Note 20 - Commitments, Guarantees, and Contingent Liabilities (Detail) - Contractual or Notional Amounts of Financial Instruments (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Commitments to extend credit:
Home equity lines	$ 257,315		$ 275,826
Credit card lines	21,257		26,376
1-4 family real estate construction	13,300		26,682
Commercial real estate	139,574		175,608
All other	58,532		74,594
Total letters of credit	116,566		140,041
Unamortized fees associated with letters of credit (2) (3)	668	[1],[2]	696	[1],[2]
Remaining weighted-average term, in months	9.62		12.2
Remaining lives, in years	0.1 to 12.6		0.1 to 9.5
Commercial and industrial	609,601		553,168
Overdraft protection program (1)	178,699	[3]	169,824	[3]
All other commitments	129,015		97,299
Total commitments	1,348,761		1,324,783
Recourse on assets securitized:
Unpaid principal balance of assets securitized			7,424
Cap on recourse obligation			2,208
Carrying value of recourse obligation (2)		[1]	148	[1]
Family Real Estate Construction Letters Of Credit [Member]
Commitments to extend credit:
1-4 family real estate construction	8,661		10,551
Commercial Real Estate Letters Of Credit [Member]
Commitments to extend credit:
Commercial real estate	$ 49,373		$ 54,896

[1] Included in other liabilities in the Consolidated Statements of Financial Condition.

[2] The Company is amortizing these amounts into income over the commitment period.

[3] Federal regulation regarding electronic fund transfers require customers to affirmatively consent to the institution's overdraft service for automated teller machine and one-time debit card transactions before overdraft fees may be assessed on the account. Customers are provided a specific line for the amount they may overdraw.