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Capital Requirements And Regulatory Agreements (Southwest’s and Bank SNB's Actual Capital Amounts And Ratios) (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Southwest [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
CET1 Capital, Actual, Amount $ 272,882 $ 282,737
CET1 Capital to risk-weighted assets, Actual, Ratio 12.36 13.21
CET1 Capital, To Be Well Capitalized, Amount $ 143,488 $ 139,122
CET1 Capital to risk-weighted assets, To Be Well Capitalized, Ratio 6.50 6.50
CET1 Capital, For Capital Adequacy Purposes, Amount $ 99,338 $ 96,316
CET1 Capital to risk-weighted assets, For Capital Adequacy Purposes, Ratio 4.50 4.50
Total Capital, Actual, Amount $ 345,597 $ 359,300
Total Capital to risk-weighted assets, Actual, Ratio 15.66% 16.79%
Total Capital, To Be Well Capitalized, Amount $ 220,751 $ 214,034
Total Capital to risk-weighted assets, To Be Well Capitalized, Ratio 10.00% 10.00%
Total Capital, For Capital Adequacy Purposes, Amount $ 176,601 $ 171,228
Total Capital to risk-weighted assets, For Capital Adequacy Purposes, Ratio 8.00% 8.00%
Tier 1 Capital, Actual, Amount $ 317,882 $ 332,468
Tier 1 Capital to risk-weighted assets, Actual, Ratio 14.40% 15.53%
Tier 1 Capital, To Be Well Capitalized, Amount $ 176,601 $ 171,228
Tier 1 Capital to risk-weighted assets, To Be Well Capitalized, Ratio 8.00% 8.00%
Tier 1 Capital, For Capital Adequacy Purposes, Amount $ 132,450 $ 128,421
Tier 1 Capital to risk-weighted assets, For Capital Adequacy Purposes, Ratio 6.00% 6.00%
Tier 1 Leverage, Actual, Amount $ 317,882 $ 332,468
Tier 1 Leverage to average assets, Actual, Ratio 13.02% 14.41%
Tier 1 Leverage, To Be Well Capitalized, Amount $ 122,046 $ 115,371
Tier 1 Leverage to average assets, To Be Well Capitalized, Ratio 5.00% 5.00%
Tier 1 Leverage, For Capital Adequacy Purposes, Amount $ 97,637 $ 92,297
Tier 1 Leverage to average assets, For Capital Adequacy Purposes, Ratio 4.00% 4.00%
Bank SNB [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
CET1 Capital, Actual, Amount $ 301,023 $ 291,125
CET1 Capital to risk-weighted assets, Actual, Ratio 13.66 13.65
CET1 Capital, To Be Well Capitalized, Amount $ 143,189 $ 138,637
CET1 Capital to risk-weighted assets, To Be Well Capitalized, Ratio 6.50 6.50
CET1 Capital, For Capital Adequacy Purposes, Amount $ 99,131 $ 95,980
CET1 Capital to risk-weighted assets, For Capital Adequacy Purposes, Ratio 4.50 4.50
Total Capital, Actual, Amount $ 328,681 $ 317,865
Total Capital to risk-weighted assets, Actual, Ratio 14.92% 14.90%
Total Capital, To Be Well Capitalized, Amount $ 220,291 $ 213,288
Total Capital to risk-weighted assets, To Be Well Capitalized, Ratio 10.00% 10.00%
Total Capital, For Capital Adequacy Purposes, Amount $ 176,232 $ 170,631
Total Capital to risk-weighted assets, For Capital Adequacy Purposes, Ratio 8.00% 8.00%
Tier 1 Capital, Actual, Amount $ 301,023 $ 291,125
Tier 1 Capital to risk-weighted assets, Actual, Ratio 13.66% 13.65%
Tier 1 Capital, To Be Well Capitalized, Amount $ 176,232 $ 170,631
Tier 1 Capital to risk-weighted assets, To Be Well Capitalized, Ratio 8.00% 8.00%
Tier 1 Capital, For Capital Adequacy Purposes, Amount $ 132,174 $ 127,973
Tier 1 Capital to risk-weighted assets, For Capital Adequacy Purposes, Ratio 6.00% 6.00%
Tier 1 Leverage, Actual, Amount $ 301,023 $ 291,125
Tier 1 Leverage to average assets, Actual, Ratio 12.37% 12.66%
Tier 1 Leverage, To Be Well Capitalized, Amount $ 121,686 $ 114,939
Tier 1 Leverage to average assets, To Be Well Capitalized, Ratio 5.00% 5.00%
Tier 1 Leverage, For Capital Adequacy Purposes, Amount $ 97,349 $ 91,951
Tier 1 Leverage to average assets, For Capital Adequacy Purposes, Ratio 4.00% 4.00%