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Federal Home Loan Bank Advances and Other Borrowings (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
bank
Dec. 31, 2016
USD ($)
Jan. 31, 2017
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 $ 2,900,000,000    
Additional available advances 677,000,000    
Aggregate principal balance of real estate loans used to collateralize FHLB advances 1,400,000,000    
Federal Home Loan Bank Stock 17,300,000    
Overnight FHLB advances 310,000,000 $ 278,000,000  
Maximum amount outstanding in respect of term advances 180,000,000 0  
Estimated fair value of MBS used to secure outstanding borrowings $ 27,300,000 $ 50,000,000  
Weighted average interest rate during the year 1.19% 0.59%  
Securities Sold under Agreements to Repurchase $ 28,500,000    
Reverse repurchase facility      
Federal Home Loan Bank Advances and Other Borrowings      
Estimated fair value of MBS used to secure outstanding borrowings $ 17,600,000    
Weighted average interest rate during the year 0.01%    
Securities Sold under Agreements to Repurchase $ 29,700,000    
Unsecured lines of credit      
Federal Home Loan Bank Advances and Other Borrowings      
Unused facility $ 168,000,000    
Number of correspondent banks | bank 8    
Amount outstanding $ 0 $ 0  
Federal Reserve discount window      
Federal Home Loan Bank Advances and Other Borrowings      
Unused facility 3,300,000    
Citigroup | Line of Credit      
Federal Home Loan Bank Advances and Other Borrowings      
Balance outstanding at end of year 18,500,000 18,500,000  
Barclays Bank | Line of Credit      
Federal Home Loan Bank Advances and Other Borrowings      
Balance outstanding at end of year 10,000,000 $ 10,000,000  
Union Bank | Reverse repurchase facility      
Federal Home Loan Bank Advances and Other Borrowings      
Unused facility 50,000,000    
Wells Fargo Bank | Line of Credit      
Federal Home Loan Bank Advances and Other Borrowings      
Unused facility     $ 15,000,000
Amount outstanding $ 0    
Minimum      
Federal Home Loan Bank Advances and Other Borrowings      
Term advances, rate 0.90%    
Maximum      
Federal Home Loan Bank Advances and Other Borrowings      
Term advances, rate 2.73%