Cash and Due from Banks	12 Months Ended
Cash and Due from Banks	Dec. 31, 2016
Cash and Due from Banks [Abstract]
Cash and Due from Banks	Cash and Due from Banks Cash and due from banks on the Statement of Condition includes cash on hand, cash items in the process of collection, compensating balances, and amounts due from correspondent banks and the Federal Reserve Bank (FRB). The Bank maintains compensating and collected cash balances with commercial banks in return for certain services. These agreements contain no legal restrictions about the withdrawal of funds. The average compensating and collected cash balances for the years ended December 31, 2016 and 2015 were $296.0 million and $298.8 million, respectively. Pass-through Deposit Reserves. The Bank acts as a pass-through correspondent for member institutions required to deposit reserves with the FRBs. The amount shown as cash and due from banks includes pass-through reserves deposited with FRBs of $33.1 million and $22.4 million as of December 31, 2016 and December 31, 2015, respectively. The Bank includes member reserve balances in noninterest-bearing deposits within liabilities on the Statement of Condition.

The entire disclosure for cash and cash equivalent footnotes, which may include the types of deposits and money market instruments, applicable carrying amounts, restricted amounts and compensating balance arrangements. Cash and equivalents include: (1) currency on hand (2) demand deposits with banks or financial institutions (3) other kinds of accounts that have the general characteristics of demand deposits (4) short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments maturing within three months from the date of acquisition qualify.