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Revenue Recognition (Narrative) (Details) | 3 Months Ended
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Mar. 31, 2018
Interest Income on Loans and Investment, Noninterest Revenue from Investment Security Gains, Loan Servicing, Gains on the Sale of Loans, Commitment Fees, and Fees from Financial Guarantees [Member] |
Percentage of total revenue | 94.20%

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Data Type: | na
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