Note 12 - Fair Value (Detail) - Recurring Fair Value Measurements (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011
Trading securities:
Total trading securities	$ 15,314	[1]	$ 14,469	[1]
Securities available-for-sale:
Total securities available- for-sale	1,174,931		1,013,006
Fair Value, Inputs, Level 1 [Member]
Trading securities:
Money market funds	1,293		1,565
Mutual funds	14,021		12,904
Total trading securities	15,314		14,469
Securities available-for-sale:
Other equity securities	42		41
Total securities available- for-sale	42		41
Mortgage servicing rights (1)		[2]		[2]
Liabilities:
Derivative liabilities (2)		[3]		[3]
Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale:
U.S. agency securities	2,006		5,035
CMOs	489,047		384,104
Other residential MBSs	135,927		87,691
Municipal securities	504,693		490,071
Corporate debt securities	21,701		30,014
Hedge fund investment	2,033		1,616
Other equity securities	8,400		1,040
Total securities available- for-sale	1,163,807		999,571
Mortgage servicing rights (1)		[2]		[2]
Liabilities:
Derivative liabilities (2)	2,466	[3]	2,459	[3]
Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale:
CDOs	11,082		13,394
Total securities available- for-sale	11,082		13,394
Mortgage servicing rights (1)	836	[2]	929	[2]
Liabilities:
Derivative liabilities (2)		[3]		[3]

[1] Trading securities held by the Company represent diversified investment securities held in a grantor trust under deferred compensation arrangements in which plan participants may direct amounts earned to be invested in securities other than Company stock.

[2] Included in other assets in the Consolidated Statements of Financial Condition.

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