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Note 16 - Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

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

		December 31, 2019								December 31, 2018
		Carrying								Carrying
		Amount				Fair Value				Amount				Fair Value
		(In thousands)
Financial Assets
Cash and due from banks		$	177,240			$	177,240			$	225,333			$	225,333
Short-term investments			416,538				416,538				374,957				374,957
Securities available-for-sale			1,451,842				1,451,842				1,242,509				1,242,509
Loans, net ⁽¹⁾			14,951,631				15,444,752				13,871,832				13,928,162
Equity securities			28,005				28,005				25,098				25,098
Investment in Federal Home Loan Bank stock			18,090				18,090				17,250				17,250
Warrants			39				39				184				184

		Notional								Notional
		Amount				Fair Value				Amount				Fair Value
Foreign exchange contracts		$	146,397			$	2,411			$	86,875			$	397
Interest rate swaps			130,401				2,181				467,410				7,810

Financial Liabilities		Carrying								Carrying
		Amount				Fair Value				Amount				Fair Value
Deposits		$	14,692,308			$	14,719,452			$	13,702,340			$	13,754,028
Short-term borrowings			25,683				25,683				—				—
Advances from Federal Home Loan Bank			670,000				674,530				530,000				529,500
Other borrowings			36,666				30,764				35,756				34,031
Long-term debt			119,136				76,058				189,448				132,615

		Notional								Notional
		Amount				Fair Value				Amount				Fair Value
Option contracts		$	908			$	7			$	1,215			$	6
Foreign exchange contracts			127,003				1,415				94,977				1,763
Interest rate swaps			602,291				14,229				265,166				1,543

		Notional								Notional
		Amount				Fair Value				Amount				Fair Value
Off-Balance Sheet Financial Instruments
Commitments to extend credit		$	3,077,081			$	(9,826	)		$	2,691,579			$	(8,843	)
Standby letters of credit			282,352				(2,431	)			245,087				(2,662	)
Other letters of credit			22,209				(20	)			35,759				(30	)
Bill of lading guarantees			319				(1	)			730				—

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

		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 ⁽¹⁾			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				—

		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 ⁽¹⁾			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				—