Note 16 - Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

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

	December 31, 2018				December 31, 2017
	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
	(In thousands)
Financial Assets
Cash and due from banks	$	225,333	$	225,333	$	247,056	$	247,056
Short-term investments		374,957		374,957		292,745		292,745
Securities available-for-sale		1,242,509		1,242,509		1,333,626		1,333,626
Loans held for sale		-		-		8,000		8,000
Loans, net (1)		13,871,832		13,928,162		12,743,766		12,663,049
Equity securities		25,098		25,098		-		-
Investment in Federal Home Loan Bank stock		17,250		17,250		23,085		23,085
Warrants		184		184		91		91

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Foreign exchange contracts	$	86,875	$	397	$	108,530	$	1,832
Interest rate swaps		467,410		7,810		514,159		5,218

Financial Liabilities	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
Deposits	$	13,702,340	$	13,754,028	$	12,689,893	$	12,700,674
Securities sold under agreements to repurchase		-		-		100,000		100,163
Advances from Federal Home Loan Bank		530,000		529,500		430,000		429,482
Other borrowings		35,756		34,031		52,885		51,075
Long-term debt		189,448		132,615		194,136		141,865

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Option contracts	$	1,215	$	6	$	1,014	$	9
Foreign exchange contracts		94,977		1,763		32,127		453
Interest rate swaps		265,166		1,543		145,399		2,699

	Notional					Notional
	Amount		Fair Value			Amount		Fair Value
Off-Balance Sheet Financial Instruments
Commitments to extend credit	$	2,691,579	$	(8,843	)	$	2,366,368	$	(7,224	)
Standby letters of credit		245,087		(2,662	)		140,814		(1,805	)
Other letters of credit		35,759		(30	)		27,353		(52	)
Bill of lading guarantees		730		-			24		(0	)

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

	As of December 31, 2018
	Estimated
	Fair Value
	Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	225,333	$	225,333	$	-	$	-
Short-term investments		374,957		374,957		-		-
Securities available-for-sale		1,242,509		124,751		1,117,758		-
Loans, net (1)		13,928,162		-		-		13,928,162
Equity securities		25,098		25,098		-		-
Investment in Federal Home Loan Bank stock		17,250		-		17,250		-
Warrants		184		-		-		184
Financial Liabilities
Deposits		13,754,028		-		-		13,754,028
Advances from Federal Home Loan Bank		529,500		-		529,500		-
Other borrowings		34,031		-		-		34,031
Long-term debt		132,615		-		132,615		-

	As of December 31, 2017
	Estimated
	Fair Value
	Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	247,056	$	247,056	$	-	$	-
Short-term investments		292,745		292,745		-		-
Securities available-for-sale		1,333,626		277,622		1,056,004		-
Loans held-for-sale		8,000		-		-		8,000
Loans, net (1)		12,663,049		-		-		12,663,049
Investment in Federal Home Loan Bank stock		23,085		-		23,085		-
Warrants		91		-		-		91
Financial Liabilities
Deposits		12,700,674		-		-		12,700,674
Securities sold under agreement to repurchase		100,163		-		100,163		-
Advances from Federal Home Loan Bank		429,482		-		429,482		-
Other borrowings		51,075		-		-		51,075
Long-term debt		141,865		-		141,865		-