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Loans Receivable and Allowance for Credit Losses (Loans Receivable Narrative) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Loans in process of foreclosure    
Other real estate owned, net $ 748 $ 830
Residential real estate properties    
Loans in process of foreclosure    
Carrying amount of foreclosed residential real estate properties included in total net OREO 615 188
Single-family residential and home equity line of credit    
Loans in process of foreclosure    
Recorded investment in consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings were in process 2,500 6,600
PCI Loans    
Nonaccrual loans    
Loans on nonaccrual status $ 4,900 $ 5,300