 13,728
Available-for-sale Securities, Gross Unrealized Losses | 75 | 802
Available-for-sale Securities, Fair Value Disclosure | 600,156 | 641,655
Available for Sale Securities Tax Equivalent Yield | 2.75% | 3.12%
Small Business Administration loan pools |  |
Available-for-sale Securities, Amortized Cost Basis | 53,027 | 55,422
Available-for-sale Securities, Gross Unrealized Gains | 723 | 1,070
Available-for-sale Securities, Gross Unrealized Losses | 11 |
Available-for-sale Securities, Fair Value Disclosure | 53,739 | 56,492
Available for Sale Securities Tax Equivalent Yield | 1.83% | 1.68%
States and political subdivisions |  |
Available-for-sale Securities, Amortized Cost Basis | 120,141 | 145,663
Available-for-sale Securities, Gross Unrealized Gains | 7,644 | 5,478
Available-for-sale Securities, Gross Unrealized Losses |  | 903
Available-for-sale Securities, Fair Value Disclosure | 127,785 | 150,238
Available for Sale Securities Tax Equivalent Yield | 5.66% | 5.72%
Corporate bonds |  |
Available-for-sale Securities, Amortized Cost Basis | 49 | 50
Available-for-sale Securities, Gross Unrealized Gains | 245 | 245
Available-for-sale Securities, Fair Value Disclosure | 294 | 295
Available for Sale Securities Tax Equivalent Yield | 42.08% | 39.65%
Fair value equity securities |  |
Available-for-sale Securities, Amortized Cost Basis | 1,230 | 1,230
Available-for-sale Securities, Gross Unrealized Gains | 1,196 | 601
Available-for-sale Securities, Fair Value Disclosure | 2,426 | 1,831
Total Available for Sale Securities |  |
Available-for-sale Securities, Amortized Cost Basis | 794,632 | 856,314
Available-for-sale Securities, Gross Unrealized Gains | 24,884 | 21,182
Available-for-sale Securities, Gross Unrealized Losses | 325 | 2,085
Available-for-sale Securities, Fair Value Disclosure | $ 819,191 | $ 875,411
Available for Sale Securities Tax Equivalent Yield | 3.09% | 3.44%

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 -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 Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph 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 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 -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 Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 19 -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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 + Details
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