Note 12 - Fair Value (Detail) - Fair Value Measurements (USD $) In Thousands	Jun. 30, 2011		Dec. 31, 2010
Trading securities:
Total trading securities	$ 16,230	[1]	$ 15,282	[1]
Securities available-for-sale:
Total securities available-for-sale	1,009,873		1,057,802
Liabilities:
Derivative liabilities	1,877		1,833
Level1 [Member]
Trading securities:
Money market funds	1,152		1,196
Mutual funds	15,078		14,086
Total trading securities	16,230		15,282
Securities available-for-sale:
Other equity securities	39		38
Total securities available-for-sale	39		38
Mortgage servicing rights		[2]		[2]
Total assets recurring	16,269		15,320
Liabilities:
Derivative liabilities		[2]		[2]
Assets measured at fair value on a non-recurring basis
Collateral-dependent impaired loans		[3]		[3]
Other real estate owned		[4]		[4]
Loan held-for-sale (4)		[5]
Asset held-for-sale (5)		[6]
Level2 [Member]
Securities available-for-sale:
U.S. agency securities	8,113		17,886
Collateralized residential mortgage obligations	376,702		379,589
Other residential mortgage-backed securities	97,805		106,451
State and municipal securities	479,919		503,991
Corporate debt securities	27,922		32,345
Hedge fund investment	1,882		1,683
Other equity securities	1,004		961
Total securities available-for-sale	993,347		1,042,906
Mortgage servicing rights		[2]		[2]
Total assets recurring	993,347		1,042,906
Liabilities:
Derivative liabilities	1,877	[2]	1,833	[2]
Assets measured at fair value on a non-recurring basis
Collateral-dependent impaired loans		[3]		[3]
Other real estate owned		[4]		[4]
Loan held-for-sale (4)		[5]
Asset held-for-sale (5)		[6]
Level3 [Member]
Securities available-for-sale:
Collateralized debt obligations	16,487		14,858
Total securities available-for-sale	16,487		14,858
Mortgage servicing rights	840	[2]	942	[2]
Total assets recurring	17,327		15,800
Liabilities:
Derivative liabilities		[2]		[2]
Assets measured at fair value on a non-recurring basis
Collateral-dependent impaired loans	85,101	[3]	125,258	[3]
Other real estate owned	38,990	[4]	53,439	[4]
Loan held-for-sale (4)	1,595	[5]
Asset held-for-sale (5)	7,928	[6]
Total assets non-recurring	133,614		178,697
Total [Member]
Trading securities:
Money market funds	1,152		1,196
Mutual funds	15,078		14,086
Total trading securities	16,230		15,282
Securities available-for-sale:
U.S. agency securities	8,113		17,886
Collateralized residential mortgage obligations	376,702		379,589
Other residential mortgage-backed securities	97,805		106,451
State and municipal securities	479,919		503,991
Collateralized debt obligations	16,487		14,858
Corporate debt securities	27,922		32,345
Hedge fund investment	1,882		1,683
Other equity securities	1,043		999
Total securities available-for-sale	1,009,873		1,057,802
Mortgage servicing rights	840	[2]	942	[2]
Total assets recurring	1,026,943		1,074,026
Liabilities:
Derivative liabilities	1,877	[2]	1,833	[2]
Assets measured at fair value on a non-recurring basis
Collateral-dependent impaired loans	85,101	[3]	125,258	[3]
Other real estate owned	38,990	[4]	53,439	[4]
Loan held-for-sale (4)	1,595	[5]
Asset held-for-sale (5)	7,928	[6]
Total assets non-recurring	$ 133,614		$ 178,697

[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] Mortgage servicing rights are included in other assets, and derivative liabilities are included in other liabilities in the Consolidated Statements of Financial Condition.

[3] Represents the carrying value of loans for which adjustments are based on the appraised or market-quoted value of the collateral, net of selling costs. Collateral-dependent loans for which no fair value adjustments were necessary during the six months ended June 30, 2011 are not included.

[4] Represents the estimated fair value, net of selling costs, based on appraised value and includes covered OREO.

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

[6] Included in premises, furniture, and equipment in the Consolidated Statements of Condition.