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Federal Home Loan Bank Advances and Other Borrowings (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
bank
Dec. 31, 2017
USD ($)
Jun. 30, 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 $ 5,180,000,000    
Additional available advances 1,784,000,000    
Aggregate principal balance of real estate loans used to collateralize FHLB advances 3,300,000,000    
FHLB stock 19,600,000    
Overnight FHLB advances 506,000,000 $ 310,000,000  
Maximum amount outstanding in respect of term advances $ 161,500,000 180,000,000  
Fair value of securities pledged as collateral for the Bank's inverse putable reverse repurchases   $ 27,300,000  
Weighted average interest rate during the year 2.51% 1.19%  
Average balance of repurchase agreement facilities $ 15,000,000    
Reverse repurchase facility      
Federal Home Loan Bank Advances and Other Borrowings      
Estimated fair value of MBS used to secure outstanding borrowings $ 75,000    
Weighted average interest rate during the year 0.01%    
Investment securities, fair value $ 20,900,000    
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  
Barclays Bank | Line of Credit      
Federal Home Loan Bank Advances and Other Borrowings      
Balance outstanding at end of year   10,000,000  
Union Bank | Reverse repurchase facility      
Federal Home Loan Bank Advances and Other Borrowings      
Unused facility 50,000,000 50,000,000.0  
Wells Fargo Bank | Line of Credit      
Federal Home Loan Bank Advances and Other Borrowings      
Unused facility     $ 15,000,000
Amount outstanding $ 0 $ 0  
Minimum      
Federal Home Loan Bank Advances and Other Borrowings      
Term advances, rate 1.53%    
Maximum      
Federal Home Loan Bank Advances and Other Borrowings      
Term advances, rate 2.73%