Note 22 - Fair Value (Detail) - Fair Value Measurements (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Trading securities:
Money market funds	$ 1,565		$ 1,196
Mutual funds	12,904		14,086
Total trading securities	14,469		15,282
Securities available-for-sale:
U.S. agency securities	5,035		17,886
CMOs	384,104		379,589
Other residential mortgage-backed securities	87,691		106,451
Municipal securities	490,071		503,991
CDOs	13,394		14,858
Corporate debt securities	30,014		32,345
Hedge fund investment	1,616		1,683
Other equity securities	1,081		999
Total securities available-for-sale	1,013,006		1,057,802
Mortgage servicing rights (1)	929	[1]	942
Total assets recurring	1,028,404		1,074,026
Liabilities:
Derivative liabilities	2,459	[1]	1,833	[1]
Pension plan assets:
Pension Plan Assets	62,990		54,713		51,033
Assets measured at fair value on a non-recurring basis
Collateral-dependent impaired loans	96,220	[2]	125,258	[2]
OREO (4)	57,430	[3]	53,439	[3]
Loans held-for-sale (5)	4,200	[4]
Assets held-for-sale (6)	7,933	[5]
Total assets non-recurring	165,783		178,697
Level 1 [Member] | Mutual Funds [Member]
Pension plan assets:
Pension Plan Assets	17,970	[6]	8,995	[6]
Level 1 [Member] | US Government and Government Agencies and Authorities [Member]
Pension plan assets:
Pension Plan Assets	5,954		2,670
Level 1 [Member] | Equity Securities, Investment Summary [Member]
Pension plan assets:
Pension Plan Assets	16,537		16,155
Level 1 [Member] | Total [Member]
Pension plan assets:
Pension Plan Assets	40,461		27,820
Level 1 [Member]
Trading securities:
Money market funds	1,565		1,196
Mutual funds	12,904		14,086
Total trading securities	14,469		15,282
Securities available-for-sale:
Other equity securities	41		38
Total securities available-for-sale	41		38
Mortgage servicing rights (1)		[1]		[1]
Total assets recurring	14,510		15,320
Liabilities:
Derivative liabilities		[1]		[1]
Assets measured at fair value on a non-recurring basis
Collateral-dependent impaired loans		[2]		[2]
OREO (4)		[3]		[3]
Loans held-for-sale (5)		[4]
Assets held-for-sale (6)		[5]
Level 2 [Member] | Mutual Funds [Member]
Pension plan assets:
Pension Plan Assets		[6]		[6]
Level 2 [Member] | US Government and Government Agencies and Authorities [Member]
Pension plan assets:
Pension Plan Assets	7,029		4,950
Level 2 [Member] | All Other Corporate Bonds [Member]
Pension plan assets:
Pension Plan Assets	5,954		10,500
Level 2 [Member] | Common Trust Funds [Member]
Pension plan assets:
Pension Plan Assets	9,546		11,443
Level 2 [Member] | Total [Member]
Pension plan assets:
Pension Plan Assets	22,529		26,893
Level 2 [Member]
Securities available-for-sale:
U.S. agency securities	5,035		17,886
CMOs	384,104		379,589
Other residential mortgage-backed securities	87,691		106,451
Municipal securities	490,071		503,991
Corporate debt securities	30,014		32,345
Hedge fund investment	1,616		1,683
Other equity securities	1,040		961
Total securities available-for-sale	999,571		1,042,906
Mortgage servicing rights (1)		[1]		[1]
Total assets recurring	999,571		1,042,906
Liabilities:
Derivative liabilities	2,459	[1]	1,833	[1]
Assets measured at fair value on a non-recurring basis
Collateral-dependent impaired loans		[2]		[2]
OREO (4)		[3]		[3]
Loans held-for-sale (5)		[4]
Assets held-for-sale (6)		[5]
Level 3 [Member] | Mutual Funds [Member]
Pension plan assets:
Pension Plan Assets		[6]		[6]
Level 3 [Member]
Securities available-for-sale:
CDOs	13,394		14,858
Other equity securities			0
Total securities available-for-sale	13,394		14,858
Mortgage servicing rights (1)	929	[1]	942	[1]
Total assets recurring	14,323		15,800
Liabilities:
Derivative liabilities		[1]		[1]
Assets measured at fair value on a non-recurring basis
Collateral-dependent impaired loans	96,220	[2]	125,258	[2]
OREO (4)	57,430	[3]	53,439	[3]
Loans held-for-sale (5)	4,200	[4]
Assets held-for-sale (6)	7,933	[5]
Total assets non-recurring	165,783		178,697
Mutual Funds [Member]
Pension plan assets:
Pension Plan Assets	17,970	[6]	8,995	[6]
US Government and Government Agencies and Authorities [Member]
Pension plan assets:
Pension Plan Assets	12,983		7,620
All Other Corporate Bonds [Member]
Pension plan assets:
Pension Plan Assets	5,954		10,500
Equity Securities, Investment Summary [Member]
Pension plan assets:
Pension Plan Assets	16,537		16,155
Common Trust Funds [Member]
Pension plan assets:
Pension Plan Assets	9,546		11,443
Total [Member]
Pension plan assets:
Pension Plan Assets	$ 62,990		$ 54,713

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

[2] 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 year ended December 31, 2011 are not included.

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

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

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

[6] Includes mutual funds, money market funds, cash, cash equivalents, and accrued interest.