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Loan Portfolio and Credit Quality Loans Text Disclosures (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 90 days past due and still accruing $ 0 $ 0
Loans pledged in agreement with Federal Home Loan Bank 2,600,000,000 2,500,000,000
Loans pledged as collateral at Federal Reserve Bank 540,000,000 572,100,000
Loans classified as TDRs 8,000,000 13,600,000
Commitment to lend 0 0
Deferred loan origination (fees)/costs, net 8,500,000 6,900,000
Performing Financial Instruments [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans classified as TDRs $ 3,800,000 $ 11,100,000