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Subordinated Debentures, Notes, And Other Borrowings (Repurchase Agreements Accounted for as Secured Borrowings) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements and repurchase-to-maturity transactions $ 10,717 $ 12,023
Gross amount of recognized liabilities for repurchase agreements in statement of condition 10,717 12,023
Maturity Overnight and Continuous [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements and repurchase-to-maturity transactions 10,717 12,023
Gross amount of recognized liabilities for repurchase agreements in statement of condition $ 10,717 $ 12,023