Note 14 - Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

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

	September 30, 2020				December 31, 2019
	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
	(In thousands)
Financial Assets
Cash and due from banks	$	128,896	$	128,896	$	177,240	$	177,240
Short-term investments		1,305,170		1,305,170		416,538		416,538
Securities available-for-sale		1,080,540		1,080,540		1,451,842		1,451,842
Loans, net		15,382,439		16,030,529		14,951,631		15,444,752
Equity securities		22,964		22,964		28,005		28,005
Investment in Federal Home Loan Bank stock		17,250		17,250		18,090		18,090
Warrants		20		20		39		39

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Foreign exchange contracts	$	107,071	$	3,236	$	146,397	$	2,411
Interest rate swaps		72,717		3,992		130,401		2,181

	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
Financial Liabilities
Deposits	$	16,034,248	$	16,061,257	$	14,692,308	$	14,719,452
Short-term borrowings		—		—		25,683		25,683
Advances from Federal Home Loan Bank		230,000		238,509		670,000		674,530
Other borrowings		23,788		19,550		36,666		30,764
Long-term debt		119,136		64,296		119,136		76,058

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Option contracts	$	850	$	6	$	908	$	7
Foreign exchange contracts		160,489		1,592		127,003		1,415
Interest rate swaps		686,785		31,525		602,291		14,229

	Notional					Notional
	Amount		Fair Value			Amount		Fair Value
Off-Balance Sheet Financial Instruments
Commitments to extend credit	$	3,033,685	$	(8,847	)	$	3,077,081	$	(9,826	)
Standby letters of credit		255,173		(1,647	)		282,352		(2,431	)
Other letters of credit		24,591		(21	)		22,209		(20	)
Bill of lading guarantees		221		—			319		(1	)

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

	As of September 30, 2020
	Estimated
	Fair Value
	Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	128,896	$	128,896	$	—	$	—
Short-term investments		1,305,170		1,305,170		—		—
Securities available-for-sale		1,080,540		99,980		980,560		—
Loans, net		16,030,529		—		—		16,030,529
Equity securities		22,964		22,964		—		—
Investment in Federal Home Loan Bank stock		17,250		—		17,250		—
Warrants		20		—		—		20
Financial Liabilities
Deposits		16,061,257		—		—		16,061,257
Advances from Federal Home Loan Bank		238,509		—		238,509		—
Other borrowings		19,550		—		—		19,550
Long-term debt		64,296		—		64,296		—

	As of December 31, 2019
	Estimated
	Fair Value
	Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	177,240	$	177,240	$	—	$	—
Short-term investments		416,538		416,538		—		—
Securities available-for-sale		1,451,842		74,936		1,376,906		—
Loans, net		15,444,752		—		—		15,444,752
Equity securities		28,005		28,005		—		—
Investment in Federal Home Loan Bank stock		18,090		—		18,090		—
Warrants		39		—		—		39
Financial Liabilities
Deposits		14,719,452		—		—		14,719,452
Short-term borrowings		25,683		—		—		25,683
Advances from Federal Home Loan Bank		674,530		—		674,530		—
Other borrowings		30,764		—		—		30,764
Long-term debt		76,058		—		76,058		—