Statement of Condition (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Assets
Held-to-maturity Securities, Fair Value	$ 6,416,070	$ 8,782,348
Loans and Leases Receivable, Allowance	14,058	14,344
Other Assets Banking on Business Loans Federal Home Loan Banks Allowance	$ 2,504	$ 3,223
Capital
Common Stock, par value	$ 100	$ 100
Common Stock, shares outstanding	30,917	33,899