Note 17 - Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2013

Fair Value Disclosures [Abstract]

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

	As of December 31, 2013				As of December 31, 2012
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(In thousands)
Financial Assets
Cash and due from banks	$	153,747	$	153,747	$	144,909	$	144,909
Short-term investments		516,938		516,938		411,983		411,983
Securities held-to-maturity		-		-		773,768		823,906
Securities available-for-sale		1,586,668		1,586,668		1,291,480		1,291,480
Trading securities		4,936		4,936		4,703		4,703
Loans, net		7,897,187		7,760,490		7,235,587		7,169,732
Investment in Federal Home Loan Bank stock		25,000		25,000		41,272		41,272
Warrants		30		30		104		104

	Notional Amount		Fair Value		Notional Amount		Fair Value
Option contracts	$	200	$	0	$	105	$	-
Foreign exchange contracts		267,644		6,182		188,145		2,924

	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Financial Liabilities
Deposits	$	7,981,305	$	7,977,639	$	7,383,225	$	7,389,015
Securities sold under agreement to repurchase		800,000		852,835		1,250,000		1,361,585
Advances from Federal Home Loan Bank		521,200		521,560		146,200		146,789
Other borrowings		19,062		16,107		18,713		14,573
Long-term debt		121,136		58,970		171,136		98,392

	Notional Amount		Fair Value		Notional Amount		Fair Value
Option contracts	$	-	$	-	$	104	$	2
Foreign exchange contracts		236,350		6,140		133,669		1,586

	Notional Amount		Fair Value			Notional Amount		Fair Value
Off-Balance Sheet Financial Instruments
Commitments to extend credit	$	1,858,669	$	(2,187	)	$	1,740,463	$	(1,875	)
Standby letters of credit		45,058		(205	)		44,672		(204	)
Other letters of credit		54,098		(34	)		71,073		(34	)
Bill of lading guarantees		80		-			77		-

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

	As of December 31, 2013
	Estimated Fair Value Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	153,747	$	153,747	$	-	$	-
Short-term investments		516,938		516,938		-		-
Securities available-for-sale		1,586,668		465,917		1,120,751		-
Trading securities		4,936		-		4,936		-
Loans, net		7,760,490		-		-		7,760,490
Investment in Federal Home Loan Bank stock		25,000		-		25,000		-
Warrants		30		-		-		30
Financial Liabilities
Deposits		7,977,639		-		-		7,977,639
Securities sold under agreement to repurchase		852,835		-		852,835		-
Advances from Federal Home Loan Bank		521,560		-		521,560		-
Other borrowings		16,107		-		-		16,107
Long-term debt		58,970		-		58,970		-

	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		-