Note 12 - Fair Value Measurements and Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2024

Notes Tables

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

	March 31, 2024
	Fair Value Measurements Using						Total Fair Value
	Level 1		Level 2		Level 3		Measurements
	(In thousands)
Assets
Securities AFS
U.S. Treasury securities	$	541,798	$	—	$	—	$	541,798
U.S. government agency entities		—		12,058		—		12,058
U.S. government sponsored entities		—		59,745		—		59,745
Mortgage-backed securities		—		754,162		—		754,162
Collateralized mortgage obligations		—		27,198		—		27,198
Corporate debt securities		—		258,206		—		258,206
Total securities AFS		541,798		1,111,369		—		1,653,167
Equity securities
Mutual funds		5,526		—		—		5,526
Preferred stock of government sponsored entities		2,384		—		—		2,384
Other equity securities		23,470		—		—		23,470
Total equity securities		31,380		—		—		31,380
Interest rate swaps		—		55,138		—		55,138
Foreign exchange contracts		—		334		—		334
Total assets	$	573,178	$	1,166,841	$	—	$	1,740,019
Liabilities
Interest rate swaps	$	—	$	42,014	$	—	$	42,014
Foreign exchange contracts		—		186		—		186
Total liabilities	$	—	$	42,200	$	—	$	42,200

	December 31, 2023
	Fair Value Measurements Using						Total Fair Value
	Level 1		Level 2		Level 3		Measurements
	(In thousands)
Assets
Securities AFS
U.S. Treasury securities	$	495,300	$	—	$	—	$	495,300
U.S. government agency entities		—		48,169		—		48,169
Mortgage-backed securities		—		786,723		—		786,723
Collateralized mortgage obligations		—		28,044		—		28,044
Corporate debt securities		—		246,334		—		246,334
Total securities AFS		495,300		1,109,270		—		1,604,570
Equity securities
Mutual funds		5,585		—		—		5,585
Preferred stock of government sponsored entities		1,821		—		—		1,821
Other equity securities		33,000		—		—		33,000
Total equity securities		40,406		—		—		40,406
Interest rate swaps		—		54,268		—		54,268
Foreign exchange contracts		—		379		—		379
Total assets	$	535,706	$	1,163,917	$	—	$	1,699,623
Liabilities
Interest rate swaps	$	—	$	45,762	$	—	$	45,762
Foreign exchange contracts		—		175		—		175
Total liabilities	$	—	$	45,937	$	—	$	45,937

Fair Value Measurements, Nonrecurring [Table Text Block]

	As of March 31, 2024								Total Losses
	Fair Value Measurements Using						Total Fair Value		For the Three Months Ended
	Level 1		Level 2		Level 3		Measurements		March 31, 2024		March 31, 2023
	(In thousands)
Assets
Non accrual loans by type:
Commercial loans	$	—	$	—	$	129	$	129	$	1,038	$	2,793
Commercial real estate loans		—		—		20,002		20,002		251		3,990
Total non accrual loans		—		—		20,131		20,131		1,289		6,783
Other real estate owned (1)		—		—		20,446		20,446		—		—
Investments in venture capital		—		—		93		93		—		—
Total assets	$	—	$	—	$	40,670	$	40,670	$	1,289	$	6,783

	As of December 31, 2023								Total Losses
	Fair Value Measurements Using						Total Fair Value		For the Twelve Months Ended
	Level 1		Level 2		Level 3		Measurements		December 31, 2023		December 31, 2022
	(In thousands)
Assets
Non accrual loans by type:
Commercial loans	$	—	$	—	$	191	$	191	$	—	$	1,786
Commercial real estate loans		—		—		6,882		6,882		4,069		2,091
Total non accrual loans		—		—		7,073		7,073		4,069		3,877
Other real estate owned (1)		—		—		20,446		20,446		—		—
Investments in venture capital		—		—		237		237		227		268
Total assets	$	—	$	—	$	27,756	$	27,756	$	4,296	$	4,145

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

	March 31, 2024				December 31, 2023
	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
	(In thousands)
Financial Assets
Cash and due from banks	$	165,284	$	165,284	$	173,988	$	173,988
Short-term investments		1,010,651		1,010,651		654,813		654,813
Securities AFS		1,653,167		1,653,167		1,604,570		1,604,570
Loans held-for-sale		23,171		23,171		—		—
Loans held for investment, net		19,263,070		19,597,530		19,382,858		19,605,152
Equity securities		31,380		31,380		40,406		40,406
Investment in Federal Home Loan Bank stock		17,250		17,250		17,746		17,746

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Foreign exchange contracts	$	250,648	$	334	$	124,452	$	379
Interest rate swaps		1,100,019		55,138		1,406,879		54,268

	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
Financial Liabilities
Deposits	$	19,846,259	$	19,855,328	$	19,325,447	$	19,347,070
Advances from Federal Home Loan Bank		265,000		264,596		540,000		536,996
Other borrowings		17,557		15,373		15,787		13,978
Long-term debt		119,136		73,102		119,136		72,304

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Foreign exchange contracts	$	66,081	$	186	$	101,378	$	175
Interest rate swaps		952,560		42,014		1,078,880		45,762

	Notional					Notional
	Amount		Fair Value			Amount		Fair Value
Off-Balance Sheet Financial Instruments
Commitments to extend credit	$	3,925,285	$	(19,052	)	$	3,808,620	$	(14,344	)
Standby letters of credit		386,442		(3,031	)		368,618		(2,821	)
Other letters of credit		19,450		(17	)		11,308		(10	)

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

	As of March 31, 2024
	Fair Value		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	165,284	$	165,284	$	—	$	—
Short-term investments		1,010,651		1,010,651		—		—
Loans held-for-sale		23,171		—		23,171		—
Loans held for investment, net		19,597,530		—		—		19,597,530
Equity securities		31,380		31,380		—		—
Investment in Federal Home Loan Bank stock		17,250		—		17,250		—
Financial Liabilities
Deposits		19,855,328		—		—		19,855,328
Advances from Federal Home Loan Bank		264,596		—		264,596		—
Other borrowings		15,373		—		—		15,373
Long-term debt		73,102		—		73,102		—

	As of December 31, 2023
	Fair Value		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	173,988	$	173,988	$	—	$	—
Short-term investments		654,813		654,813		—		—
Loans held for investment, net		19,605,152		—		—		19,605,152
Equity securities		40,406		40,406		—		—
Investment in Federal Home Loan Bank stock		17,746		—		17,746		—
Financial Liabilities
Deposits		19,347,070		—		—		19,347,070
Advances from Federal Home Loan Bank		536,996		—		536,996		—
Other borrowings		13,978		—		—		13,978
Long-term debt		72,304		—		72,304		—