Note 14 - Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

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

	March 31, 2019				December 31, 2018
	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
	(In thousands)
Financial Assets
Cash and due from banks	$	194,928	$	194,928	$	225,333	$	225,333
Short-term investments		343,452		343,452		374,957		374,957
Securities available-for-sale		1,309,853		1,309,853		1,242,509		1,242,509
Loans, net		14,153,318		14,373,444		13,871,832		13,928,162
Equity securities		29,261		29,261		25,098		25,098
Investment in Federal Home Loan Bank stock		17,250		17,250		17,250		17,250
Warrants		181		181		184		184

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Foreign exchange contracts	$	76,768	$	459	$	86,875	$	397
Interest rate swaps		358,509		4,480		467,410		7,810

	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
Financial Liabilities
Deposits	$	14,086,364	$	14,143,470	$	13,702,340	$	13,754,028
Advances from Federal Home Loan Bank		420,000		420,450		530,000		529,500
Other borrowings		48,099		42,361		35,756		34,031
Long-term debt		174,448		123,897		189,448		132,615

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Option contracts	$	2,188	$	12	$	1,215	$	6
Foreign exchange contracts		57,273		645		94,977		1,763
Interest rate swaps		346,357		5,727		265,166		1,543

	Notional					Notional
	Amount		Fair Value			Amount		Fair Value
Off-Balance Sheet Financial Instruments
Commitments to extend credit	$	2,776,325	$	(5,703	)	$	2,691,579	$	(8,843	)
Standby letters of credit		260,268		(2,890	)		245,087		(2,662	)
Other letters of credit		29,354		(28	)		35,759		(30	)
Bill of lading guarantees		662		—			730		—

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

	As of March 31, 2019
	Estimated
	Fair Value
	Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	194,928	$	194,928	$	—	$	—
Short-term investments		343,452		343,452		—		—
Securities available-for-sale		1,309,853		149,240		1,160,613		—
Loans, net		14,373,444		—		—		14,373,444
Equity securities		29,261		29,261		—		—
Investment in Federal Home Loan Bank stock		17,250		—		17,250		—
Warrants		181		—		—		181
Financial Liabilities
Deposits		14,143,470		—		—		14,143,470
Advances from Federal Home Loan Bank		420,450		—		420,450		—
Other borrowings		42,361		—		—		42,361
Long-term debt		123,897		—		123,897		—

	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		—