Note 12 - Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2015

Fair Value Disclosures [Abstract]

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

	June 30, 2015				December 31, 2014
	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
	(In thousands)
Financial Assets
Cash and due from banks	$	166,933	$	166,933	$	176,830	$	176,830
Short-term investments		48,711		48,711		489,614		489,614
Securities available-for-sale		1,545,699		1,545,699		1,318,935		1,318,935
Loans held for sale		-		-		973		1,225
Loans, net		9,338,364		9,271,167		8,740,268		8,688,072
Investment in Federal Home Loan Bank stock		17,250		17,250		30,785		30,785
Warrants		32		32		27		27

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Foreign exchange contracts	$	193,066	$	2,326	$	167,005	$	1,876

Financial Liabilities	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
Deposits	$	9,338,863	$	9,341,551	$	8,783,460	$	8,785,342
Securities sold under agreements to repurchase		400,000		419,915		450,000		473,816
Advances from Federal Home Loan Bank		210,000		210,020		425,000		424,974
Other borrowings		20,261		17,571		19,934		17,978
Long-term debt		119,136		59,015		119,136		59,425

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Foreign exchange contracts	$	188,048	$	3,201	$	178,868	$	5,007
Interest rate swaps		298,538		4,095		300,480		4,626

	Notional					Notional
	Amount		Fair Value			Amount		Fair Value
Off-Balance Sheet Financial Instruments
Commitments to extend credit	$	2,003,486	$	(4,123	)	$	2,071,766	$	(3,442	)
Standby letters of credit		50,293		(202	)		53,910		(243	)
Other letters of credit		57,204		(35	)		48,142		(29	)
Bill of lading guarantees		199		(1	)		108		-

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

	June 30, 2015
	Estimated
	Fair Value
	Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	166,933	$	166,933	$	-	$	-
Short-term investments		48,711		48,711		-		-
Securities available-for-sale		1,545,699		305,954		1,239,745		-
Loans, net		9,271,167		-		-		9,271,167
Investment in Federal Home Loan Bank stock		17,250		-		17,250		-
Warrants		32		-		-		32
Financial Liabilities
Deposits		9,341,551		-		-		9,341,551
Securities sold under agreements to repurchase		419,915		-		419,915		-
Advances from Federal Home Loan Bank		210,020		-		210,020		-
Other borrowings		17,571		-		-		17,571
Long-term debt		59,015		-		59,015		-

	December 31, 2014
	Estimated
	Fair Value
	Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	176,830	$	176,830	$	-	$	-
Short-term investments		489,614		489,614		-		-
Securities available-for-sale		1,318,935		669,870		649,065		-
Loans held-for-sale		1,225		-		-		1,225
Loans, net		8,688,072		-		-		8,688,072
Investment in Federal Home Loan Bank stock		30,785		-		30,785		-
Warrants		27		-		-		27
Financial Liabilities
Deposits		8,785,342		-		-		8,785,342
Securities sold under agreements to repurchase		473,816		-		473,816		-
Advances from Federal Home Loan Bank		424,974		-		424,974		-
Other borrowings		17,978		-		-		17,978
Long-term debt		59,425		-		59,425		-