Operating Segments (Financial Results By Operating Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Financial results by operating segment
Net interest income	$ 15,791	$ 16,574	$ 31,401	$ 32,575
Provision (credit) for loan losses	(1,136)	(355)	(3,023)	(1,341)
Noninterest income	3,409	8,246	6,249	11,271
Noninterest expenses	13,982	15,332	27,064	29,439
Income before taxes	6,354	9,843	13,609	15,748
Taxes on income (loss)	2,193	3,691	4,913	5,905
Net income	4,161	6,152	8,696	9,843
Externally generated revenue from investing activities			700	500
Internally generated loss from fund management			1,000	4,400
Total loans at period end	1,449,430	1,351,700	1,449,430	1,351,700
Total assets at period end	2,031,581	1,885,158	2,031,581	1,885,158
Total deposits at period end	1,624,446	1,463,855	1,624,446	1,463,855
Oklahoma Banking [Member] | Operating Segments [Member]
Financial results by operating segment
Net interest income	9,299	9,497	19,034	18,473
Provision (credit) for loan losses	(689)	(1,464)	(1,922)	483
Noninterest income	2,386	2,332	4,425	4,449
Noninterest expenses	7,698	7,871	15,043	15,452
Income before taxes	4,676	5,422	10,338	6,987
Taxes on income (loss)	1,609	2,034	3,732	2,620
Net income	3,067	3,388	6,606	4,367
Total loans at period end	810,368	798,065	810,368	798,065
Total assets at period end	824,073	807,002	824,073	807,002
Total deposits at period end	1,134,020	1,086,659	1,134,020	1,086,659
Texas Banking [Member] | Operating Segments [Member]
Financial results by operating segment
Net interest income	4,793	4,457	10,013	9,089
Provision (credit) for loan losses	(283)	1,449	(533)	(2,483)
Noninterest income	278	243	587	539
Noninterest expenses	3,793	3,232	7,228	6,460
Income before taxes	1,561	19	3,905	5,651
Taxes on income (loss)	531	7	1,410	2,119
Net income	1,030	12	2,495	3,532
Total loans at period end	493,047	408,385	493,047	408,385
Total assets at period end	491,442	405,524	491,442	405,524
Total deposits at period end	226,498	206,031	226,498	206,031
Kansas Banking [Member] | Operating Segments [Member]
Financial results by operating segment
Net interest income	1,731	3,075	3,194	5,455
Provision (credit) for loan losses	(165)	(340)	(568)	659
Noninterest income	329	420	631	901
Noninterest expenses	1,606	2,658	3,215	5,286
Income before taxes	619	1,177	1,178	411
Taxes on income (loss)	216	441	425	154
Net income	403	736	753	257
Total loans at period end	146,015	145,247	146,015	145,247
Total assets at period end	147,302	147,644	147,302	147,644
Total deposits at period end	126,671	111,615	126,671	111,615
Other Operations [Member] | Operating Segments [Member]
Financial results by operating segment
Net interest income	(32)	(455)	(840)	(442)
Provision (credit) for loan losses	1
Noninterest income	416	5,251	606	5,382
Noninterest expenses	885	1,571	1,578	2,241
Income before taxes	(502)	3,225	(1,812)	2,699
Taxes on income (loss)	(163)	1,209	(654)	1,012
Net income	(339)	2,016	(1,158)	1,687
Total loans at period end		3		3
Total assets at period end	568,764	524,988	568,764	524,988
Total deposits at period end	$ 137,257	$ 59,550	$ 137,257	$ 59,550