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Borrowed Funds (Subordinated Debentures Owed to Unconsolidated Subsidiary Trusts) (Narrative) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
trust
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
[1]
Debt Instrument [Line Items]      
Number of statutory business trusts | trust 3    
Subordinated debentures owed to unconsolidated subsidiary trusts $ 19,589   $ 19,589
Net proceeds from issuance of common stock $ 126 $ (90)  
Trust preferred securities limited to tier one capital elements, net of goodwill 25.00%    
[1] Derived from audited consolidated financial statements