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Cash and Cash Equivalents (Policy)	3 Months Ended
Cash and Cash Equivalents (Policy)	Mar. 31, 2017
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	Cash and due from banks, which represents vault cash in the retail offices and invested cash balances at the Federal Reserve and other correspondent banks, is carried at cost which approximates fair value.

Disclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents. Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value.

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