Note 12 - Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2014

Fair Value Disclosures [Abstract]

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

	September 30, 2014				December 31, 2013
	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
	(In thousands)
Financial Assets
Cash and due from banks	$	200,302	$	200,302	$	153,747	$	153,747
Short-term investments		597,747		597,747		516,938		516,938
Securities available-for-sale		1,340,092		1,340,092		1,586,668		1,586,668
Trading securities		-		-		4,936		4,936
Loans, net		8,676,153		8,576,545		7,897,187		7,760,490
Investment in Federal Home Loan Bank stock		34,090		34,090		25,000		25,000
Warrants		12		12		30		30

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Option contracts	$	-	$	-	$	200	$	0
Foreign exchange contracts		183,753		1,936		267,644		6,182
Interest rate swaps		147,358		442		-		-

Financial Liabilities	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
Deposits	$	8,694,669	$	8,692,118	$	7,981,305	$	7,977,639
Securities sold under agreements to repurchase		550,000		576,670		800,000		852,835
Advances from Federal Home Loan Bank		555,000		555,000		521,200		521,560
Other borrowings		18,882		15,853		19,062		16,107
Long-term debt		119,136		59,425		121,136		58,970

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Foreign exchange contracts	$	201,240	$	4,437	$	236,350	$	6,140
Interest rate swaps		119,136		280		-		-

	Notional					Notional
	Amount		Fair Value			Amount		Fair Value
Off-Balance Sheet Financial Instruments
Commitments to extend credit	$	1,839,039	$	(3,160	)	$	1,858,669	$	(2,187	)
Standby letters of credit		54,304		(331	)		45,058		(205	)
Other letters of credit		49,623		(29	)		54,098		(34	)
Bill of lading guarantees		51		-			80		-

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

	September 30, 2014
	Estimated
	Fair Value
	Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	200,302	$	200,302	$	-	$	-
Short-term investments		597,747		597,747		-		-
Securities available-for-sale		1,340,092		553,133		786,959		-
Loans, net		8,576,545		-		-		8,576,545
Investment in Federal Home Loan Bank stock		34,090		-		34,090		-
Warrants		12		-		-		12
Financial Liabilities
Deposits		8,692,118		-		-		8,692,118
Securities sold under agreements to repurchase		576,670		-		576,670		-
Advances from Federal Home Loan Bank		555,000		-		555,000		-
Other borrowings		15,853		-		-		15,853
Long-term debt		59,425		-		59,425		-

	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		-