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Federal Home Loan Bank Advances and Other Borrowings (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
bank
Dec. 31, 2015
USD ($)
Jan. 31, 2016
USD ($)
Federal Home Loan Bank Advances and Other Borrowings      
Maximum percentage of assets up to which advances will be provided by FHLB 45.00%    
Maximum credit line available from FHLB $ 1,700,000,000    
Additional available advances 741,000,000    
Aggregate principal balance of real estate loans used to collateralize FHLB advances 1,200,000,000    
Federal Home Loan Bank Stock 14,400,000    
Overnight FHLB advances 278,000,000 $ 98,000,000  
Maximum amount outstanding in respect of term advances 0 50,000,000  
FHLB advances 278,000,000 148,000,000  
Estimated fair value of MBS used to secure outstanding borrowings $ 33,400,000.0 $ 50,000,000  
Weighted average rate for securities sold under agreement to repurchase (as a percent) 0.59% 0.39%  
Securities Sold under Agreements to Repurchase $ 28,500,000    
Line of Credit | Citigroup      
Federal Home Loan Bank Advances and Other Borrowings      
Balance outstanding at end of year 18,500,000 $ 18,500,000  
Line of Credit | Barclays Bank      
Federal Home Loan Bank Advances and Other Borrowings      
Balance outstanding at end of year 10,000,000 10,000,000  
Reverse repurchase facility      
Federal Home Loan Bank Advances and Other Borrowings      
Estimated fair value of MBS used to secure outstanding borrowings $ 21,500,000    
Weighted average rate for securities sold under agreement to repurchase (as a percent) 0.02%    
Securities Sold under Agreements to Repurchase $ 31,900,000    
Reverse repurchase facility | Union Bank      
Federal Home Loan Bank Advances and Other Borrowings      
Unused facility 50,000,000    
Unsecured lines of credit      
Federal Home Loan Bank Advances and Other Borrowings      
Unused facility $ 123,000,000    
Number of correspondent banks | bank 7    
Amount outstanding $ 0 $ 0  
Federal Reserve discount window      
Federal Home Loan Bank Advances and Other Borrowings      
Unused facility 3,300,000    
Line of Credit | U.S. Bank      
Federal Home Loan Bank Advances and Other Borrowings      
Unused facility     $ 15,000,000
Amount outstanding $ 0