Operating Segments (Financial Results By Operating Segment) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financial results by operating segment
Net interest income	$ 62,650,000	$ 76,563,000	$ 96,332,000
Provision for loan losses	(7,209,000)	3,107,000	132,101,000
Noninterest income	13,643,000	15,936,000	14,018,000
Noninterest expenses	55,311,000	63,322,000	90,201,000
Income (loss) before taxes	28,191,000	26,070,000	(111,952,000)
Taxes on income	10,756,000	9,883,000	(43,657,000)
Net income (loss)	17,435,000	16,187,000	(68,295,000)
Fixed asset expenditures	1,855,000	1,619,000	1,686,000
Total loans at period end	1,270,903,000	1,378,735,000	1,763,488,000
Total assets at period end	1,981,423,000	2,122,255,000	2,377,276,000
Total deposits at period end	1,584,086,000	1,709,578,000	1,921,382,000
Oklahoma Banking [Member]
Financial results by operating segment
Net interest income	34,725,000	37,954,000	43,005,000
Provision for loan losses	(486,000)	448,000	27,087,000
Noninterest income	6,943,000	7,697,000	7,781,000
Noninterest expenses	28,000,000	29,406,000	36,402,000
Income (loss) before taxes	14,154,000	15,797,000	(12,703,000)
Taxes on income	5,400,000	5,989,000	(4,955,000)
Net income (loss)	8,754,000	9,808,000	(7,748,000)
Fixed asset expenditures	85,000	178,000	366,000
Total loans at period end	681,991,000	652,121,000	858,212,000
Total assets at period end	686,736,000	664,607,000	888,839,000
Total deposits at period end	1,113,715,000	1,254,348,000	1,406,361,000
Texas Banking [Member]
Financial results by operating segment
Net interest income	18,949,000	25,190,000	29,820,000
Provision for loan losses	(6,403,000)	5,364,000	98,335,000
Noninterest income	1,305,000	1,854,000	1,856,000
Noninterest expenses	9,494,000	12,848,000	28,727,000
Income (loss) before taxes	17,163,000	8,832,000	(95,386,000)
Taxes on income	6,548,000	3,348,000	(37,196,000)
Net income (loss)	10,615,000	5,484,000	(58,190,000)
Fixed asset expenditures	9,000	71,000	3,000
Total loans at period end	366,697,000	520,481,000	653,199,000
Total assets at period end	361,058,000	515,675,000	653,146,000
Total deposits at period end	207,227,000	166,919,000	156,101,000
Kansas Banking [Member]
Financial results by operating segment
Net interest income	10,527,000	9,685,000	12,414,000
Provision for loan losses	(472,000)	(2,705,000)	6,679,000
Noninterest income	1,944,000	2,440,000	2,065,000
Noninterest expenses	11,898,000	13,767,000	19,131,000
Income (loss) before taxes	1,045,000	1,063,000	(11,331,000)
Taxes on income	399,000	403,000	(4,419,000)
Net income (loss)	646,000	660,000	(6,912,000)
Fixed asset expenditures	8,000	8,000	193,000
Total loans at period end	198,992,000	174,451,000	213,382,000
Total assets at period end	203,631,000	178,291,000	219,481,000
Total deposits at period end	247,884,000	270,368,000	276,757,000
Secondary Market [Member]
Financial results by operating segment
Net interest income	670,000	1,370,000	1,438,000
Provision for loan losses	148,000
Noninterest income	2,701,000	2,771,000	1,297,000
Noninterest expenses	2,287,000	2,430,000	2,121,000
Income (loss) before taxes	936,000	1,711,000	614,000
Taxes on income	357,000	649,000	240,000
Net income (loss)	579,000	1,062,000	374,000
Fixed asset expenditures			5,000
Total loans at period end	23,215,000	31,682,000	38,695,000
Total assets at period end	26,162,000	34,304,000	40,876,000
Total deposits at period end	1,895,000	2,420,000	1,430,000
Other Operations [Member]
Financial results by operating segment
Net interest income	(2,221,000)	2,364,000	9,655,000
Provision for loan losses	4,000
Noninterest income	750,000	1,174,000	1,019,000
Noninterest expenses	3,632,000	4,871,000	3,820,000
Income (loss) before taxes	(5,107,000)	(1,333,000)	6,854,000
Taxes on income	(1,948,000)	(506,000)	2,673,000
Net income (loss)	(3,159,000)	(827,000)	4,181,000
Externally generated revenue from investing activities	1,600,000	800,000	2,800,000
Internally generated loss from fund management	100,000	2,800,000	7,900,000
Fixed asset expenditures	1,753,000	1,362,000	1,119,000
Total loans at period end	8,000
Total assets at period end	703,836,000	729,378,000	574,934,000
Total deposits at period end	$ 13,365,000	$ 15,523,000	$ 80,733,000