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Portfolio Loans - Narrative (Details) $ in Millions	Dec. 31, 2017 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans over 90 days past due and still accruing interest | loan	0
Specific reserves on restructured loans	$ 0.0
Unadvanced Commitment on Impaired Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Estimated losses attributable to unadvanced commitments on impaired loans	$ 0.4

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- Definition

Financing Receivable Modifications Reserve

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- Definition

Financing Receivable Recorded Investment 90 Days Past Due And Still Accruing Number of Loans

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- Definition

Loans and Leases Receivable, Impaired Loans, Commitment to Lend, Reserve

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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