Note 14 - Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2019

Notes Tables

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

	June 30, 2019				December 31, 2018
	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
	(In thousands)
Financial Assets
Cash and due from banks	$	206,123	$	206,123	$	225,333	$	225,333
Short-term investments		351,603		351,603		374,957		374,957
Securities available-for-sale		1,471,584		1,471,584		1,242,509		1,242,509
Loans, net		14,469,444	14,814,173			13,871,832		13,928,162
Equity securities		32,498		32,498		25,098		25,098
Investment in Federal Home Loan Bank stock		17,250		17,250		17,250		17,250
Warrants		44		44		184		184

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Foreign exchange contracts	$	109,659	$	638	$	86,875	$	397
Interest rate swaps		123,574		1,440		467,410		7,810

	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
Financial Liabilities
Deposits	$	14,362,922	$	14,417,628	$	13,702,340	$	13,754,028
Advances from Federal Home Loan Bank		550,000		551,591		530,000		529,500
Other borrowings		49,663		43,084		35,756		34,031
Long-term debt		169,761		121,592		189,448		132,615

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Option contracts	$	1,698	$	14	$	1,215	$	6
Foreign exchange contracts		95,600		876		94,977		1,763
Interest rate swaps		584,226		13,779		265,166		1,543

	Notional					Notional
	Amount		Fair Value			Amount		Fair Value
Off-Balance Sheet Financial Instruments
Commitments to extend credit	$	3,019,604	$	(8,916	)	$	2,691,579	$	(8,843	)
Standby letters of credit		255,584		(2,630	)		245,087		(2,662	)
Other letters of credit		24,086		(21	)		35,759		(30	)
Bill of lading guarantees		188		—			730		—

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

	As of June 30, 2019
	Estimated
	Fair Value
	Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	206,123	$	206,123	$	—	$	—
Short-term investments		351,603		351,603		—		—
Securities available-for-sale		1,471,584		49,791		1,421,793		—
Loans, net	14,814,173			—		—	14,814,173
Equity securities		32,498		32,498		—		—
Investment in Federal Home Loan Bank stock		17,250		—		17,250		—
Warrants		44		—		—		44
Financial Liabilities
Deposits		14,417,628		—		—		14,417,628
Advances from Federal Home Loan Bank		551,591		—		551,591		—
Other borrowings		43,084		—		—		43,084
Long-term debt		121,592		—		121,592		—

	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		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		—