Operating Segments (Financial Results By Operating Segment) (Details) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2010		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010		Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011
Financial results by operating segment
Net interest income			$ 76,563,000		$ 96,332,000		$ 107,331,000
Provision for loan losses			3,107,000		132,101,000		35,560,000
Noninterest income			15,936,000		14,018,000		18,564,000
Noninterest expenses	22,408,000		63,322,000		90,201,000		69,230,000
Income (loss) before taxes			26,070,000		(111,952,000)		21,105,000
Taxes on income			9,883,000		(43,657,000)		9,738,000
Net income (loss)			16,187,000		(68,295,000)		11,367,000
Fixed asset expenditures			1,619,000		1,686,000		1,037,000
Total loans at period end	2,420,115,000		1,378,735,000		1,763,488,000		2,420,115,000
Total assets at period end	2,814,944,000		2,122,255,000		2,377,276,000		2,814,944,000		2,151,153,000	2,264,123,000	2,268,264,000	2,566,895,000	2,654,898,000	2,773,431,000
Total deposits at period end	2,252,728,000		1,709,578,000		1,921,382,000		2,252,728,000
Oklahoma Banking [Member]
Financial results by operating segment
Net interest income			36,846,000		44,494,000		43,278,000
Provision for loan losses			(2,699,000)		16,226,000		66,000
Noninterest income			7,623,000		7,709,000		8,178,000
Noninterest expenses			27,861,000		30,821,000		28,020,000
Income (loss) before taxes			19,307,000		5,156,000		23,370,000
Taxes on income			7,319,000		2,010,000		8,522,000
Net income (loss)			11,988,000		3,146,000		14,848,000
Fixed asset expenditures			178,000		366,000		161,000
Total loans at period end	871,393,000		536,855,000		688,592,000		871,393,000
Total assets at period end	899,269,000		558,332,000		720,815,000		899,269,000
Total deposits at period end	1,565,124,000		1,254,347,000		1,406,360,000		1,565,124,000
Texas Banking [Member]
Financial results by operating segment
Net interest income			28,947,000		36,619,000		42,311,000
Provision for loan losses			375,000		75,027,000		22,992,000
Noninterest income			1,818,000		1,816,000		1,726,000
Noninterest expenses			12,668,000		27,723,000		13,740,000
Income (loss) before taxes			17,722,000		(64,315,000)		7,305,000
Taxes on income			6,719,000		(25,079,000)		2,664,000
Net income (loss)			11,003,000		(39,236,000)		4,641,000
Fixed asset expenditures			71,000		3,000		40,000
Total loans at period end	982,845,000		491,442,000		665,010,000		982,845,000
Total assets at period end	976,383,000		491,024,000		665,846,000		976,383,000
Total deposits at period end	160,181,000		166,919,000		156,102,000		160,181,000
Kansas Banking [Member]
Financial results by operating segment
Net interest income			11,929,000		13,814,000		14,387,000
Provision for loan losses			(3,123,000)		9,494,000		3,605,000
Noninterest income			2,332,000		1,956,000		2,437,000
Noninterest expenses			13,683,000		17,820,000		17,864,000
Income (loss) before taxes			3,701,000		(11,544,000)		(4,645,000)
Taxes on income			1,403,000		(4,501,000)		347,000
Net income (loss)			2,298,000		(7,043,000)		(4,992,000)
Fixed asset expenditures			8,000		193,000		152,000
Total loans at period end	289,642,000		184,330,000		238,468,000		289,642,000
Total assets at period end	304,203,000		188,576,000		245,005,000		304,203,000
Total deposits at period end	268,867,000		270,369,000		276,757,000		268,867,000
Out Of Market [Member]
Financial results by operating segment
Net interest income			5,363,000		6,565,000		8,445,000
Provision for loan losses			8,554,000		31,293,000		8,897,000
Noninterest income			218,000		221,000		368,000
Noninterest expenses			1,808,000		7,896,000		2,919,000
Income (loss) before taxes			(4,781,000)		(32,403,000)		(3,003,000)
Taxes on income			(1,813,000)		(12,636,000)		(1,095,000)
Net income (loss)			(2,968,000)		(19,767,000)		(1,908,000)
Total loans at period end	241,041,000		134,426,000		132,723,000		241,041,000
Total assets at period end	231,591,000		127,478,000		136,579,000		231,591,000
Secondary Market [Member]
Financial results by operating segment
Net interest income			1,383,000		1,456,000		1,500,000
Provision for loan losses					61,000
Noninterest income			2,771,000		1,297,000		2,359,000
Noninterest expenses			2,430,000		2,121,000		2,269,000
Income (loss) before taxes			1,724,000		571,000		1,590,000
Taxes on income			654,000		223,000		580,000
Net income (loss)			1,070,000		348,000		1,010,000
Fixed asset expenditures					5,000		52,000
Total loans at period end	35,194,000		31,682,000		38,695,000		35,194,000
Total assets at period end	37,483,000		34,304,000		40,876,000		37,483,000
Total deposits at period end	1,389,000		2,420,000		1,430,000		1,389,000
Other Operations [Member]
Financial results by operating segment
Net interest income			(7,905,000)	[1]	(6,616,000)	[2]	(2,590,000)	[3]
Noninterest income			1,174,000	[1]	1,019,000	[2]	3,496,000	[3]
Noninterest expenses			4,872,000	[1]	3,820,000	[2]	4,418,000	[3]
Income (loss) before taxes			(11,603,000)	[1]	(9,417,000)	[2]	(3,512,000)	[3]
Taxes on income			(4,399,000)	[1]	(3,674,000)	[2]	(1,280,000)	[3]
Net income (loss)			(7,204,000)	[1]	(5,743,000)	[2]	(2,232,000)	[3]
Externally generated revenue from investing activities			1,700,000		3,900,000		7,900,000
Internally generated loss from fund management			8,500,000		9,500,000		7,000,000
Fixed asset expenditures			1,362,000	[1]	1,119,000	[2]	632,000	[3]
Total assets at period end	366,015,000	[3]	722,541,000	[1]	568,155,000	[2]	366,015,000	[3]
Total deposits at period end	$ 257,167,000	[3]	$ 15,523,000	[1]	$ 80,733,000	[2]	$ 257,167,000	[3]

[1] Includes externally generated revenue of $1.7 million, primarily from investing services, and an internally generated loss of $8.5 million from the funds management unit

[2] Includes externally generated revenue of $3.9 million, primarily from investing services, and an internally generated loss of $9.5 million from the funds management unit

[3] Includes externally generated revenue of $7.9 million, primarily from investing services, and an internally generated loss of $7.0 million from the funds management unit