Note 14 - Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

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

	June 30, 2020				December 31, 2019
	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
	(In thousands)
Financial Assets
Cash and due from banks	$	148,700	$	148,700	$	177,240	$	177,240
Short-term investments		1,425,001		1,425,001		416,538		416,538
Securities available-for-sale		1,146,102		1,146,102		1,451,842		1,451,842
Loans, net		15,434,096		15,954,278		14,951,631		15,444,752
Equity securities		24,570		24,570		28,005		28,005
Investment in Federal Home Loan Bank stock		17,250		17,250		18,090		18,090
Warrants		13		13		39		39

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Foreign exchange contracts	$	101,020	$	1,529	$	146,397	$	2,411
Interest rate swaps		50,599		3,842		130,401		2,181

	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
Financial Liabilities
Deposits	$	16,281,904	$	16,334,769	$	14,692,308	$	14,719,452
Short-term borrowings		—		—		25,683		25,683
Advances from Federal Home Loan Bank		230,000		241,047		670,000		674,530
Other borrowings		40,152		33,040		36,666		30,764
Long-term debt		119,136		61,913		119,136		76,058

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Option contracts	$	530	$	6	$	908	$	7
Foreign exchange contracts		179,211		531		127,003		1,415
Interest rate swaps		697,212		33,760		602,291		14,229

	Notional					Notional
	Amount		Fair Value			Amount		Fair Value
Off-Balance Sheet Financial Instruments
Commitments to extend credit	$	3,073,581	$	(9,464	)	$	3,077,081	$	(9,826	)
Standby letters of credit		262,028		(1,981	)		282,352		(2,431	)
Other letters of credit		28,199		(30	)		22,209		(20	)
Bill of lading guarantees		124		—			319		(1	)

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

	As of June 30, 2020
	Estimated
	Fair Value
	Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	148,700	$	148,700	$	—	$	—
Short-term investments		1,425,001		1,425,001		—		—
Securities available-for-sale		1,146,102		99,927		1,046,175		—
Loans, net		15,954,278		—		—		15,954,278
Equity securities		24,570		24,570		—		—
Investment in Federal Home Loan Bank stock		17,250		—		17,250		—
Warrants		13		—		—		13
Financial Liabilities
Deposits		16,334,769		—		—		16,334,769
Advances from Federal Home Loan Bank		241,047		—		241,047		—
Other borrowings		33,040		—		—		33,040
Long-term debt		61,913		—		61,913		—

	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		—