Note 12 - Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2014

Fair Value Disclosures [Abstract]

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

	March 31, 2014				December 31, 2013
	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
	(In thousands)
Financial Assets
Cash and due from banks	$	161,657	$	161,657	$	153,747	$	153,747
Short-term investments		620,306		620,306		516,938		516,938
Securities available-for-sale		1,578,897		1,578,897		1,586,668		1,586,668
Trading securities		-		-		4,936		4,936
Loans, net		8,120,208		8,045,314		7,897,187		7,760,490
Investment in Federal Home Loan Bank stock		29,901		29,901		25,000		25,000
Warrants		28		28		30		30

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Option contracts	$	590	$	3	$	200	$	0
Foreign exchange contracts		270,675		5,093		267,644		6,182

Financial Liabilities	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
Deposits	$	8,232,625	$	8,233,462	$	7,981,305	$	7,977,639
Securities sold under agreements to repurchase		700,000		739,254		800,000		852,835
Advances from Federal Home Loan Bank		636,200		636,531		521,200		521,560
Other borrowings		19,025		16,337		19,062		16,107
Long-term debt		121,136		59,305		121,136		58,970

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Option contracts	$	590	$	2	$	-	$	-
Foreign exchange contracts		227,655		3,322		236,350		6,140

	Notional					Notional
	Amount		Fair Value			Amount		Fair Value
Off-Balance Sheet Financial Instruments
Commitments to extend credit	$	1,946,254	$	(2,066	)	$	1,858,669	$	(2,187	)
Standby letters of credit		48,825		(210	)		45,058		(205	)
Other letters of credit		51,704		(34	)		54,098		(34	)
Bill of lading guarantees		173		-			80		-

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

	March 31, 2014
	Estimated
	Fair Value
	Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	161,657	$	161,657	$	-	$	-
Short-term investments		620,306		620,306		-		-
Securities available-for-sale		1,578,897		481,576		1,097,321		-
Loans, net		8,045,314		-		-		8,045,314
Investment in Federal Home Loan Bank stock		29,901		-		29,901		-
Warrants		28		-		-		28
Financial Liabilities
Deposits		8,233,462		-		-		8,233,462
Securities sold under agreements to repurchase		739,254		-		739,254		-
Advances from Federal Home Loan Bank		636,531		-		636,531		-
Other borrowings		16,337		-		-		16,337
Long-term debt		59,305		-		59,305		-

	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 agreements 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		-