Operating Segments (Financial Results By Operating Segment) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Financial results by operating segment
Net interest income	$ 15,837,000	$ 15,273,000	$ 48,412,000		$ 46,013,000
Provision for loan losses	(2,897,000)	(329,000)	(4,238,000)		(707,000)
Noninterest income	3,084,000	3,547,000	14,355,000		10,575,000
Noninterest expenses	13,358,000	13,019,000	42,797,000		40,246,000
Income (loss) before taxes	8,460,000	6,130,000	24,208,000		17,049,000
Taxes on income	3,172,000	2,330,000	9,077,000		6,446,000
Net income (loss)	5,288,000	3,800,000	15,131,000		10,603,000
Externally generated revenue from investing activities			6,000,000		1,400,000
Internally generated loss from fund management			1,900,000		36,000
Total loans at period end	1,367,388,000	1,306,625,000	1,367,388,000		1,306,625,000		1,270,903,000
Total assets at period end	1,900,948,000	1,972,367,000	1,900,948,000		1,972,367,000		1,981,423,000
Total deposits at period end	1,494,946,000	1,583,791,000	1,494,946,000		1,583,791,000		1,584,086,000
Oklahoma Banking [Member]
Financial results by operating segment
Net interest income	9,902,000	9,008,000	28,026,000		25,699,000
Provision for loan losses	(1,142,000)	1,012,000	(626,000)		1,168,000
Noninterest income	1,717,000	1,731,000	5,139,000		5,285,000
Noninterest expenses	7,169,000	6,570,000	21,530,000		20,817,000
Income (loss) before taxes	5,592,000	3,157,000	12,261,000		8,999,000
Taxes on income	2,097,000	1,200,000	4,598,000		3,403,000
Net income (loss)	3,495,000	1,957,000	7,663,000		5,596,000
Total loans at period end	777,033,000	681,745,000	777,033,000		681,745,000
Total assets at period end	784,343,000	684,529,000	784,343,000		684,529,000
Total deposits at period end	1,069,278,000	1,128,753,000	1,069,278,000		1,128,753,000
Texas Banking [Member]
Financial results by operating segment
Net interest income	5,141,000	4,489,000	14,230,000		14,097,000
Provision for loan losses	(867,000)	(1,387,000)	(3,350,000)		(2,950,000)
Noninterest income	409,000	310,000	948,000		1,004,000
Noninterest expenses	3,423,000	2,524,000	9,883,000		6,211,000
Income (loss) before taxes	2,994,000	3,662,000	8,645,000		11,840,000
Taxes on income	1,123,000	1,395,000	3,242,000		4,477,000
Net income (loss)	1,871,000	2,267,000	5,403,000		7,363,000
Total loans at period end	424,640,000	414,433,000	424,640,000		414,433,000
Total assets at period end	422,209,000	407,532,000	422,209,000		407,532,000
Total deposits at period end	206,268,000	188,391,000	206,268,000		188,391,000
Kansas Banking [Member]
Financial results by operating segment
Net interest income	1,543,000	2,736,000	6,998,000		7,782,000
Provision for loan losses	(897,000)	39,000	(238,000)		69,000
Noninterest income	341,000	470,000	1,242,000		1,420,000
Noninterest expenses	1,424,000	2,579,000	6,710,000		8,653,000
Income (loss) before taxes	1,357,000	588,000	1,768,000		480,000
Taxes on income	509,000	222,000	663,000		182,000
Net income (loss)	848,000	366,000	1,105,000		298,000
Total loans at period end	142,547,000	206,802,000	142,547,000		206,802,000
Total assets at period end	144,786,000	211,237,000	144,786,000		211,237,000
Total deposits at period end	114,432,000	250,597,000	114,432,000		250,597,000
Mortgage Banking [Member]
Financial results by operating segment
Net interest income	204,000	166,000	552,000		467,000
Provision for loan losses	8,000	7,000	(25,000)		(6,000)
Noninterest income	506,000	662,000	1,533,000		2,223,000
Noninterest expenses	579,000	575,000	1,670,000		1,749,000
Income (loss) before taxes	123,000	246,000	440,000		947,000
Taxes on income	45,000	94,000	164,000		358,000
Net income (loss)	78,000	152,000	276,000		589,000
Total loans at period end	23,164,000	3,641,000	23,164,000		3,641,000
Total assets at period end	26,517,000	6,591,000	26,517,000		6,591,000
Total deposits at period end	7,907,000	5,666,000	7,907,000		5,666,000
Other Operations [Member]
Financial results by operating segment
Net interest income	(953,000)	(1,126,000)	(1,394,000)	[1]	(2,032,000)	[2]
Provision for loan losses	1,000		1,000	[1]	1,012,000	[2]
Noninterest income	111,000	374,000	5,493,000	[1]	643,000	[2]
Noninterest expenses	763,000	771,000	3,004,000	[1]	2,816,000	[2]
Income (loss) before taxes	(1,606,000)	(1,523,000)	1,094,000	[1]	(5,217,000)	[2]
Taxes on income	(602,000)	(581,000)	410,000	[1]	(1,974,000)	[2]
Net income (loss)	(1,004,000)	(942,000)	684,000	[1]	(3,243,000)	[2]
Total loans at period end	4,000	4,000	4,000		4,000
Total assets at period end	523,093,000	662,478,000	523,093,000		662,478,000
Total deposits at period end	$ 97,061,000	$ 10,384,000	$ 97,061,000		$ 10,384,000

[1] * Includes externally generated revenue of $6.0 million, primarily from investing services, and an internally generated loss of $1.9 million from the funds management unit

[2] * Includes externally generated loss of $1.4 million, primarily from investing services, and an internally generated loss of $36,000 from the funds management unit