Loans And Allowance For Loan Losses (Southwest's Loan Classifications) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 1,367,388	$ 1,270,903
Less: Allowance for loan losses	(30,917)	(36,663)
Total loans, net	1,336,471	1,234,240
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	330,738	255,058
Commercial Real Estate [Member] | Real Estate Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	757,878	752,279
Commercial Real Estate [Member] | Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	166,379	143,848
One-To-Four Family Residential [Member] | Real Estate Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	78,985	83,988
One-To-Four Family Residential [Member] | Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	11,030	4,646
Guaranteed Student Loans [Member] | Installment And Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	127	4,394
Other [Member] | Installment And Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 22,251	$ 26,690