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Investment Securities (Tables)

12 Months Ended

Dec. 31, 2025

Investments, Debt and Equity Securities [Abstract]

Summary of Amortized Cost and Estimated Fair Values of Available for Sale Securities

Securities held for indefinite periods of time are classified as available for sale and carried at estimated fair value. The amortized cost and estimated fair values of securities available for sale are summarized as follows.

		December 31, 2025
						Gross				Gross				Allowance				Estimated
(Dollars in thousands)		Amortized				Unrealized				Unrealized				For Credit				Fair
		Cost				Gains				Losses				Losses				Value
U.S. Treasury securities and obligations of U.S. Government corporations and agencies		$	283,058			$	75			$	1,476			$	0			$	281,657
State and political subdivisions			572,217				343				55,634				0				516,926
Residential mortgage-backed securities Agency			1,467,436				5,517				114,317				0				1,358,636
Non-agency			42,792				330				4,237				0				38,885
Commercial mortgage-backed securities Agency			416,177				4,948				26,052				0				395,073
Asset-backed securities			225,617				18				2,381				0				223,254
Single issue trust preferred securities			13,319				0				661				0				12,658
Other corporate securities			244,244				0				11,881				0				232,363
Total		$	3,264,860			$	11,231			$	216,639			$	0			$	3,059,452

		December 31, 2024
(Dollars in thousands)		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Allowance For Credit Losses				Estimated Fair Value
U.S. Treasury securities and obligations of U.S. Government corporations and agencies		$	248,867			$	59			$	3,084			$	0			$	245,842
State and political subdivisions			574,580				8				79,515				0				495,073
Residential mortgage-backed securities Agency			1,226,400				433				167,114				0				1,059,719
Non-agency			88,392				262				6,531				0				82,123
Commercial mortgage-backed securities
Agency			372,646				38				42,698				0				329,986
Asset-backed securities			476,863				166				2,047				0				474,982
Single issue trust preferred securities			13,296				0				1,377				0				11,919
Other corporate securities			281,646				0				21,571				0				260,075
Total		$	3,282,690			$	966			$	323,937			$	0			$	2,959,719

Summary of Securities Available for Sale in an Unrealized Loss Position

The following is a summary of securities available for sale which were in an unrealized loss position at December 31, 2025 and December 31, 2024.

		Less than 12 months								12 months or longer								Total
		Fair				Unrealized				Fair				Unrealized				Fair				Unrealized
(Dollars in thousands)		Value				Losses				Value				Losses				Value				Losses
December 31, 2025
U.S. Treasury securities and obligations of U.S. Government corporations and agencies		$	133			$	1			$	31,485			$	1,475			$	31,618			$	1,476
State and political subdivisions			6,177				543				483,564				55,091				489,741				55,634
Residential mortgage-backed securities
Agency			109,848				270				795,183				114,047				905,031				114,317
Non-agency			0				0				21,189				4,237				21,189				4,237
Commercial mortgage-backed securities
Agency			6,287				4				293,038				26,048				299,325				26,052
Asset-backed securities			50,181				154				136,940				2,227				187,121				2,381
Single issue trust preferred securities			0				0				12,658				661				12,658				661
Other corporate securities			0				0				224,942				11,881				224,942				11,881
Total		$	172,626			$	972			$	1,998,999			$	215,667			$	2,171,625			$	216,639

		Less than 12 months								12 months or longer								Total
		Fair				Unrealized				Fair				Unrealized				Fair				Unrealized
(Dollars in thousands)		Value				Losses				Value				Losses				Value				Losses
December 31, 2024
U.S. Treasury securities and obligations of U.S. Government corporations and agencies		$	1,476			$	3			$	42,886			$	3,081			$	44,362			$	3,084
State and political subdivisions			3,314				22				479,681				79,493				482,995				79,515
Residential mortgage-backed securities
Agency			128,655				1,660				856,448				165,454				985,103				167,114
Non-agency			0				0				59,668				6,531				59,668				6,531
Commercial mortgage-backed securities
Agency			0				0				319,506				42,698				319,506				42,698
Asset-backed securities			83,188				50				215,886				1,997				299,074				2,047
Single issue trust preferred securities			0				0				11,919				1,377				11,919				1,377
Other corporate securities			2,476				24				252,634				21,547				255,110				21,571
Total		$	219,109			$	1,759			$	2,238,628			$	322,178			$	2,457,737			$	323,937

Summary of Gains or Losses on Proceeds from Maturities, Sales and Calls of Available for Sale Securities by Specific Identification Method

The following table shows the proceeds from maturities, sales and calls of available for sale securities and the gross realized gains and losses on sales and calls of those securities that have been included in earnings as a result of any sales and calls. Gains or losses on sales and calls of available for sale securities were recognized by the specific identification method.

		Year Ended
(In thousands)		2025				2024				2023
Proceeds from maturities, sales and calls		$	2,260,860			$	2,914,095			$	952,213
Gross realized gains			0				0				0
Gross realized losses			0				16,296				7,659

Summary of Maturities of Debt Securities Held to Maturity by Amortized Cost and Estimated Fair Value

(In thousands)		Amortized Cost				Estimated Fair Value
									Due in one year or less		$	298,573			$	298,193
									Due after one year through five years			527,383				494,204
Due after five years through ten years			559,647				521,011
Due after ten years			1,879,257				1,746,044
Total		$	3,264,860			$	3,059,452

Summary of Equity Securities

		Year Ended
(In thousands)		December 31, 2025				December 31, 2024
Net gains recognized during the period on equity securities sold		$	0			$	4,602
Unrealized gains recognized during the period on equity securities still held at period end			11,445				4,259
Unrealized losses recognized during the period on equity securities still held at period end			(275	)			(285	)
Net gains recognized during the period		$	11,170			$	8,576

X

- Definition

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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