Note 12 - Fair Value (Detail) - Recurring Fair Value Measurements (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012		Dec. 31, 2011
Trading securities:
Total trading securities	$ 16,031	[1]	$ 14,469	[1]
Securities available-for-sale:
Total securities available-for-sale	1,183,975		1,013,006
Fair Value, Inputs, Level 1 [Member]
Trading securities:
Money market funds	1,209		1,565
Mutual funds	14,822		12,904
Total trading securities	16,031		14,469
Securities available-for-sale:
Other equity securities	42		41
Total securities available-for-sale	42		41
Mortgage servicing rights (1)		[2]		[2]
Derivative liabilities (2)		[3]		[3]
Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale:
U.S. agency securities	5,011		5,035
CMOs	507,546		384,104
Other residential MBSs	136,001		87,691
Municipal securities	488,003		490,071
Corporate debt securities	30,733		30,014
Hedge fund investment	1,936		1,616
Other equity securities	1,018		1,040
Total securities available-for-sale	1,170,248		999,571
Mortgage servicing rights (1)		[2]		[2]
Derivative liabilities (2)	2,319	[3]	2,459	[3]
Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale:
CDOs	13,685		13,394
Total securities available-for-sale	13,685		13,394
Mortgage servicing rights (1)	878	[2]	929	[2]
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.