Note 6: Investment Securities: Schedule of Available-for-sale Securities Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Available-for-sale Securities, Amortized Cost Basis	$ 575,272
Available-for-sale Securities Fair Value	580,980
Available-for-sale Securities
Available-for-sale Securities, Amortized Cost Basis	575,272	781,395
Available For Sale Debt Securities Gross Unrealized Gain	11,847	26,437
Available For Sale Debt Securities Gross Unrealized Loss	6,139	822
Available-for-sale Securities Fair Value	580,980	807,010
Available for Sale Securities Tax Equivalent Yield	2.39%	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	2,170
Available-for-sale Securities Fair Value	17,830	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	391,320	582,039
Available For Sale Debt Securities Gross Unrealized Gain	5,435	14,861
Available For Sale Debt Securities Gross Unrealized Loss	2,862	814
Available-for-sale Securities Fair Value	393,893	596,086
Available for Sale Securities Tax Equivalent Yield	1.59%	2.42%
SmallBusinessAdministrationLoanPoolsMember
Available-for-sale Securities, Amortized Cost Basis	45,478	50,198
Available For Sale Debt Securities Gross Unrealized Gain	1,650	1,295
Available-for-sale Securities Fair Value	47,128	51,493
Available for Sale Securities Tax Equivalent Yield	1.46%	1.99%
US States and Political Subdivisions Debt Securities
Available-for-sale Securities, Amortized Cost Basis	117,627	114,372
Available For Sale Debt Securities Gross Unrealized Gain	3,037	8,506
Available For Sale Debt Securities Gross Unrealized Loss	1,107
Available-for-sale Securities Fair Value	119,557	122,878
Available for Sale Securities Tax Equivalent Yield	5.51%	5.61%
Equity Securities
Available-for-sale Securities, Amortized Cost Basis	847	847
Available For Sale Debt Securities Gross Unrealized Gain	1,725	1,159
Available-for-sale Securities Fair Value	2,572	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%