Note 17 - Fair Value Measurements and Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

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

As of December 31, 2022	Fair Value Measurements Using						Total at
	Level 1		Level 2		Level 3		Fair Value
Assets	(In thousands)
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

As of December 31, 2021	Fair Value Measurements Using						Total at
	Level 1		Level 2		Level 3		Fair Value
Assets	(In thousands)
Securities available-for-sale
U.S. Treasury securities	$	—	$	—	$	—	$	—
U.S. government agency entities		—		87,509		—		87,509
Mortgage-backed securities		—		888,665		—		888,665
Collateralized mortgage obligations		—		9,117		—		9,117
Corporate debt securities		—		142,018		—		142,018
Total securities available-for-sale		—		1,127,309		—		1,127,309
Equity securities
Mutual funds		6,230		—		—		6,230
Preferred stock of government sponsored entities		1,811		—		—		1,811
Other equity securities		14,278		—		—		14,278
Total equity securities		22,319		—		—		22,319
Warrants		—		—		23		23
Interest rate swaps		—		10,090		—		10,090
Foreign exchange contracts		—		1,113		—		1,113
Total assets	$	22,319	$	1,138,512	$	23	$	1,160,854
Liabilities
Interest rate swaps	$	—	$	12,642	$	—	$	12,642
Foreign exchange contracts		—		327		—		327
Total liabilities	$	—	$	12,969	$	—	$	12,969

Fair Value Measurements, Nonrecurring [Table Text Block]

	As of December 31, 2022								Total Losses
	Fair Value Measurements Using						Total at		For the Twelve Months Ended
	Level 1		Level 2		Level 3		Fair Value		December 31, 2022		December 31, 2021
Assets	(In thousands)
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 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

	As of December 31, 2021								Total Losses/(Gains)
	Fair Value Measurements Using						Total at		For the Twelve Months Ended
	Level 1		Level 2		Level 3		Fair Value		December 31, 2021		December 31, 2020
Assets	(In thousands)
Non-accrual loans by type:
Commercial loans	$	—	$	—	$	4,327	$	4,327	$	1,012	$	7,012
Commercial mortgage loans		—		—		13,335		13,335		—		—
Residential mortgage and equity lines		—		—		5,243		5,243		—		—
Total non-accrual loans		—		—		22,905		22,905		1,012		7,012
Other real estate owned (1)		—		—		4,589		4,589		17		717
Investments in venture capital		—		—		952		952		143		107
Total assets	$	—	$	—	$	28,446	$	28,446	$	1,172	$	7,836

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

	December 31, 2022				December 31, 2021
	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
	(In thousands)
Financial Assets
Cash and due from banks	$	195,440	$	195,440	$	134,141	$	134,141
Short-term investments		966,962		966,962		2,315,563		2,315,563
Securities available-for-sale		1,473,348		1,473,348		1,127,309		1,127,309
Loans, net		18,100,898		17,944,588		16,202,001		16,499,869
Equity securities		22,158		22,158		22,319		22,319
Investment in Federal Home Loan Bank stock		17,250		17,250		17,250		17,250
Warrants		50		50		23		23

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Foreign exchange contracts	$	72,996	$	448	$	181,997	$	1,113
Interest rate swaps		817,615		44,443		904,635		10,090

Financial Liabilities	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
Deposits	$	18,505,279	$	18,572,387	$	18,058,842	$	18,051,720
Advances from Federal Home Loan Bank		485,000		482,737		20,000		21,279
Other borrowings		22,600		18,385		23,145		18,945
Long-term debt		119,136		68,231		119,136		62,274

	Notional				Notional
	Amount		Fair Value		Amount		Fair Value
Option contracts	$	—	$	—	$	676	$	3
Foreign exchange contracts		170,213		942		51,782		327
Interest rate swaps		595,426		51,864		872,400		12,642

	Notional					Notional
	Amount		Fair Value			Amount		Fair Value
Off-Balance Sheet Financial Instruments
Commitments to extend credit	$	3,630,304	$	(14,797	)	$	3,297,362	$	(12,594	)
Standby letters of credit		315,821		(2,738	)		266,490		(2,640	)
Other letters of credit		29,416		(33	)		16,652		(13	)
Bill of lading guarantees		—		—			—		—

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

	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		—		—
Securities available-for-sale		1,473,348		240,500		1,232,848		—
Loans, net		17,944,588		—		—		17,944,588
Equity securities		22,158		22,158		—		—
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		—

	As of December 31, 2021
	Estimated
	Fair Value
	Measurements		Level 1		Level 2		Level 3
	(In thousands)
Financial Assets
Cash and due from banks	$	134,141	$	134,141	$	—	$	—
Short-term investments		2,315,563		2,315,563		—		—
Securities available-for-sale		1,127,309		—		1,127,309		—
Loans, net		16,499,869		—		—		16,499,869
Equity securities		22,319		22,319		—		—
Investment in Federal Home Loan Bank stock		17,250		—		17,250		—
Warrants		23		—		—		23
Financial Liabilities
Deposits		18,051,720		—		—		18,051,720
Advances from Federal Home Loan Bank		21,279		—		21,279		—
Other borrowings		18,945		—		—		18,945
Long-term debt		62,274		—		62,274		—