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Note 6: Investment Securities (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Available-for-sale Securities, Amortized Cost Basis | $ 730,587 |
Available-for-sale Securities Fair Value | 744,439 |
Available-for-sale Securities, Amortized Cost Basis, Total | 730,587 |
Available-for-sale Securities Fair Value | 744,439 |
Available-for-sale Securities |  |
Available-for-sale Securities, Amortized Cost Basis | 730,587 | 781,395
Available For Sale Debt Securities Gross Unrealized Gain | 17,093 | 26,437
Available For Sale Debt Securities Gross Unrealized Loss | 3,241 | 822
Available-for-sale Securities Fair Value | 744,439 | 807,010
Available for Sale Securities Tax Equivalent Yield | 2.56% | 2.80%
Available-for-sale Securities, Amortized Cost Basis, Total | 730,587 | 781,395
Available For Sale Debt Securities Gross Unrealized Gain | 17,093 | 26,437
Available For Sale Debt Securities Gross Unrealized Loss | 3,241 | 822
Available-for-sale Securities Fair Value | 744,439 | 807,010
Available for Sale Securities Tax Equivalent Yield | 2.56% | 2.80%
US Government Agencies Debt Securities |  |
Available-for-sale Securities, Amortized Cost Basis | 20,000 | 30,000
Available For Sale Debt Securities Gross Unrealized Gain |  | 40
Available For Sale Debt Securities Gross Unrealized Loss | 856 |
Available-for-sale Securities Fair Value | 19,144 | 30,040
Available for Sale Securities Tax Equivalent Yield | 2.00% | 1.25%
Available-for-sale Securities, Amortized Cost Basis, Total | 20,000 | 30,000
Available For Sale Debt Securities Gross Unrealized Gain |  | 40
Available For Sale Debt Securities Gross Unrealized Loss | 856 |
Available-for-sale Securities Fair Value | 19,144 | 30,040
Available for Sale Securities Tax Equivalent Yield | 2.00% | 1.25%
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises |  |
Available-for-sale Securities, Amortized Cost Basis | 549,434 | 582,039
Available For Sale Debt Securities Gross Unrealized Gain | 10,003 | 14,861
Available For Sale Debt Securities Gross Unrealized Loss | 1,647 | 814
Available-for-sale Securities Fair Value | 557,790 | 596,086
Available for Sale Securities Tax Equivalent Yield | 2.04% | 2.42%
Available-for-sale Securities, Amortized Cost Basis, Total | 549,434 | 582,039
Available For Sale Debt Securities Gross Unrealized Gain | 10,003 | 14,861
Available For Sale Debt Securities Gross Unrealized Loss | 1,647 | 814
Available-for-sale Securities Fair Value | 557,790 | 596,086
Available for Sale Securities Tax Equivalent Yield | 2.04% | 2.42%
Small Business Administration loan pools |  |
Available-for-sale Securities, Amortized Cost Basis | 47,539 | 50,198
Available For Sale Debt Securities Gross Unrealized Gain | 2,009 | 1,295
Available-for-sale Securities Fair Value | 49,548 | 51,493
Available for Sale Securities Tax Equivalent Yield | 1.90% | 1.99%
Available-for-sale Securities, Amortized Cost Basis, Total | 47,539 | 50,198
Available For Sale Debt Securities Gross Unrealized Gain | 2,009 | 1,295
Available-for-sale Securities Fair Value | 49,548 | 51,493
Available for Sale Securities Tax Equivalent Yield | 1.90% | 1.99%
US States and Political Subdivisions Debt Securities |  |
Available-for-sale Securities, Amortized Cost Basis | 112,767 | 114,372
Available For Sale Debt Securities Gross Unrealized Gain | 3,454 | 8,506
Available For Sale Debt Securities Gross Unrealized Loss | 738 |
Available-for-sale Securities Fair Value | 115,483 | 122,878
Available for Sale Securities Tax Equivalent Yield | 5.53% | 5.61%
Available-for-sale Securities, Amortized Cost Basis, Total | 112,767 | 114,372
Available For Sale Debt Securities Gross Unrealized Gain | 3,454 | 8,506
Available For Sale Debt Securities Gross Unrealized Loss | 738 |
Available-for-sale Securities Fair Value | 115,483 | 122,878
Available for Sale Securities Tax Equivalent Yield | 5.53% | 5.61%
Equity Securities |  |
Available-for-sale Securities, Amortized Cost Basis | 847 | 847
Available For Sale Debt Securities Gross Unrealized Gain | 1,627 | 1,159
Available-for-sale Securities Fair Value | 2,474 | 2,006
Available-for-sale Securities, Amortized Cost Basis, Total | 847 | 847
Available For Sale Debt Securities Gross Unrealized Gain | 1,627 | 1,159
Available-for-sale Securities Fair Value | 2,474 | 2,006
Collateralized Mortgage Obligations |  |
Available-for-sale Securities, Amortized Cost Basis |  | 3,939
Available For Sale Debt Securities Gross Unrealized Gain |  | 576
Available For Sale Debt Securities Gross Unrealized Loss |  | 8
Available-for-sale Securities Fair Value |  | 4,507
Available for Sale Securities Tax Equivalent Yield |  | 1.72%
Available-for-sale Securities, Amortized Cost Basis, Total |  | 3,939
Available For Sale Debt Securities Gross Unrealized Gain |  | 576
Available For Sale Debt Securities Gross Unrealized Loss |  | 8
Available-for-sale Securities Fair Value |  | $ 4,507
Available for Sale Securities Tax Equivalent Yield |  | 1.72%

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