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DEBT SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost, Unrealized Gains and Losses, and Fair Values of Securities Classified as AFS and HTM
The tables below provides the amortized cost, unrealized and unrecognized gains and losses, and fair values of debt securities, summarized by major category (dollars in thousands):
As of December 31, 2024
Amortized
Cost		UnrealizedFair
Value
Gross GainsGross Losses
Debt securities available for sale
Obligations of U.S. government corporations and agencies
$1,408 $— $(8)$1,400 
Obligations of states and political subdivisions1
156,534 31 (16,736)139,829 
Asset-backed securities1
336,379 181 (3)336,557 
Commercial mortgage-backed securities
107,305 — (15,131)92,174 
Residential mortgage-backed securities
1,279,090 19 (191,899)1,087,210 
Corporate debt securities
159,236 363 (6,548)153,051 
Total debt securities available for sale
$2,039,952 $594 $(230,325)$1,810,221 
Amortized
Cost		UnrecognizedFair
Value
Gross GainsGross Losses
Debt securities held to maturity
Commercial mortgage-backed securities
$415,530 $— $(77,242)$338,288 
Residential mortgage-backed securities
411,100 — (74,335)336,765 
Total debt securities held to maturity
$826,630 $— $(151,577)$675,053 
___________________________________________
1.Includes securities marked at par, with no gain or loss to report.
As of December 31, 2023
Amortized
Cost		UnrealizedFair
Value
Gross GainsGross Losses
Debt securities available for sale
U.S. Treasury securities
$16,031 $— $(85)$15,946 
Obligations of U.S. government corporations and agencies
5,889 1 (58)5,832 
Obligations of states and political subdivisions1
190,819 52 (18,026)172,845 
Asset-backed securities
470,046 — (1,823)468,223 
Commercial mortgage-backed securities
119,044 — (15,535)103,509 
Residential mortgage-backed securities
1,306,854 5 (195,547)1,111,312 
Corporate debt securities
225,947 128 (16,171)209,904 
Total debt securities available for sale
$2,334,630 $186 $(247,245)$2,087,571 
Amortized
Cost		UnrecognizedFair
Value
Gross GainsGross Losses
Debt securities held to maturity
Commercial mortgage-backed securities
$428,526 $— $(71,000)$357,526 
Residential mortgage-backed securities
444,102 — (71,231)372,871 
Total debt securities held to maturity
$872,628 $— $(142,231)$730,397 
___________________________________________
1.Includes securities marked at par, with no gain or loss to report.
Schedule of Maturities Of Debt Securities All mortgage-backed securities were issued by U.S. government corporations and agencies (dollars in thousands):
As of December 31, 2024
Amortized
Cost		Fair
Value
Debt securities available for sale
Due in one year or less$91,497 $90,406 
Due after one year through five years110,271 104,914 
Due after five years through ten years518,414 495,024 
Due after ten years1,319,770 1,119,877 
Debt securities available for sale$2,039,952 $1,810,221 
 
Debt securities held to maturity
Due in one year or less$18,628 $18,327 
Due after one year through five years62,119 58,733 
Due after five years through ten years14,689 12,609 
Due after ten years731,194 585,384 
Debt securities held to maturity$826,630 $675,053 
Schedule of Gains and Losses on Debt Securities Available for Sale
Realized gains and losses related to sales and calls of debt securities available for sale are summarized as follows (dollars in thousands):
Years Ended December 31,
202420232022
Realized gains and losses on debt securities
Gross gains on debt securities$1 $20 $115 
Gross (losses) on debt securities(7,034)(5,523)(89)
Realized net gains (losses) on debt securities1
$(7,033)$(5,503)$26 
___________________________________________
1.Net gains (losses) on sales of securities reported on the Consolidated Statements of Income include the sale of equity securities, excluded in this table.
Schedule of Debt Securities in an Unrealized or Unrecognized Loss Position
The following information pertains to debt securities with gross unrealized or unrecognized losses, aggregated by investment category and the length of time that individual securities have been in a continuous loss position (dollars in thousands):
As of December 31, 2024
Less than 12 months12 months or moreTotal
Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
Debt securities available for sale
Obligations of U.S. government corporations and agencies$— $— $1,328 $(8)$1,328 $(8)
Obligations of states and political subdivisions11,234 (209)119,723 (16,527)130,957 (16,736)
Asset-backed securities14,997 (3)— — 14,997 (3)
Commercial mortgage-backed securities6,238 (42)85,936 (15,089)92,174 (15,131)
Residential mortgage-backed securities152,081 (640)930,642 (191,259)1,082,723 (191,899)
Corporate debt securities598 (1)143,966 (6,547)144,564 (6,548)
Debt securities available for sale with gross unrealized losses$185,148 $(895)$1,281,595 $(229,430)$1,466,743 $(230,325)
12 months or moreTotal
Fair
Value		Unrecognized
Losses		Fair
Value		Unrecognized
Losses
Debt securities held to maturity
Commercial mortgage-backed securities$338,288 $(77,242)$338,288 $(77,242)
Residential mortgage-backed securities336,765 (74,335)336,765 (74,335)
Debt securities held to maturity with gross unrecognized losses$675,053 $(151,577)$675,053 $(151,577)
As of December 31, 2023
Less than 12 months12 months or moreTotal
Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
Debt securities available for sale
U.S. Treasury securities
$— $— $15,946 $(85)$15,946 $(85)
Obligations of U.S. government corporations and agencies
— — 5,709 (58)5,709 (58)
Obligations of states and political subdivisions
11,442 (54)146,797 (17,972)158,239 (18,026)
Asset-backed securities
— — 468,223 (1,823)468,223 (1,823)
Commercial mortgage-backed securities
— — 103,509 (15,535)103,509 (15,535)
Residential mortgage-backed securities
141 (1)1,110,906 (195,546)1,111,047 (195,547)
Corporate debt securities
1,450 (10)198,694 (16,161)200,144 (16,171)
Debt securities available for sale with gross unrealized losses
$13,033 $(65)$2,049,784 $(247,180)$2,062,817 $(247,245)
12 months or moreTotal
Fair
Value		Unrecognized
Losses		Fair
Value		Unrecognized
Losses
Debt securities held to maturity
Commercial mortgage-backed securities$357,526 $(71,000)$357,526 $(71,000)
Residential mortgage-backed securities372,871 (71,231)372,871 (71,231)
Debt securities held to maturity with gross unrecognized losses$730,397 $(142,231)$730,397 $(142,231)
Additional information about debt securities in an unrealized or unrecognized loss position is presented in the tables below (dollars in thousands):
As of December 31, 2024
Available for Sale Held to Maturity Total
Debt securities with gross unrealized or unrecognized losses, fair value$1,466,743 $675,053 $2,141,796 
Gross unrealized or unrecognized losses on debt securities230,325 151,577 381,902 
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses15.7 %22.5 %17.8 %
 
Count of debt securities677 55 732 
Count of debt securities in an unrealized or unrecognized loss position586 55 641 
As of December 31, 2023
Available for Sale Held to MaturityTotal
Debt securities with gross unrealized or unrecognized losses, fair value$2,062,817 $730,397 $2,793,214 
Gross unrealized or unrecognized losses on debt securities247,245 142,231 389,476 
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses12.0 %19.5 %13.9 %
 
Count of debt securities835 55 890 
Count of debt securities in an unrealized or unrecognized loss position779 55 834