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Loans (Narrative) (Details) - USD ($)
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of Loans Considered Current 0.00% 0.00%   0.00%
Loans and leases receivable, impaired, commitment to lend $ 0      
Residential real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Pledged assets separately reported, loans pledged as collateral, at fair value 585,600,000   $ 487,200,000  
Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Pledged assets separately reported, loans pledged as collateral, at fair value $ 69,800,000   $ 74,000,000