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DEBT SECURITIES (Tables)
 3 Months Ended
Mar. 31, 2026
Investments, Debt and Equity Securities [Abstract]  
Schedule of Debt Securities, Available-for-Sale
The following table presents the amortized cost and fair value of the debt securities portfolio as of the dates indicated:
March 31, 2026
(in thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
Securities available-for-sale
Obligations of states and political subdivisions$454,978 $6,612 $(1,721)$459,869 
Mortgage-backed securities - residential2,818,727 20,363 (31,371)2,807,719 
Mortgage-backed securities - commercial369,056 1,210 (12,285)357,981 
Collateralized loan obligations230,500 — (792)229,708 
Corporate bonds52,028 985 (1,878)51,135 
U.S. Treasury securities20,648 — (112)20,536 
Agency debentures6,816 — (59)6,757 
Total securities available-for-sale$3,952,753 $29,170 $(48,218)$3,933,705 
(in thousands)Amortized CostGross Unrecognized GainsGross Unrecognized LossesFair Value
Securities held-to-maturity
Obligations of states and political subdivisions$12,967 $401 $(9)$13,359 
Mortgage-backed securities - residential989,514 — (132,144)857,370 
Mortgage-backed securities - commercial311,039 — (31,799)279,240 
Total securities held-to-maturity$1,313,520 $401 $(163,952)$1,149,969 
December 31, 2025
(in thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
Securities available-for-sale
Obligations of states and political subdivisions$458,290 $13,518 $(649)$471,159 
Mortgage-backed securities - residential2,871,733 36,881 (24,325)2,884,289 
Mortgage-backed securities - commercial381,934 1,622 (11,750)371,806 
Collateralized loan obligations188,500 1 (185)188,316 
Corporate bonds51,828 527 (2,440)49,915 
U.S. Treasury securities20,623 46 — 20,669 
Agency debentures7,243 9 (21)7,231 
Total securities available-for-sale$3,980,151 $52,604 $(39,370)$3,993,385 
(in thousands)Amortized CostGross Unrecognized GainsGross Unrecognized LossesFair Value
Securities held-to-maturity
Obligations of states and political subdivisions$12,902 $545 $(6)$13,441 
Mortgage-backed securities - residential1,012,716 — (134,994)877,722 
Mortgage-backed securities - commercial311,014 — (31,359)279,655 
Total securities held-to-maturity$1,336,632 $545 $(166,359)$1,170,818 
Schedule of Amortized Cost and Fair Value of Held-to-Maturity Securities
The following table presents the amortized cost and fair value of the debt securities portfolio as of the dates indicated:
March 31, 2026
(in thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
Securities available-for-sale
Obligations of states and political subdivisions$454,978 $6,612 $(1,721)$459,869 
Mortgage-backed securities - residential2,818,727 20,363 (31,371)2,807,719 
Mortgage-backed securities - commercial369,056 1,210 (12,285)357,981 
Collateralized loan obligations230,500 — (792)229,708 
Corporate bonds52,028 985 (1,878)51,135 
U.S. Treasury securities20,648 — (112)20,536 
Agency debentures6,816 — (59)6,757 
Total securities available-for-sale$3,952,753 $29,170 $(48,218)$3,933,705 
(in thousands)Amortized CostGross Unrecognized GainsGross Unrecognized LossesFair Value
Securities held-to-maturity
Obligations of states and political subdivisions$12,967 $401 $(9)$13,359 
Mortgage-backed securities - residential989,514 — (132,144)857,370 
Mortgage-backed securities - commercial311,039 — (31,799)279,240 
Total securities held-to-maturity$1,313,520 $401 $(163,952)$1,149,969 
December 31, 2025
(in thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
Securities available-for-sale
Obligations of states and political subdivisions$458,290 $13,518 $(649)$471,159 
Mortgage-backed securities - residential2,871,733 36,881 (24,325)2,884,289 
Mortgage-backed securities - commercial381,934 1,622 (11,750)371,806 
Collateralized loan obligations188,500 1 (185)188,316 
Corporate bonds51,828 527 (2,440)49,915 
U.S. Treasury securities20,623 46 — 20,669 
Agency debentures7,243 9 (21)7,231 
Total securities available-for-sale$3,980,151 $52,604 $(39,370)$3,993,385 
(in thousands)Amortized CostGross Unrecognized GainsGross Unrecognized LossesFair Value
Securities held-to-maturity
Obligations of states and political subdivisions$12,902 $545 $(6)$13,441 
Mortgage-backed securities - residential1,012,716 — (134,994)877,722 
Mortgage-backed securities - commercial311,014 — (31,359)279,655 
Total securities held-to-maturity$1,336,632 $545 $(166,359)$1,170,818 
Contractual maturities of securities as of March 31, 2026, were as follows:
March 31, 2026
(in thousands)Within One YearAfter One Through Five YearsAfter Five Through Ten YearsAfter Ten YearsTotal
Securities available-for-sale
Obligations of states and political subdivisions$342 $44,871 $125,131 $289,525 $459,869 
Mortgage-backed securities - residential376 12,295 23,170 2,771,878 2,807,719 
Mortgage-backed securities - commercial2,600 196,499 143,676 15,206 357,981 
Collateralized loan obligations— — — 229,708 229,708 
Corporate bonds— 4,302 46,833 — 51,135 
U.S. Treasury securities— 20,536 — — 20,536 
Agency debentures— 1,109 3,501 2,147 6,757 
Total $3,318 $279,612 $342,311 $3,308,464 $3,933,705 
March 31, 2026
(in thousands)Within One YearAfter One Through Five YearsAfter Five Through Ten YearsAfter Ten YearsTotal
Securities held-to-maturityAmortized CostFair ValueAmortized CostFair ValueAmortized CostFair ValueAmortized CostFair ValueAmortized CostFair Value
Obligations of states and political subdivisions$3,500 $3,500 $3,106 $3,129 $4,708 $4,958 $1,653 $1,772 $12,967 $13,359 
Mortgage-backed securities - residential— — 53 51 — — 989,461 857,319 989,514 857,370 
Mortgage-backed securities - commercial— — 179,638 162,829 131,401 116,411 — — 311,039 279,240 
Total$3,500 $3,500 $182,797 $166,009 $136,109 $121,369 $991,114 $859,091 $1,313,520 $1,149,969 
Schedule of Realized Gain (Loss)
The following table presents proceeds, gross realized gains and gross realized losses from sales and calls of available-for-sale investments:
Quarter Ended March 31,
(in thousands)20262025
Proceeds$1,372 $— 
Gross gains52 — 
Gross losses— — 
Schedule of Unrealized Gain (Loss) on Investments
The following table summarizes available-for-sale securities with unrealized losses at March 31, 2026 and December 31, 2025 aggregated by major security type and length of time in a continuous unrealized loss position:
March 31, 2026
 Less than 12 months12 months or moreTotal
(dollars in thousands)Fair ValueGross Unrealized LossesFair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses
Obligations of states and political subdivisions$124,671 $1,214 $22,600 $507 $147,271 $1,721 
Mortgage-backed securities - residential769,984 5,785 375,934 25,586 1,145,918 31,371 
Mortgage-backed securities - commercial96,247 675 153,402 11,610 249,649 12,285 
Collateralized loan obligations179,708 792 — — 179,708 792 
Corporate bonds1,072 13 28,135 1,865 29,207 1,878 
U.S. Treasury securities20,536 112 — — 20,536 112 
Agency debentures6,757 59 — — 6,757 59 
Total $1,198,975 $8,650 $580,071 $39,568 $1,779,046 $48,218 
Number of securities with unrealized losses261228489
December 31, 2025
 Less than 12 months12 months or moreTotal
(dollars in thousands)Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses
Obligations of states and political subdivisions$27,015 $151 $30,244 $498 $57,259 $649 
Mortgage-backed securities - residential72,234 384 393,915 23,941 466,149 24,325 
Mortgage-backed securities - commercial106,225 405 156,600 11,345 262,825 11,750 
Collateralized loan obligations138,315 185 — — 138,315 185 
Corporate bonds3,543 101 27,661 2,339 31,204 2,440 
Agency debentures4,877 21 — — 4,877 21 
Total$352,209 $1,247 $608,420 $38,123 $960,629 $39,370 
Number of securities with unrealized losses83240323