Note 17 - Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2012

Fair Value, by Balance Sheet Grouping [Table Text Block]

	As of December 31, 2012				As of December 31, 2011
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(In thousands)
Financial Assets
Cash and due from banks	$	144,909	$	144,909	$	117,888	$	117,888
Short-term investments		411,983		411,983		294,956		294,956
Securities held-to-maturity		773,768		823,906		1,153,504		1,203,977
Securities available-for-sale		1,291,480		1,291,480		1,294,478		1,294,478
Trading securities		4,703		4,703		4,542		4,542
Loans held-for-sale		-		-		760		760
Loans, net		7,235,587		7,169,732		6,844,483		6,825,571
Investment in Federal Home Loan Bank stock		41,272		41,272		52,989		52,989
Warrants		104		104		218		218

	Notional Amount		Fair Value		Notional Amount		Fair Value
Option contracts	$	105	$	-	$	3,026	$	34
Foreign exchange contracts		188,145		2,924		238,581		2,151

Financial Liabilities	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Deposits	$	7,383,225	$	7,389,015	$	7,229,131	$	7,240,857
Securities sold under agreement to repurchase		1,250,000		1,361,585		1,400,000		1,547,900
Advances from Federal Home Loan Bank		146,200		146,789		225,000		227,825
Other borrowings		18,713		14,573		19,800		19,801
Long-term debt		171,136		98,392		171,136		98,676

	Notional Amount		Fair Value		Notional Amount		Fair Value
Option contracts	$	104	$	2	$	1,282	$	5
Interest rate swaps		-		-		300,000		2,634
Foreign exchange contracts		133,669		1,586		128,215		486

	Notional Amount		Fair Value			Notional Amount		Fair Value
Off-Balance Sheet Financial Instruments
Commitments to extend credit	$	1,740,463	$	(1,875	)	$	1,626,523	$	(1,253	)
Standby letters of credit		44,672		(204	)		62,076		(367	)
Other letters of credit		71,073		(34	)		64,233		(38	)
Bill of lading guarantees		77		-			187		-

Schedule of Fair Value of Financial Instruments [Table Text Block]

	As of December 31, 2012
	Estimated Fair Value Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	144,909	$	144,909	$	-	$	-
Short-term investments		411,983		411,983		-		-
Securities held-to-maturity		823,906		-		823,906		-
Securities available-for-sale		1,291,480		526,165		765,315		-
Trading securities		4,703		-		4,703		-
Loans, net		7,169,732		-		-		7,169,732
Investment in Federal Home Loan Bank stock		41,272		-		41,272		-
Warrants		104		-		-		104
Financial Liabilities
Deposits		7,389,015		-		-		7,389,015
Securities sold under agreement to repurchase		1,361,585		-		1,361,585		-
Advances from Federal Home Loan Bank		146,789		-		146,789		-
Other borrowings		14,573		-		-		14,573
Long-term debt		98,392		-		98,392		-

	As of December 31, 2011
	Estimated Fair Value Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	117,888	$	117,888	$	-	$	-
Short-term investments		294,956		294,956		-		-
Securities held-to-maturity		1,203,977		-		1,203,977		-
Securities available-for-sale		1,294,478		54,958		1,239,520		-
Trading securities		4,542		2		4,540		-
Loans held-for-sale		760		-		760		.
Loans, net		6,825,571		-		-		6,825,571
Investment in Federal Home Loan Bank stock		52,989		-		52,989		-
Warrants		218		-		-		218
Financial Liabilities
Deposits		7,240,857		-		-		7,240,857
Securities sold under agreement to repurchase		1,547,900		-		1,547,900		-
Advances from Federal Home Loan Bank		227,825		-		227,825		-
Other borrowings		19,801		-		-		19,801
Long-term debt		98,676		-		98,676		-