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Loans Receivable and Allowance for Loan Losses - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Transfer of securities from available-for-sale to held-to-maturity $ 1,900   $ 0 $ 103,680  
Proceeds from sales of loans receivable   $ 46,600 3,695 77,776  
Purchases of loans receivable     4,715 11,059  
Total past due 18,479   18,479   $ 17,618
Specific allowance for loan losses attributable to impaired loans 884   884   546
Impaired loans for which there are no related allowance for loan losses 11,951   11,951   14,611
Real estate loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Carrying value of servicing liability 443,500   443,500   478,800
Residential          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Purchases of loans receivable   $ 3,700 2,600 $ 11,100  
Commercial Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Purchases of loans receivable     2,100    
Real estate loans | Multifamily and commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total past due 130   130   1,847
Specific allowance for loan losses attributable to impaired loans 0   0   28
Impaired loans for which there are no related allowance for loan losses 2,717   2,717   2,058
Real estate loans | Residential          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total past due 13,526   13,526   11,669
Specific allowance for loan losses attributable to impaired loans 473   473   423
Impaired loans for which there are no related allowance for loan losses 6,629   6,629   8,870
Greater than 90 days          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total past due 3,927   3,927   6,525
Greater than 90 days | Real estate loans | Multifamily and commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total past due 0   0   1,329
Greater than 90 days | Real estate loans | Residential          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total past due $ 2,008   $ 2,008   $ 3,360