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Note 16 - Fair Value Measurements and Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

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

As of December 31, 2024		Fair Value Measurements Using												Total at
		Level 1				Level 2				Level 3				Fair Value
Assets		(In thousands)
Securities AFS
U.S. Treasury securities		$	621,462			$	—			$	—			$	621,462
U.S. government agency entities			—				9,149				—				9,149
Mortgage-backed securities			—				684,016				—				684,016
Collateralized mortgage obligations			—				24,556				—				24,556
Corporate debt securities			—				207,945				—				207,945
Total securities available-for-sale			621,462				925,666				—				1,547,128
Equity securities
Mutual funds			5,532				—				—				5,532
Preferred stock of government sponsored entities			7,287				—				—				7,287
Other equity securities			20,071				—				—				20,071
Total equity securities			32,890				—				—				32,890
Interest rate swaps			—				39,958				—				39,958
Foreign exchange contracts							490				—				490
Total assets		$	654,352			$	966,114			$	—			$	1,620,466
Liabilities
Interest rate swaps		$	—			$	36,319			$	—			$	36,319
Foreign exchange contracts			—				785				—				785
Total liabilities		$	—			$	37,104			$	—			$	37,104

As of December 31, 2023		Fair Value Measurements Using												Total at
		Level 1				Level 2				Level 3				Fair Value
Assets		(In thousands)
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 available-for-sale			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 December 31, 2024																Total Losses
		Fair Value Measurements Using												Total at				For the Twelve Months Ended
		Level 1				Level 2				Level 3				Fair Value				December 31, 2024				December 31, 2023
Assets		(In thousands)
Non-accrual loans by type:
Commercial loans		$	—			$	—			$	10,896			$	10,896			$	5,654			$	—
Commercial real estate loans			—				—				15,320				15,320				4,049				4,069
Residential mortgage and equity lines			—				—				243				243				59				—
Total non-accrual loans			—				—				26,459				26,459				9,762				4,069
Other real estate owned (1)			—				—				24,126				24,126				—				—
Other equity securities			—				—				1,539				1,539				—				—
Investments in venture capital			—				—				86				86				147				227
Total assets		$	—			$	—			$	52,210			$	52,210			$	9,909			$	4,296

		As of December 31, 2023																Total Losses
		Fair Value Measurements Using												Total at				For the Twelve Months Ended
		Level 1				Level 2				Level 3				Fair Value				December 31, 2023				December 31, 2022
Assets		(In thousands)
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]

		December 31, 2024								December 31, 2023
		Carrying								Carrying
		Amount				Fair Value				Amount				Fair Value
		(In thousands)
Financial Assets
Cash and due from banks		$	157,167			$	157,167			$	173,988			$	173,988
Short-term investments			882,353				882,353				654,813				654,813
Securities AFS			1,547,128				1,547,128				1,604,570				1,604,570
Loans, net			19,203,649				19,500,647				19,382,858				19,605,152
Equity securities			34,429				34,429				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		$	62,794			$	490			$	124,452			$	379
Interest rate swaps			1,065,580				39,958				1,406,879				54,268

Financial Liabilities		Carrying								Carrying
		Amount				Fair Value				Amount				Fair Value
Deposits		$	19,686,199			$	19,670,327			$	19,325,447			$	19,347,070
Advances from Federal Home Loan Bank			60,000				59,606				540,000				536,996
Other borrowings			17,740				15,281				15,787				13,978
Long-term debt			119,136				73,752				119,136				72,304

		Notional								Notional
		Amount				Fair Value				Amount				Fair Value
Foreign exchange contracts			171,945				785				101,378				175
Interest rate swaps			1,198,471				36,319				1,078,880				45,762

		Notional								Notional
		Amount				Fair Value				Amount				Fair Value
Off-Balance Sheet Financial Instruments
Commitments to extend credit		$	3,470,296			$	(18,226	)		$	3,808,620			$	(14,344	)
Standby letters of credit			439,769				(2,900	)			368,618				(2,821	)
Other letters of credit			12,347				(14	)			11,308				(10	)

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

		As of December 31, 2024
		Estimated
		Fair Value
		Measurements				Level 1				Level 2				Level 3
		(In thousands)
Financial Assets
Cash and due from banks		$	157,167			$	157,167			$	—			$	—
Short-term investments			882,353				882,353				—				—
Loans, net			19,500,647				—				—				19,500,647
Equity securities			1,539				—				—				1,539
Investment in Federal Home Loan Bank stock			17,250				—				17,250				—
Financial Liabilities
Deposits			19,670,327				—				—				19,670,327
Advances from Federal Home Loan Bank			59,606				—				59,606				—
Other borrowings			15,281				—				—				15,281
Long-term debt			73,752				—				73,752				—

		As of December 31, 2023
		Estimated
		Fair Value
		Measurements				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, 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				—

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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