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Borrowings and Related Interest (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]          
Subordinated Debt $ 36,083   $ 36,083   $ 36,083
Gains Losses On Extinguishment Of Debt (7) $ 0 (7) $ 0  
Securities sold under agreements to repurchase 240,324   240,324   455,508
Investment securities available-for-sale 191,200   354,501 $ 0  
Collateralized Mortgage Backed Securities [Member]          
Debt Instrument [Line Items]          
Securities sold under agreements to repurchase 349,700   349,700    
Federal Home Loan Bank Advances [Member]          
Debt Instrument [Line Items]          
Loans pledged as collateral to secure FHLB advances 864,700   864,700   847,300
Additional Borrowing Capacity 784,800   $ 784,800   $ 762,000
Weighted average period remaining maturity of FHLB advances     26 months   26 months 18 days
Interest payable $ 180   $ 180   $ 176
Minimum amount of qualifying collateral 110.00%   110.00%    
Repurchase agreement          
Debt Instrument [Line Items]          
Interest payable $ 324   $ 324   $ 785