Note 11 - Fair Value (Detail) - Fair Value Measurements (USD $) In Thousands	Sep. 30, 2011		Dec. 31, 2010
Trading securities:
Total trading securities	$ 13,308	[1]	$ 15,282	[1]
Securities available-for-sale:
Total securities available-for-sale	970,430		1,057,802
Level 1 [Member]
Trading securities:
Money market funds	1,113		1,196
Mutual funds	12,195		14,086
Total trading securities	13,308		15,282
Securities available-for-sale:
Other equity securities	41		38
Total securities available-for-sale	41		38
Mortgage servicing rights		[2]		[2]
Total assets recurring	13,349		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]
Assets held-for-sale (4)		[5]
Level 2 [Member]
Securities available-for-sale:
U.S. agency securities	5,103		17,886
Collateralized residential mortgage obligations	337,448		379,589
Other residential mortgage-backed securities	98,387		106,451
State and municipal securities	484,950		503,991
Corporate debt securities	27,666		32,345
Hedge fund investment	1,620		1,683
Other equity securities	998		961
Total securities available-for-sale	956,172		1,042,906
Mortgage servicing rights		[2]		[2]
Total assets recurring	956,172		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]
Assets held-for-sale (4)		[5]
Level 3 [Member]
Securities available-for-sale:
Collateralized debt obligations	14,217		14,858
Total securities available-for-sale	14,217		14,858
Mortgage servicing rights	932	[2]	942	[2]
Total assets recurring	15,149		15,800
Liabilities:
Derivative liabilities		[2]		[2]
Assets measured at fair value on a non-recurring basis
Collateral-dependent impaired loans	80,395	[3]	125,258	[3]
Other real estate owned	45,457	[4]	53,439	[4]
Loans held-for-sale	4,620
Assets held-for-sale (4)	7,945	[5]
Total assets non-recurring	138,417		178,697
Total [Member]
Trading securities:
Money market funds	1,113		1,196
Mutual funds	12,195		14,086
Total trading securities	13,308		15,282
Securities available-for-sale:
U.S. agency securities	5,103		17,886
Collateralized residential mortgage obligations	337,448		379,589
Other residential mortgage-backed securities	98,387		106,451
State and municipal securities	484,950		503,991
Collateralized debt obligations	14,217		14,858
Corporate debt securities	27,666		32,345
Hedge fund investment	1,620		1,683
Other equity securities	1,039		999
Total securities available-for-sale	970,430		1,057,802
Mortgage servicing rights	932	[2]	942
Total assets recurring	984,670		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	80,395	[3]	125,258	[3]
Other real estate owned	45,457	[4]	53,439	[4]
Loans held-for-sale	4,620
Assets held-for-sale (4)	7,945	[5]
Total assets non-recurring	$ 138,417		$ 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 nine months ended September 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 premises, furniture, and equipment in the Consolidated Statements of Financial Condition.