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Borrowings and Related Interest(Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]            
Other borrowings $ 192   $ 192     $ 153
Subordinated Debt 36,083   36,083     36,083
Gains Losses On Extinguishment Of Debt 0 $ 0 0 $ (80)    
Federal Home Loan Bank Advances [Member]            
Debt Instrument [Line Items]            
Loans pledged as collateral to secure FHLB advances 905,300   905,300     1,300,000
Additional Borrowing Capacity $ 830,700   830,700     920,000
Weighted average period remaining maturity of FHLB advances 26.2 months       3.2 months  
Interest Payable $ 153   $ 153      
Minimum amount of qualifying collateral 110.00%   110.00%      
Repurchase agreement            
Debt Instrument [Line Items]            
Interest Payable $ 429   $ 429     $ 369