Investment Securities: Schedule of Available for Sale Securities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
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%

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.

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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.

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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.

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