Note 22 - Fair Value (Detail) - Financial Instruments (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Financial Assets:
Cash and due from banks	$ 123,354		$ 102,495
Interest-bearing deposits in other banks	518,176		483,281
Trading securities	14,469		15,282
Securities available-for-sale	1,013,006		1,057,802
Securities held-to-maturity	60,458		81,320
Loans, net of allowance for loan losses	5,229,153		5,329,717
FDIC indemnification asset	65,609		95,899		67,945
Accrued interest receivable	29,826		29,953
Investment in bank-owned life insurance	206,235		197,644
Financial Liabilities:
Deposits	6,479,175		6,511,476
Borrowed funds	205,371		303,974
Senior and subordinated debt	252,153		137,744
Derivative liabilities	2,459	[1]	1,833	[1]
Carrying Amount [Member]
Financial Assets:
Cash and due from banks	123,354		102,495
Interest-bearing deposits in other banks	518,176		483,281
Loans held-for-sale	4,200		236
Trading securities	14,469		15,282
Securities available-for-sale	1,013,006		1,057,802
Securities held-to-maturity	60,458		81,320
Loans, net of allowance for loan losses	5,229,153		5,329,717
FDIC indemnification asset	65,609		95,899
Accrued interest receivable	29,826		29,953
Investment in bank-owned life insurance	206,235		197,644
Financial Liabilities:
Deposits	6,479,175		6,511,476
Borrowed funds	205,371		303,974
Senior and subordinated debt	252,153		137,744
Accrued interest payable	4,019		4,557
Derivative liabilities	2,459		1,833
Standby letters of credit	668		696
Fair Value [Member]
Financial Assets:
Cash and due from banks	123,354		102,495
Interest-bearing deposits in other banks	518,176		483,281
Loans held-for-sale	4,200		236
Trading securities	14,469		15,282
Securities available-for-sale	1,013,006		1,057,802
Securities held-to-maturity	61,477		82,525
Loans, net of allowance for loan losses	5,224,254		5,323,830
FDIC indemnification asset	65,609		95,899
Accrued interest receivable	29,826		29,953
Investment in bank-owned life insurance	206,235		197,644
Financial Liabilities:
Deposits	6,479,309		6,512,626
Borrowed funds	208,728		306,703
Senior and subordinated debt	237,393		122,261
Accrued interest payable	4,019		4,557
Derivative liabilities	2,459		1,833
Standby letters of credit	$ 668		$ 696

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