Note 10 - Borrowed Funds (Detail) - Unused Short-Term Credit Lines Available for Use (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Available federal funds lines (1)	$ 500,600	[1]	$ 528,000	[1]
Federal Reserve Bank’s Discount Window primary credit program	$ 1,625,826		$ 1,460,313

[1] Subject to the liquidity position of other banks.