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INVESTMENT SECURITIES (Tables)

12 Months Ended

Dec. 31, 2024

Investments, Debt and Equity Securities [Abstract]

Schedule of Amortized Cost, Gross Unrealized Gains, Gross Unrealized Losses and Approximate Fair Value of Investment Securities

The following table summarizes the amortized cost, gross unrealized gains and losses and approximate fair value of investment securities available for sale as of December 31, 2024 and December 31, 2023.

			Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value
Available for sale at December 31, 2024
U.S. Government-sponsored agency securities			$	95,462					$	—					$	16,081					$	79,381
State and municipal			996,541						19						133,386						863,174
U.S. Government-sponsored mortgage-backed securities			519,943						403						88,724						431,622
Corporate obligations			12,960						—						662						12,298
Total available for sale			$	1,624,906					$	422					$	238,853					$	1,386,475

			Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value
Available for sale at December 31, 2023
U.S. Government-sponsored agency securities			$	111,521					$	—					$	16,214					$	95,307
State and municipal			1,181,029						364						116,222						1,065,171
U.S. Government-sponsored mortgage-backed securities			541,343						462						86,990						454,815
Corporate obligations			12,947						—						1,128						11,819
Total available for sale			$	1,846,840					$	826					$	220,554					$	1,627,112

The following table summarizes the amortized cost, gross unrealized gains and losses, approximate fair value and allowance for credit losses on investment securities held to maturity as of December 31, 2024 and December 31, 2023.

			Amortized Cost						Allowance for Credit Losses						Net Carrying Amount						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value
Held to maturity at December 31, 2024
U.S. Government-sponsored agency securities			$	345,531					$	—					$	345,531					$	—					$	63,112					$	282,419
State and municipal			1,085,921						245						1,085,676						299						185,784						900,436
U.S. Government-sponsored mortgage-backed securities			641,513						—						641,513						—						102,343						539,170
Foreign investment			1,500						—						1,500						—						5						1,495
Total held to maturity			$	2,074,465					$	245					$	2,074,220					$	299					$	351,244					$	1,723,520

			Amortized Cost						Allowance for Credit Losses						Net Carrying Amount						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value
Held to maturity at December 31, 2023
U.S. Government-sponsored agency securities			$	374,002					$	—					$	374,002					$	—					$	64,159					$	309,843
State and municipal			1,099,201						245						1,098,956						1,625						152,113						948,713
U.S. Government-sponsored mortgage-backed securities			709,794						—						709,794						—						99,448						610,346
Foreign investment			1,500						—						1,500						—						28						1,472
Total held to maturity			$	2,184,497					$	245					$	2,184,252					$	1,625					$	315,748					$	1,870,374

Schedule of Amortized Cost of Investment Securities Held to Maturity Aggregated by Credit Quality Indicator

On a quarterly basis, the Corporation monitors the credit quality of investment securities held to maturity through the use of credit ratings. The following table summarizes the amortized cost of investment securities held to maturity at December 31, 2024, aggregated by credit quality indicator.

			Held to Maturity
			U.S. Government-sponsored agency securities (1)						State and municipal						U.S. Government-sponsored mortgage-backed securities (1)						Foreign investment						Total
Credit Rating:
Aaa			$	345,531					$	120,801					$	641,513					$	—					$	1,107,845
Aa1			—						148,923						—						—						148,923
Aa2			—						184,341						—						—						184,341
Aa3			—						185,166						—						—						185,166
A1			—						65,665						—						—						65,665
A2			—						20,317						—						—						20,317
Non-rated			—						360,708						—						1,500						362,208
Total			$	345,531					$	1,085,921					$	641,513					$	1,500					$	2,074,465

(1) U.S. Government agency securities and U.S. Government mortgage-backed securities are included within the Aaa credit rating category due to their explicit or implicit government guarantees, which provide a high level of assurance regarding the timely collection of principal and interest payments.

Schedule of Investment Securities in a Continuous Unrealized Loss Position

The following tables summarize, as of December 31, 2024 and December 31, 2023, investment securities available for sale in an unrealized loss position for which an allowance for credit losses has not been recorded, aggregated by security type and length of time in a continuous unrealized loss position.

			Less than 12 Months												12 Months or Longer												Total
			Fair Value						Gross Unrealized Losses						Fair Value						Gross Unrealized Losses						Fair Value						Gross Unrealized Losses
Investment securities available for sale at December 31, 2024
U.S. Government-sponsored agency securities			$	—					$	—					$	79,381					$	16,081					$	79,381					$	16,081
State and municipal			40,398						2,115						820,663						131,271						861,061						133,386
U.S. Government-sponsored mortgage-backed securities			82,724						1,660						318,310						87,064						401,034						88,724
Corporate obligations			—						—						12,268						662						12,268						662
Total investment securities available for sale			$	123,122					$	3,775					$	1,230,622					$	235,078					$	1,353,744					$	238,853

			Less than 12 Months												12 Months or Longer												Total
			Fair Value						Gross Unrealized Losses						Fair Value						Gross Unrealized Losses						Fair Value						Gross Unrealized Losses
Investment securities available for sale at December 31, 2023
U.S. Government-sponsored agency securities			$	—					$	—					$	95,307					$	16,214					$	95,307					$	16,214
State and municipal			55,514						1,076						963,584						115,146						1,019,098						116,222
U.S. Government-sponsored mortgage-backed securities			11,493						25						422,868						86,965						434,361						86,990
Corporate obligations			—						—						11,788						1,128						11,788						1,128
Total investment securities available for sale			$	67,007					$	1,101					$	1,493,547					$	219,453					$	1,560,554					$	220,554

The following table summarizes investment securities available for sale in an unrealized loss position for which an allowance for credit losses has not been recorded, aggregated by security type and the number of securities in the portfolio as of the dates indicated.

			Gross Unrealized Losses						Number of Securities
Investment securities available for sale at December 31, 2024
U.S. Government-sponsored agency securities			$	16,081					12
State and municipal			133,386						611
U.S. Government-sponsored mortgage-backed securities			88,724						127
Corporate obligations			662						10
Total investment securities available for sale			$	238,853					760

			Gross Unrealized Losses						Number of Securities
Investment securities available for sale at December 31, 2023
U.S. Government-sponsored agency securities			$	16,214					14
State and municipal			116,222						691
U.S. Government-sponsored mortgage-backed securities			86,990						150
Corporate obligations			1,128						10
Total investment securities available for sale			$	220,554					865

Schedule of Investments in Debt and Equity Securities Reported in the Financial Statements at an Amount Less Than Their Historical Cost

Certain investment securities available for sale are reported in the financial statements at an amount less than their historical cost as indicated in the table below.

			December 31, 2024						December 31, 2023
Investments available for sale reported at less than historical cost:
Historical cost			$	1,592,597					$	1,781,108
Fair value			1,353,744						1,560,554
Gross unrealized losses			$	238,853					$	220,554
Percent of the Corporation's investments available for sale in an unrealized loss position			97.6		%				95.9		%

Schedule of Amortized Cost and Fair Value of Available for Sale Securities and Held to Maturity Securities by Contractual Maturity

The amortized cost and fair value of investment securities available for sale and held to maturity at December 31, 2024 and December 31, 2023, by contractual maturity are shown below. Expected maturities will 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 are shown separately.

			Available for Sale												Held to Maturity
			Amortized Cost						Fair Value						Amortized Cost						Fair Value
Maturity Distribution at December 31, 2024
Due in one year or less			$	1,800					$	1,795					$	5,268					$	5,254
Due after one through five years			12,189						11,857						124,004						117,999
Due after five through ten years			168,338						151,467						174,533						154,533
Due after ten years			922,636						789,734						1,129,147						906,564
			1,104,963						954,853						1,432,952						1,184,350
U.S. Government-sponsored mortgage-backed securities			519,943						431,622						641,513						539,170
Total Investment Securities			$	1,624,906					$	1,386,475					$	2,074,465					$	1,723,520

			Available for Sale												Held to Maturity
			Amortized Cost						Fair Value						Amortized Cost						Fair Value
Maturity Distribution at December 31, 2023
Due in one year or less			$	1,390					$	1,382					$	3,041					$	3,043
Due after one through five years			24,899						23,372						118,592						111,723
Due after five through ten years			127,948						120,385						135,805						126,461
Due after ten years			1,151,260						1,027,158						1,217,265						1,018,801
			1,305,497						1,172,297						1,474,703						1,260,028
U.S. Government-sponsored mortgage-backed securities			541,343						454,815						709,794						610,346
Total Investment Securities			$	1,846,840					$	1,627,112					$	2,184,497					$	1,870,374

Schedule of Gross Gains on Sales and Redemptions of Available for Sale Securities

Gross gains and losses on the sales of investment securities available for sale for the years indicated are shown below.

			2024						2023						2022
Sales and redemptions of investment securities available for sale:
Gross gains			$	8					$	759					$	1,264
Gross losses			(20,765)						(7,689)						(70)
Net gains (losses) of sales and redemptions of investment securities available for sale			$	(20,757)					$	(6,930)					$	1,194

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