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Note 13 - Fair Value Measurements and Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2023

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

		*September 30, 2023*
		*Fair Value Measurements Using*												*Total Fair Value*
		*Level 1*				*Level 2*				*Level 3*				*Measurements*
		(In thousands)
Assets
Securities available-for-sale
U.S. Treasury securities		$	392,842			$	—			$	—			$	392,842
U.S. government agency entities			—				51,001				—				51,001
U.S. government sponsored entities			—				33,620				—				33,620
Mortgage-backed securities			—				761,803				—				761,803
Collateralized mortgage obligations			—				27,698				—				27,698
Corporate debt securities			—				231,872				—				231,872
Foreign debt securities			—				9,962				—				9,962
Total securities available-for-sale			392,842				1,115,956				—				1,508,798

Equity securities
Mutual funds			5,337				—				—				5,337
Preferred stock of government sponsored entities			1,378				—				—				1,378
Other equity securities			24,741				—				—				24,741
Total equity securities			31,456				—				—				31,456

Warrants			—				—				42				42
Interest rate swaps			—				83,434				—				83,434
Foreign exchange contracts			—				858				—				858
Total assets		$	424,298			$	1,200,248			$	42			$	1,624,588

Liabilities
Interest rate swaps		$	—			$	56,058			$	—			$	56,058
Foreign exchange contracts			—				939				—				939
Total liabilities		$	—			$	56,997			$	—			$	56,997

		December 31, 2022
		Fair Value Measurements Using												Total Fair Value
		Level 1				Level 2				Level 3				Measurements
		(In thousands)
Assets
Securities available-for-sale
U.S. Treasury securities		$	240,500			$	—			$	—			$	240,500
U.S. government agency entities			—				63,610				—				63,610
U.S. government sponsored entities			—				30,000				—				30,000
Mortgage-backed securities			—				867,094				—				867,094
Collateralized mortgage obligations			—				31,061				—				31,061
Corporate debt securities			—				241,083				—				241,083
Total securities available-for-sale			240,500				1,232,848				—				1,473,348

Equity securities
Mutual funds			5,509				—				—				5,509
Preferred stock of government sponsored entities			1,289				—				—				1,289
Other equity securities			15,360				—				—				15,360
Total equity securities			22,158				—				—				22,158

Warrants			—				—				50				50
Interest rate swaps			—				44,443				—				44,443
Foreign exchange contracts			—				448				—				448
Total assets		$	262,658			$	1,277,739			$	50			$	1,540,447

Liabilities
Interest rate swaps		$	—			$	51,864			$	—			$	51,864
Foreign exchange contracts			—				942				—				942
Total liabilities		$	—			$	52,806			$	—			$	52,806

Fair Value Measurements, Nonrecurring [Table Text Block]

		*As of September 30, 2023*																*Total Losses*
		*Fair Value Measurements Using*												*Total Fair Value*				*For the Three Months Ended*								*For the Nine Months Ended*
		*Level 1*				*Level 2*				*Level 3*				*Measurements*				*September 30, 2023*				*September 30, 2022*				*September 30, 2023*				*September 30, 2022*
		(In thousands)
Assets
Non accrual loans by type:
Commercial loans		$	—			$	—			$	—			$	—			$	—			$	1,786			$	—			$	1,786
Commercial mortgage loans			—				—				7,051				7,051				252				—				4,069				—
Real estate construction loans			—				—				5,034				5,034				—				—				—				—
Total non accrual loans			—				—				12,085				12,085				252				1,786				4,069				1,786
Other real estate owned ⁽¹⁾			—				—				15,328				15,328				—				—				—				—
Investments in venture capital			—				—				447				447				—				—				—				—
Total assets		$	—			$	—			$	27,860			$	27,860			$	252			$	1,786			$	4,069			$	1,786

		As of December 31, 2022																Total Losses
		Fair Value Measurements Using												Total Fair Value				For the Twelve Months Ended
		Level 1				Level 2				Level 3				Measurements				December 31, 2022				December 31, 2021
		(In thousands)
Assets
Non accrual loans by type:
Commercial loans		$	—			$	—			$	12,950			$	12,950			$	1,786			$	1,012
Commercial mortgage loans			—				—				32,205				32,205				2,091				—
Residential mortgage loans and equity lines			—				—				8,978				8,978				—				—
Installment and other loans			—				—				8				8				—				—
Total non accrual loans			—				—				54,141				54,141				3,877				1,012
Other real estate owned ⁽¹⁾			—				—				4,328				4,328				—				17
Investments in venture capital			—				—				689				689				268				143
Total assets		$	—			$	—			$	59,158			$	59,158			$	4,145			$	1,172

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

		*September 30, 2023*								*December 31, 2022*
		*Carrying*								*Carrying*
		*Amount*				*Fair Value*				*Amount*				*Fair Value*
		(In thousands)
Financial Assets
Cash and due from banks		$	145,580			$	145,580			$	195,440			$	195,440
Short-term investments			1,017,354				1,017,354				966,962				966,962
Securities available-for-sale			1,508,798				1,508,798				1,473,348				1,473,348
Loans, net			18,859,682				18,838,004				18,100,898				17,944,588
Equity securities			31,456				31,456				22,158				22,158
Investment in Federal Home Loan Bank stock			17,250				17,250				17,250				17,250
Warrants			42				42				50				50

		*Notional*								*Notional*
		*Amount*				*Fair Value*				*Amount*				*Fair Value*
Foreign exchange contracts		$	220,784			$	858			$	72,996			$	448
Interest rate swaps			1,502,403				83,434				817,615				44,443

		*Carrying*								*Carrying*
		*Amount*				*Fair Value*				*Amount*				*Fair Value*
Financial Liabilities
Deposits		$	19,635,588			$	19,746,224			$	18,505,279			$	18,572,387
Advances from Federal Home Loan Bank			15,000				14,186				485,000				482,737
Other borrowings			22,374				18,282				22,600				18,385
Long-term debt			119,136				68,536				119,136				68,231

		*Notional*								*Notional*
		*Amount*				*Fair Value*				*Amount*				*Fair Value*
Foreign exchange contracts		$	64,971			$	939			$	170,213			$	942
Interest rate swaps			642,054				56,058				595,426				51,864

		*Notional*								*Notional*
		*Amount*				*Fair Value*				*Amount*				*Fair Value*
Off-Balance Sheet Financial Instruments
Commitments to extend credit		$	3,989,855			$	(15,038	)		$	3,630,304			$	(14,797	)
Standby letters of credit			329,789				(2,308	)			315,821				(2,738	)
Other letters of credit			10,214				(10	)			29,416				(33	)
Bill of lading guarantees			—				—				—				—

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

		*As of September 30, 2023*
		*Estimated*
		*Fair Value*
		*Measurements*				*Level 1*				*Level 2*				*Level 3*
		(In thousands)
Financial Assets
Cash and due from banks		$	145,580			$	145,580			$	—			$	—
Short-term investments			1,017,354				1,017,354				—				—
Loans, net			18,838,004				—				—				18,838,004
Investment in Federal Home Loan Bank stock			17,250				—				17,250				—
Financial Liabilities
Deposits			19,746,224				—				—				19,746,224
Advances from Federal Home Loan Bank			14,186				—				14,186				—
Other borrowings			18,282				—				—				18,282
Long-term debt			68,536				—				68,536				—

		*As of December 31, 2022*
		*Estimated*
		*Fair Value*
		*Measurements*				*Level 1*				*Level 2*				*Level 3*
		(In thousands)
Financial Assets
Cash and due from banks		$	195,440			$	195,440			$	—			$	—
Short-term investments			966,962				966,962				—				—
Loans, net			17,944,588				—				—				17,944,588
Investment in Federal Home Loan Bank stock			17,250				—				17,250				—
Warrants			50				—				—				50
Financial Liabilities
Deposits			18,572,387				—				—				18,572,387
Advances from Federal Home Loan Bank			482,737				—				482,737				—
Other borrowings			18,385				—				—				18,385
Long-term debt			68,231				—				68,231				—