Note 14 - Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2019

Notes Tables

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

	September 30, 2019				December 31, 2018
	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
	(In thousands)
Financial Assets
Cash and due from banks	$	257,189	$	257,189	$	225,333	$	225,333
Short-term investments		567,957		567,957		374,957		374,957
Securities available-for-sale		1,427,438		1,427,438		1,242,509		1,242,509
Loans held-for-sale		36,778		36,778		—		—
Loans, net		14,601,565		15,004,114		13,871,832		13,928,162
Equity securities		32,862		32,862		25,098		25,098
Investment in Federal Home Loan Bank stock		17,250		17,250		17,250		17,250
Warrants		31		31		184		184

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Foreign exchange contracts	$	70,955	$	965	$	86,875	$	397
Interest rate swaps		139,466		1,697		467,410		7,810

	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
Financial Liabilities
Deposits	$	14,658,269	$	14,703,977	$	13,702,340	$	13,754,028
Advances from Federal Home Loan Bank		600,000		603,014		530,000		529,500
Other borrowings		38,369		31,844		35,756		34,031
Long-term debt		160,386		113,409		189,448		132,615

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Option contracts	$	1,172	$	6	$	1,215	$	6
Foreign exchange contracts		121,769		2,435		94,977		1,763
Interest rate swaps		581,496		17,734		265,166		1,543

	Notional					Notional
	Amount		Fair Value			Amount		Fair Value
Off-Balance Sheet Financial Instruments
Commitments to extend credit	$	3,097,207	$	(9,291	)	$	2,691,579	$	(8,843	)
Standby letters of credit		264,059		(2,537	)		245,087		(2,662	)
Other letters of credit		29,230		(28	)		35,759		(30	)
Bill of lading guarantees		743		—			730		—

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

	As of September 30, 2019
	Estimated
	Fair Value
	Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	257,189	$	257,189	$	—	$	—
Short-term investments		567,957		567,957		—		—
Securities available-for-sale		1,427,438		—		1,427,438		—
Loans held-for-sale		36,778		—		—		36,778
Loans, net		15,004,114		—		—		15,004,114
Equity securities		32,862		32,862		—		—
Investment in Federal Home Loan Bank stock		17,250		—		17,250		—
Warrants		31		—		—		31
Financial Liabilities
Deposits		14,703,977		—		—		14,703,977
Advances from Federal Home Loan Bank		603,014		—		603,014		—
Other borrowings		31,844		—		—		31,844
Long-term debt		113,409		—		113,409		—

	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		—