Operating Segments (Financial Results By Operating Segment) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013
Financial results by operating segment
Net interest income	$ 16,574,000	$ 15,134,000	$ 32,575,000		$ 30,740,000
Provision for loan losses	(355,000)	(876,000)	(1,341,000)		(378,000)
Noninterest income	8,246,000	3,491,000	11,271,000		7,028,000
Noninterest expenses	15,332,000	12,839,000	29,439,000		27,227,000
Income (loss) before taxes	9,843,000	6,662,000	15,748,000		10,919,000
Taxes on income	3,691,000	2,248,000	5,905,000		4,116,000
Net income (loss)	6,152,000	4,414,000	9,843,000		6,803,000
Externally generated revenue from investing activities			5,600,000		1,100,000
Internally generated loss from fund management			700,000		400,000
Total loans at period end	1,351,700,000	1,318,089,000	1,351,700,000		1,318,089,000		1,270,903,000
Total assets at period end	1,885,158,000	2,031,962,000	1,885,158,000		2,031,962,000		1,981,423,000
Total deposits at period end	1,463,855,000	1,615,961,000	1,463,855,000		1,615,961,000		1,584,086,000
Oklahoma Banking [Member]
Financial results by operating segment
Net interest income	9,295,000	8,434,000	18,124,000		16,693,000
Provision for loan losses	(1,460,000)	(714,000)	516,000		156,000
Noninterest income	1,722,000	1,787,000	3,422,000		3,554,000
Noninterest expenses	7,302,000	6,876,000	14,361,000		14,247,000
Income (loss) before taxes	5,175,000	4,059,000	6,669,000		5,844,000
Taxes on income	1,941,000	1,420,000	2,501,000		2,203,000
Net income (loss)	3,234,000	2,639,000	4,168,000		3,641,000
Total loans at period end	773,663,000	656,352,000	773,663,000		656,352,000
Total assets at period end	779,315,000	661,036,000	779,315,000		661,036,000
Total deposits at period end	1,079,566,000	1,171,876,000	1,079,566,000		1,171,876,000
Texas Banking [Member]
Financial results by operating segment
Net interest income	4,457,000	4,593,000	9,089,000		9,608,000
Provision for loan losses	1,449,000	(1,269,000)	(2,483,000)		(1,563,000)
Noninterest income	243,000	307,000	539,000		694,000
Noninterest expenses	3,232,000	1,080,000	6,460,000		3,687,000
Income (loss) before taxes	19,000	5,089,000	5,651,000		8,178,000
Taxes on income	7,000	1,727,000	2,119,000		3,082,000
Net income (loss)	12,000	3,362,000	3,532,000		5,096,000
Total loans at period end	408,385,000	444,327,000	408,385,000		444,327,000
Total assets at period end	405,524,000	436,460,000	405,524,000		436,460,000
Total deposits at period end	206,031,000	173,735,000	206,031,000		173,735,000
Kansas Banking [Member]
Financial results by operating segment
Net interest income	3,075,000	2,560,000	5,455,000		5,046,000
Provision for loan losses	(340,000)	107,000	659,000		30,000
Noninterest income	420,000	485,000	901,000		950,000
Noninterest expenses	2,658,000	3,179,000	5,286,000		6,074,000
Income (loss) before taxes	1,177,000	(241,000)	411,000		(108,000)
Taxes on income	441,000	(99,000)	154,000		(40,000)
Net income (loss)	736,000	(142,000)	257,000		(68,000)
Total loans at period end	145,247,000	210,189,000	145,247,000		210,189,000
Total assets at period end	147,644,000	215,489,000	147,644,000		215,489,000
Total deposits at period end	111,615,000	248,805,000	111,615,000		248,805,000
Mortgage Banking [Member]
Financial results by operating segment
Net interest income	201,000	165,000	348,000		301,000
Provision for loan losses	(4,000)	(12,000)	(33,000)		(13,000)
Noninterest income	610,000	847,000	1,027,000		1,561,000
Noninterest expenses	568,000	612,000	1,091,000		1,174,000
Income (loss) before taxes	247,000	412,000	317,000		701,000
Taxes on income	93,000	137,000	119,000		264,000
Net income (loss)	154,000	275,000	198,000		437,000
Total loans at period end	24,402,000	7,217,000	24,402,000		7,217,000
Total assets at period end	27,687,000	10,035,000	27,687,000		10,035,000
Total deposits at period end	7,093,000	4,807,000	7,093,000		4,807,000
Other Operations [Member]
Financial results by operating segment
Net interest income	(454,000)	(618,000)	(441,000)	[1]	(908,000)	[2]
Provision for loan losses		1,012,000			1,012,000
Noninterest income	5,251,000	65,000	5,382,000	[1]	269,000	[2]
Noninterest expenses	1,572,000	1,092,000	2,241,000	[1]	2,045,000	[2]
Income (loss) before taxes	3,225,000	(2,657,000)	2,700,000	[1]	(3,696,000)	[2]
Taxes on income	1,209,000	(937,000)	1,012,000	[1]	(1,393,000)	[2]
Net income (loss)	2,016,000	(1,720,000)	1,688,000	[1]	(2,303,000)	[2]
Total loans at period end	3,000	4,000	3,000		4,000
Total assets at period end	524,988,000	708,942,000	524,988,000		708,942,000
Total deposits at period end	$ 59,550,000	$ 16,738,000	$ 59,550,000		$ 16,738,000

[1] * Includes externally generated revenue of $5.6 million, primarily from investing services, and an internally generated loss of $0.7 million from the funds management unit

[2] * Includes externally generated loss of $1.1 million, primarily from investing services, and an internally generated revenue of $0.4 million from the funds management unit