Capital Requirements And Regulatory Agreements (Southwest’s, Stillwater National’s, and Bank of Kansas’ Actual Capital Amounts And Ratios) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Southwest [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital, Actual, Amount	$ 339,964	$ 395,292
Total Capital to risk-weighted assets, Actual, Ratio	21.56%	20.78%
Total Capital, For Capital Adequacy Purposes, Amount	126,122	152,211
Total Capital to risk-weighted assets, For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Tier 1 Capital, Actual, Amount	319,665	371,114
Tier 1 Capital to risk-weighted assets, Actual, Ratio	20.28%	19.51%
Tier 1 Capital, For Capital Adequacy Purposes, Amount	63,061	76,106
Tier 1 Capital to risk-weighted assets, For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Tier 1 Leverage, Actual, Amount	319,665	371,114
Tier 1 Leverage to average assets, Actual, Ratio	15.01%	14.50%
Tier 1 Leverage, For Capital Adequacy Purposes, Amount	85,201	102,346
Tier 1 Leverage to average assets, For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Stillwater National [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital, Actual, Amount	269,323	314,550
Total Capital to risk-weighted assets, Actual, Ratio	19.55%	18.56%
Total Capital, To Be Well Capitalized, Amount	137,793	169,462
Total Capital to risk-weighted assets, To Be Well Capitalized, Ratio	10.00%	10.00%
Total Capital, For Capital Adequacy Purposes, Amount	110,234	135,570
Total Capital to risk-weighted assets, For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Tier 1 Capital, Actual, Amount	236,705	278,079
Tier 1 Capital to risk-weighted assets, Actual, Ratio	17.18%	16.41%
Tier 1 Capital, To Be Well Capitalized, Amount	82,676	101,677
Tier 1 Capital to risk-weighted assets, To Be Well Capitalized, Ratio	6.00%	6.00%
Tier 1 Capital, For Capital Adequacy Purposes, Amount	55,117	67,785
Tier 1 Capital to risk-weighted assets, For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Tier 1 Leverage, Actual, Amount	236,705	278,079
Tier 1 Leverage to average assets, Actual, Ratio	13.14%	12.53%
Tier 1 Leverage, To Be Well Capitalized, Amount	90,088	110,966
Tier 1 Leverage to average assets, To Be Well Capitalized, Ratio	5.00%	5.00%
Tier 1 Leverage, For Capital Adequacy Purposes, Amount	72,070	88,773
Tier 1 Leverage to average assets, For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Bank Of Kansas [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital, Actual, Amount	33,356	35,731
Total Capital to risk-weighted assets, Actual, Ratio	18.37%	18.82%
Total Capital, To Be Well Capitalized, Amount	18,161	18,984
Total Capital to risk-weighted assets, To Be Well Capitalized, Ratio	10.00%	10.00%
Total Capital, For Capital Adequacy Purposes, Amount	14,529	15,187
Total Capital to risk-weighted assets, For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Tier 1 Capital, Actual, Amount	31,064	33,325
Tier 1 Capital to risk-weighted assets, Actual, Ratio	17.10%	17.55%
Tier 1 Capital, To Be Well Capitalized, Amount	10,896	11,390
Tier 1 Capital to risk-weighted assets, To Be Well Capitalized, Ratio	6.00%	6.00%
Tier 1 Capital, For Capital Adequacy Purposes, Amount	7,264	7,593
Tier 1 Capital to risk-weighted assets, For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Tier 1 Leverage, Actual, Amount	31,064	33,325
Tier 1 Leverage to average assets, Actual, Ratio	10.02%	10.32%
Tier 1 Leverage, To Be Well Capitalized, Amount	15,506	16,143
Tier 1 Leverage to average assets, To Be Well Capitalized, Ratio	5.00%	5.00%
Tier 1 Leverage, For Capital Adequacy Purposes, Amount	$ 12,405	$ 12,914
Tier 1 Leverage to average assets, For Capital Adequacy Purposes, Ratio	4.00%	4.00%