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Borrowings and Related Interest(Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]            
Other borrowings $ 299   $ 299     $ 153
Subordinated Debt 36,083   36,083     36,083
Gains Losses On Extinguishment Of Debt 0 $ (80) 0 $ (80)    
Federal Home Loan Bank Advances [Member]            
Debt Instrument [Line Items]            
Loans pledged as collateral to secure FHLB advances 910,700   910,700     1,300,000
Additional Borrowing Capacity $ 775,600   775,600     920,000
Weighted average period remaining maturity of FHLB advances 8.4 months       3.2 months  
Interest Payable $ 123   $ 123      
Minimum amount of qualifying collateral 110.00%   110.00%      
Repurchase agreement            
Debt Instrument [Line Items]            
Interest Payable $ 391   $ 391     $ 369