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Loans And Allowance For Loan Losses (Southwest's Loan Classifications) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable $ 1,971,634 $ 1,877,132
Less: Allowance for loan losses (27,318) (27,546)
Total loans, net 1,944,316 1,849,586
Less: Loans held for sale (included above) (6,036) (4,386)
Net loans receivable 1,938,280 1,845,200
Real Estate Mortgage [Member] | Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 961,085 882,071
Real Estate Mortgage [Member] | Residential Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 241,140 199,123
Commercial Real Estate [Member] | Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 554,094 556,248
Construction Loans [Member] | Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 182,620 199,113
Construction Loans [Member] | Residential Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 14,523 20,946
Installment And Consumer [Member] | Consumer Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable $ 18,172 $ 19,631