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Loans Receivable - Nonaccrual Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross nonaccrual loans $ 10,703 $ 10,909
Nonaccrual originated loans guaranteed by governmental agencies 1,900 2,800
Commercial business    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross nonaccrual loans 9,098 8,580
Commercial business | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross nonaccrual loans 3,110 3,531
Commercial business | Owner-occupied commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross nonaccrual loans 4,090 3,728
Commercial business | Non-owner occupied commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross nonaccrual loans 1,898 1,321
One-to-four family residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross nonaccrual loans 81 94
Real estate construction and land development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross nonaccrual loans 1,247 2,008
Real estate construction and land development | One-to-four family residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross nonaccrual loans 1,247 2,008
Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross nonaccrual loans $ 277 $ 227