Note 12 - Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2014

Fair Value Disclosures [Abstract]

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

	June 30, 2014				December 31, 2013
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(In thousands)
Financial Assets
Cash and due from banks	$	245,860	$	245,860	$	153,747	$	153,747
Short-term investments		803,576		803,576		516,938		516,938
Securities available-for-sale		1,339,989		1,339,989		1,586,668		1,586,668
Trading securities		-		-		4,936		4,936
Loans, net		8,382,700		8,262,977		7,897,187		7,760,490
Investment in Federal Home Loan Bank stock		25,671		25,671		25,000		25,000
Warrants		21		21		30		30

	Notional Amount		Fair Value		Notional Amount		Fair Value
Option contracts	$	-	$	-	$	200	$	0
Foreign exchange contracts		226,061		3,438		267,644		6,182

Financial Liabilities
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Deposits	$	8,580,596	$	8,578,747	$	7,981,305	$	7,977,639
Securities sold under agreements to repurchase		700,000		733,020		800,000		852,835
Advances from Federal Home Loan Bank		521,200		521,966		521,200		521,560
Other borrowings		18,985		16,161		19,062		16,107
Long-term debt		119,136		58,365		121,136		58,970

	Notional Amount		Fair Value		Notional Amount		Fair Value
Foreign exchange contracts	$	161,760	$	1,594	$	236,350	$	6,140
Interest rate swaps		267,194		454		-		-

	Notional Amount		Fair Value			Notional Amount		Fair Value
Off-Balance Sheet Financial Instruments
Commitments to extend credit	$	1,933,456	$	(2,856	)	$	1,858,669	$	(2,187	)
Standby letters of credit		47,983		(238	)		45,058		(205	)
Other letters of credit		59,445		(31	)		54,098		(34	)
Bill of lading guarantees		71		-			80		-

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

	June 30, 2014
	Estimated Fair Value Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	245,860	$	245,860	$	-	$	-
Short-term investments		803,576		803,576		-		-
Securities available-for-sale		1,339,989		565,163		774,826		-
Loans, net		8,262,977		-		-		8,262,977
Investment in Federal Home Loan Bank stock		25,671		-		25,671		-
Warrants		21		-		-		21
Financial Liabilities
Deposits		8,578,747		-		-		8,578,747
Securities sold under agreements to repurchase		733,020		-		733,020		-
Advances from Federal Home Loan Bank		521,966		-		521,966		-
Other borrowings		16,161		-		-		16,161
Long-term debt		58,365		-		58,365		-

	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		-