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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%