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Investment Securities (Tables)

9 Months Ended

Sep. 30, 2025

Investments, Debt and Equity Securities [Abstract]

Amortized Cost and Fair Value of Securities Available-for-Sale

The following table summarizes the amortized cost and fair value of securities that are classified as available-for-sale and held-to-maturity:

			September 30, 2025
			Available-for-Sale
			Amortized Cost						Allowance for Credit Losses						Net Carrying Amount						Gross Unrealized Gains						Gross Unrealized (Losses)						Estimated Fair Value
			(In thousands)
U.S. government-sponsored enterprises			$	254,741					$	—					$	254,741					$	968					$	(8,394)					$	247,315
U.S. government-sponsored mortgage-backed securities			1,378,237						—						1,378,237						1,360						(138,541)						1,241,056
Private mortgage-backed securities			155,155						—						155,155						163						(7,417)						147,901
Non-government-sponsored asset backed securities			171,752						—						171,752						348						(1,067)						171,033
State and political subdivisions			959,533						—						959,533						1,015						(78,219)						882,329
Other securities			244,462						—						244,462						1,768						(11,368)						234,862
Total			$	3,163,880					$	—					$	3,163,880					$	5,622					$	(245,006)					$	2,924,496

			September 30, 2025
			Held-to-Maturity
			Amortized Cost						Allowance for Credit Losses						Net Carrying Amount						Gross Unrealized Gains						Gross Unrealized (Losses)						Estimated Fair Value
			(In thousands)
U.S. government-sponsored enterprises			$	43,770					$	—					$	43,770					$	—					$	(1,523)					$	42,247
U.S. government-sponsored mortgage-backed securities			118,662						—						118,662						349						(3,366)						115,645
State and political subdivisions			1,103,773						(2,005)						1,101,768						95						(102,636)						999,227
Total			$	1,266,205					$	(2,005)					$	1,264,200					$	444					$	(107,525)					$	1,157,119

			December 31, 2024
			Available-for-Sale
			Amortized Cost						Allowance for Credit Losses						Net Carrying Amount						Gross Unrealized Gains						Gross Unrealized (Losses)						Estimated Fair Value
			(In thousands)
U.S. government-sponsored enterprises			$	297,698					$	—					$	297,698					$	1,164					$	(14,072)					$	284,790
U.S. government-sponsored mortgage-backed securities			1,527,463						—						1,527,463						760						(203,539)						1,324,684
Private mortgage-backed securities			184,643						—						184,643						—						(13,249)						171,394
Non-government-sponsored asset backed securities			228,751												228,751						331						(3,434)						225,648
State and political subdivisions			956,055						—						956,055						335						(86,029)						870,361
Other securities			215,662						(2,195)						213,467						576						(18,281)						195,762
Total			$	3,410,272					$	(2,195)					$	3,408,077					$	3,166					$	(338,604)					$	3,072,639

			December 31, 2024
			Held-to-Maturity
			Amortized Cost						Allowance for Credit Losses						Net Carrying Amount						Gross Unrealized Gains						Gross Unrealized (Losses)						Estimated Fair Value
			(In thousands)
U.S. government-sponsored enterprises			$	43,560					$	—					$	43,560					$	—					$	(3,021)					$	40,539
U.S. government-sponsored mortgage-backed securities			124,169						—						124,169						—						(6,695)						117,474
State and political subdivisions			1,109,480						(2,005)						1,107,475						39						(122,587)						984,927
Total			$	1,277,209					$	(2,005)					$	1,275,204					$	39					$	(132,303)					$	1,142,940

The following table presents the Company's financial assets by level within the fair value hierarchy that were measured at fair value on a recurring basis during the periods ended September 30, 2025 and December 31, 2024 (in thousands):

			September 30, 2025
									Fair Value Measurements
			Fair Value						Level 1						Level 2						Level 3
			(in thousands)
U.S. government-sponsored enterprises			$	247,315					$	—					$	247,315					$	—
U.S. government-sponsored mortgage-backed securities			1,241,056						—						1,241,056						—
Private mortgage-backed securities			147,901						—						147,901						—
Non-government-sponsored asset backed securities			171,033						—						171,033						—
State and political subdivisions			882,329						—						867,014						15,315
Other securities			234,862						—						229,990						4,872
Total			$	2,924,496					$	—					$	2,904,309					$	20,187

			December 31, 2024
									Fair Value Measurements
			Fair Value						Level 1						Level 2						Level 3
			(in thousands)
U.S. government-sponsored enterprises			$	284,790					$	—					$	284,790					$	—
U.S. government-sponsored mortgage-backed securities			1,324,684						—						1,324,684						—
Private mortgage-backed securities			171,394						—						171,394						—
Non-government-sponsored asset backed securities			225,648						—						225,648						—
State and political subdivisions			870,361						—						853,699						16,662
Other securities			195,762						—						190,895						4,867
Total			$	3,072,639					$	—					$	3,051,110					$	21,529

Amortized Cost and Estimated Fair Value of Securities Contractual Maturity

The amortized cost and estimated fair value of securities classified as available-for-sale and held-to-maturity at September 30, 2025, by contractual maturity, are shown below. Expected maturities could differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. Securities not due at a single maturity date are shown separately.

			Available-for-Sale												Held-to-Maturity
			Amortized Cost						Estimated Fair Value						Amortized Cost						Estimated Fair Value
			(In thousands)
Due in one year or less			$	32,853					$	32,425					$	—					$	—
Due after one year through five years			257,956						247,955						104,620						101,940
Due after five years through ten years			394,695						375,621						364,055						338,975
Due after ten years			773,232						708,505						678,868						600,559
U.S. government-sponsored mortgage-backed securities			1,378,237						1,241,056						118,662						115,645
Private mortgage-backed securities			155,155						147,901						—						—
Non-government-sponsored asset backed securities			171,752						171,033						—						—
Total			$	3,163,880					$	2,924,496					$	1,266,205					$	1,157,119

Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value

The following table shows gross unrealized losses and estimated fair value of investment securities classified as available-for-sale and held-to-maturity, aggregated by investment category and length of time that individual investment securities have been in a continuous loss position as of September 30, 2025 and December 31, 2024.

			September 30, 2025
			Less Than 12 Months												12 Months or More												Total
			Fair Value						Unrealized Losses						Fair Value						Unrealized Losses						Fair Value						Unrealized Losses
			(In thousands)
Available-for-sale:
U.S. government-sponsored enterprises			$	16,429					$	(64)					$	164,831					$	(8,330)					$	181,260					$	(8,394)
U.S. government-sponsored mortgage-backed securities			15,657						(22)						1,128,946						(138,519)						1,144,603						(138,541)
Private mortgage-backed securities			—						—						138,047						(7,417)						138,047						(7,417)
Non-government-sponsored asset backed securities			642						(1)						56,007						(1,066)						56,649						(1,067)
State and political subdivisions			28,597						(911)						750,624						(77,308)						779,221						(78,219)
Other securities			11,349						(78)						166,792						(11,290)						178,141						(11,368)
Total			$	72,674					$	(1,076)					$	2,405,247					$	(243,930)					$	2,477,921					$	(245,006)
Held-to-maturity:
U.S. government-sponsored enterprises			$	—					$	—					$	42,247					$	(1,523)					$	42,247					$	(1,523)
U.S. government-sponsored mortgage-backed securities			6,583						(42)						74,627						(3,324)						81,210						(3,366)
State and political subdivisions			12,467						(482)						982,504						(102,154)						994,971						(102,636)
Total			$	19,050					$	(524)					$	1,099,378					$	(107,001)					$	1,118,428					$	(107,525)

			December 31, 2024
			Less Than 12 Months												12 Months or More												Total
			Fair Value						Unrealized Losses						Fair Value						Unrealized Losses						Fair Value						Unrealized Losses
			(In thousands)
Available-for-sale:
U.S. government-sponsored enterprises			$	25,946					$	(326)					$	161,759					$	(13,746)					$	187,705					$	(14,072)
U.S. government-sponsored mortgage-backed securities			34,597						(1,088)						1,215,317						(202,451)						1,249,914						(203,539)
Private mortgage-backed securities			9,491						(129)						161,903						(13,120)						171,394						(13,249)
Non-government-sponsored asset backed securities			10,849						(60)						92,857						(3,374)						103,706						(3,434)
State and political subdivisions			46,591						(1,230)						761,289						(84,799)						807,880						(86,029)
Other securities			7,157						(911)						173,204						(17,370)						180,361						(18,281)
Total			$	134,631					$	(3,744)					$	2,566,329					$	(334,860)					$	2,700,960					$	(338,604)
Held-to-maturity:
U.S. government-sponsored enterprises			$	—					$	—					$	40,539					$	(3,021)					$	40,539					$	(3,021)
U.S. government-sponsored mortgage-backed securities			48,254						(1,979)						69,220						(4,716)						117,474						(6,695)
State and political subdivisions			29,612						(1,037)						954,335						(121,550)						983,947						(122,587)
Total			$	77,866					$	(3,016)					$	1,064,094					$	(129,287)					$	1,141,960					$	(132,303)

Debt Securities, Available-for-Sale, Allowance for Credit Loss

Available-for-Sale Investment Securities
			September 30, 2025						December 31, 2024
Allowance for credit losses:			(In thousands)
Beginning balance, January 1			$	2,195					$	2,525
Recovery of credit losses			(2,195)						(330)
Balance, September 30			$	—					$	2,195
Recovery of credit loss									—
Balance, December 31, 2024									$	2,195

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

Held-to-Maturity Investment Securities
			September 30, 2025						December 31, 2024
Allowance for credit losses:			(In thousands)
Beginning balance, January 1			$	2,005					$	2,005
Provision for credit losses			—						—
Balance, September 30			$	2,005					$	2,005
Provision for credit loss									—
Balance, December 31, 2024									$	2,005

Held-to-Maturity Securities Credit Quality Indicators

The following table summarizes bond ratings for the Company’s held-to-maturity portfolio, based upon amortized cost, issued by state and political subdivisions and other securities as of September 30, 2025:

			State and political subdivisions						U.S. government-sponsored enterprises						U.S. government-sponsored mortgage-backed securities						Total
			(In thousands)
Aaa/AAA			$	233,372					$	43,770					$	—					$	277,142
Aa/AA			832,351						—						—						832,351
A			32,589						—						—						32,589
Not rated			5,461						—						—						5,461
Agency Backed			—						—						118,662						118,662
Total			$	1,103,773					$	43,770					$	118,662					$	1,266,205

Schedule of Income Earned on Available-for Sale Securities

Income earned on securities for the three and nine months ended September 30, 2025 and 2024, is as follows:

			Three Months Ended September 30,												For the Nine Months Ended September 30,
			2025						2024						2025						2024
			(In thousands)
Taxable
Available-for-sale			$	18,899					$	23,550					$	57,991					$	74,439
Held-to-maturity			7,427						7,456						22,212						22,383
Non-taxable
Available-for-sale			4,706						4,612						13,865						13,971
Held-to-maturity			3,037						3,092						9,154						9,305
Total			$	34,069					$	38,710					$	103,222					$	120,098

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