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Investment Securities (Tables)

12 Months Ended

Dec. 31, 2025

Investments, Debt and Equity Securities [Abstract]

Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Available for Sale Debt Securities

The amortized cost, gross unrealized gains and losses and fair value of AFS debt securities at December 31, 2025 and 2024 were as follows: 

			Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value
			(in thousands)
December 31, 2025
U.S. Treasury securities			$	250,494					$	226					$	(22,233)					$	228,487
U.S. government agency securities			41,026						35						(1,117)						39,944
Obligations of states and political subdivisions:
Obligations of states and state agencies			44,079						—						(646)						43,433
Municipal bonds			181,883						1						(31,937)						149,947
Total obligations of states and political subdivisions			225,962						1						(32,583)						193,380
Residential mortgage-backed securities			3,541,284						36,238						(63,444)						3,514,078
Corporate and other debt securities			231,876						1,781						(7,328)						226,329
Total			$	4,290,642					$	38,281					$	(126,705)					$	4,202,218
December 31, 2024
U.S. Treasury securities			$	319,551					$	—					$	(28,002)					$	291,549
U.S. government agency securities			24,636						20						(2,113)						22,543
Obligations of states and political subdivisions:
Obligations of states and state agencies			46,211						—						(682)						45,529
Municipal bonds			179,284						—						(32,304)						146,980
Total obligations of states and political subdivisions			225,495						—						(32,986)						192,509
Residential mortgage-backed securities			2,784,895						3,796						(107,615)						2,681,076
Corporate and other debt securities			197,696						247						(15,896)						182,047
Total			$	3,552,273					$	4,063					$	(186,612)					$	3,369,724

Age of Unrealized Losses and Fair Value of Related Available for Sale Debt Securities

The age of unrealized losses and fair value of related AFS debt securities at December 31, 2025 and 2024 were as follows: 

			Less than Twelve Months												More than Twelve Months												Total
			Fair Value						Unrealized Losses						Fair Value						Unrealized Losses						Fair Value						Unrealized Losses
			(in thousands)
December 31, 2025
U.S. Treasury securities			$	—					$	—					$	128,232					$	(22,233)					$	128,232					$	(22,233)
U.S. government agency securities			—						—						20,754						(1,117)						20,754						(1,117)
Obligations of states and political subdivisions:
Obligations of states and state agencies			—						—						5,453						(646)						5,453						(646)
Municipal bonds			—						—						141,083						(31,937)						141,083						(31,937)
Total obligations of states and political subdivisions			—						—						146,536						(32,583)						146,536						(32,583)
Residential mortgage-backed securities			118,263						(234)						650,985						(63,210)						769,248						(63,444)
Corporate and other debt securities			12,741						(9)						132,307						(7,319)						145,048						(7,328)
Total			$	131,004					$	(243)					$	1,078,814					$	(126,462)					$	1,209,818					$	(126,705)
December 31, 2024
U.S. Treasury securities			$	—					$	—					$	291,549					$	(28,002)					$	291,549					$	(28,002)
U.S. government agency securities			—						—						21,281						(2,113)						21,281						(2,113)
Obligations of states and political subdivisions:
Obligations of states and state agencies			—						—						6,208						(682)						6,208						(682)
Municipal bonds			—						—						139,216						(32,304)						139,216						(32,304)
Total obligations of states and political subdivisions			—						—						145,424						(32,986)						145,424						(32,986)
Residential mortgage-backed securities			1,483,442						(22,242)						501,858						(85,373)						1,985,300						(107,615)
Corporate and other debt securities			—						—						166,800						(15,896)						166,800						(15,896)
Total			$	1,483,442					$	(22,242)					$	1,126,912					$	(164,370)					$	2,610,354					$	(186,612)

Contractual Maturities of Available for Sale Debt Securities

The contractual maturities of AFS debt securities at December 31, 2025 are set forth in the following table. Contractual maturities may differ from actual maturities as borrowers may have the right to call or repay obligations with or without call or prepayment penalties. Residential mortgage-backed securities are not included in the maturity categories in the following maturity summary as actual maturities may differ from contractual maturities because the underlying mortgages may be called or prepaid without penalties. 

			December 31, 2025
			Amortized Cost						Fair Value
			(in thousands)
Due in one year			$	987					$	981
Due after one year through five years			224,894						222,934
Due after five years through ten years			235,455						228,609
Due after ten years			288,022						235,616
Residential mortgage-backed securities			3,541,284						3,514,078
Total			$	4,290,642					$	4,202,218

Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Debt Securities Held to Maturity

The amortized cost, gross unrealized gains and losses and fair value of HTM debt securities at December 31, 2025 and 2024 were as follows: 

			Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value						Allowance for Credit Losses						Net Carrying Value
			(in thousands)
December 31, 2025
U.S. government agency securities			$	292,269					$	19					$	(39,226)					$	253,062					$	—					$	292,269
Obligations of states and political subdivisions:
Obligations of states and state agencies			60,801						504						(3,293)						58,012						2						60,799
Municipal bonds			293,074						43						(17,295)						275,822						134						292,940
Total obligations of states and political subdivisions			353,875						547						(20,588)						333,834						136						353,739
Residential mortgage-backed securities			2,732,752						11,050						(311,815)						2,431,987						—						2,732,752
Trust preferred securities			36,103						—						(5,414)						30,689						425						35,678
Corporate and other debt securities			81,572						—						(1,541)						80,031						173						81,399
Total			$	3,496,571					$	11,616					$	(378,584)					$	3,129,603					$	734					$	3,495,837
December 31, 2024
U.S. Treasury securities			$	25,480					$	—					$	(19)					$	25,461					$	—					$	25,480
U.S. government agency securities			301,315						—						(49,013)						252,302						—						301,315
Obligations of states and political subdivisions:
Obligations of states and state agencies			68,025						—						(5,335)						62,690						2						68,023
Municipal bonds			304,464						9						(20,802)						283,671						48						304,416
Total obligations of states and political subdivisions			372,489						9						(26,137)						346,361						50						372,439
Residential mortgage-backed securities			2,710,642						2,088						(420,582)						2,292,148						—						2,710,642
Trust preferred securities			36,081						—						(6,936)						29,145						414						35,667
Corporate and other debt securities			86,213						10						(3,356)						82,867						183						86,030
Total			$	3,532,220					$	2,107					$	(506,043)					$	3,028,284					$	647					$	3,531,573

Age of Unrealized Losses and Fair Value of Related Debt Securities Held to Maturity

The age of unrealized losses and fair value of related HTM debt securities at December 31, 2025 and 2024 were as follows:

			Less than Twelve Months												More than Twelve Months												Total
			Fair Value						Unrealized Losses						Fair Value						Unrealized Losses						Fair Value						Unrealized Losses
			(in thousands)
December 31, 2025
U.S. government agency securities			$	—					$	—					$	235,027					$	(39,226)					$	235,027					$	(39,226)
Obligations of states and political subdivisions:
Obligations of states and state agencies			8,974						(161)						32,537						(3,132)						41,511						(3,293)
Municipal bonds			18,237						(1,777)						176,687						(15,518)						194,924						(17,295)
Total obligations of states and political subdivisions			27,211						(1,938)						209,224						(18,650)						236,435						(20,588)
Residential mortgage-backed securities			23,866						(152)						1,837,989						(311,663)						1,861,855						(311,815)
Trust preferred securities			—						—						30,689						(5,414)						30,689						(5,414)
Corporate and other debt securities			10,471						(29)						64,560						(1,512)						75,031						(1,541)
Total			$	61,548					$	(2,119)					$	2,377,489					$	(376,465)					$	2,439,037					$	(378,584)
December 31, 2024
U.S. Treasury securities			$	25,461					$	(19)					$	—					$	—					$	25,461					$	(19)
U.S. government agency securities			22,621						(75)						229,143						(48,938)						251,764						(49,013)
Obligations of states and political subdivisions:
Obligations of states and state agencies			20,632						(517)						42,058						(4,818)						62,690						(5,335)
Municipal bonds			36,766						(440)						210,723						(20,362)						247,489						(20,802)
Total obligations of states and political subdivisions			57,398						(957)						252,781						(25,180)						310,179						(26,137)
Residential mortgage-backed securities			216,651						(2,687)						1,917,644						(417,895)						2,134,295						(420,582)
Trust preferred securities			—						—						29,145						(6,936)						29,145						(6,936)
Corporate and other debt securities			5,977						(23)						63,879						(3,333)						69,856						(3,356)
Total			$	328,108					$	(3,761)					$	2,492,592					$	(502,282)					$	2,820,700					$	(506,043)

Contractual Maturities of Investments Debt Securities Held to Maturity

The contractual maturities of investments in HTM debt securities at December 31, 2025 are set forth in the table below. Contractual maturities may differ from actual maturities as borrowers may have the right to call or repay obligations with or without call or prepayment penalties. Residential mortgage-backed securities are not included in the maturity categories in the following maturity summary as actual maturities may differ from contractual maturities because the underlying mortgages may be called or prepaid without penalties. 

			December 31, 2025
			Amortized Cost						Fair Value
			(in thousands)
Due in one year			$	49,575					$	49,361
Due after one year through five years			33,202						33,124
Due after five years through ten years			156,014						150,240
Due after ten years			525,028						464,891
Residential mortgage-backed securities			2,732,752						2,431,987
Total			$	3,496,571					$	3,129,603

Amortized Cost of Held to Maturity Debt Securities by External Credit Rating

The following table summarizes the amortized cost of HTM debt securities by external credit rating at December 31, 2025 and 2024.

			AAA/AA/A Rated						BBB rated												Non-rated						Total
			(in thousands)
December 31, 2025
U.S. government agency securities			$	292,269					$	—											$	—					$	292,269
Obligations of states and political subdivisions:
Obligations of states and state agencies			47,458						—												13,343						60,801
Municipal bonds			239,905						—												53,169						293,074
Total obligations of states and political subdivisions			287,363						—												66,512						353,875
Residential mortgage-backed securities			2,732,752						—												—						2,732,752
Trust preferred securities			—						—												36,103						36,103
Corporate and other debt securities			—						3,000												78,572						81,572
Total			$	3,312,384					$	3,000											$	181,187					$	3,496,571
December 31, 2024
U.S. Treasury securities			$	25,480					$	—											$	—					$	25,480
U.S. government agency securities			301,315						—												—						301,315
Obligations of states and political subdivisions:
Obligations of states and state agencies			52,770						—												15,255						68,025
Municipal bonds			277,921						—												26,543						304,464
Total obligations of states and political subdivisions			330,691						—												41,798						372,489
Residential mortgage-backed securities			2,710,642						—												—						2,710,642
Trust preferred securities									—												36,081						36,081
Corporate and other debt securities			—						6,000												80,213						86,213
Total			$	3,368,128					$	6,000											$	158,092					$	3,532,220

Debt Securities, Held-to-maturity, Allowance for Credit Loss

HTM debt securities are carried net of an allowance for credit losses. The following table details the activity in the allowance for credit losses for the years ended December 31, 2025, 2024 and 2023: 

			2025						2024						2023
			(in thousands)
Beginning balance			$	647					$	1,205					$	1,646
Provision (credit) for credit losses			87						(558)						(441)
Ending balance			$	734					$	647					$	1,205

Gross Gains and Losses Realized on Sales, Maturities, and Other Securities Transactions

Gross gains and losses realized on sales, maturities and other securities transactions related to AFS securities and net gains and losses on trading debt securities included in earnings for the years ended December 31, 2025, 2024 and 2023 were as follows:

			2025						2024						2023
			(in thousands)
Sales transactions:
Gross gains			$	—					$	—					$	869
Total			—						—						869
Maturities and other securities transactions:
Gross gains			29						3						21
Gross losses			(12)						(18)						(488)
Total			17						(15)						(467)
Net gains on trading debt securities			57						115						702
Gains on securities transactions, net			$	74					$	100					$	1,104

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Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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