v3.26.3
INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Investment Holdings [Line Items]    
Total $ 38,321 $ 58,545
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 60
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (5,421) (4,271)
Held-to-Maturity Market Value 32,900 54,334
Total 5,098,396 4,182,075
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 751 20,053
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (463,843) (230,196)
Investment securities available-for-sale 4,635,304 3,971,932
U.S. Treasuries    
Investment Holdings [Line Items]    
Total 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 0 0
Held-to-Maturity Market Value 0 0
Total 100 99
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 0 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (5) (4)
Investment securities available-for-sale 95 95
Securities of U.S. government agencies and corporations    
Investment Holdings [Line Items]    
Total 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 0 0
Held-to-Maturity Market Value 0 0
Total 104,978 0
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 135 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (5,231) 0
Investment securities available-for-sale 99,882 0
Residential Mortgage Backed Securities [Member]    
Investment Holdings [Line Items]    
Total 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 0 0
Held-to-Maturity Market Value 0 0
Total 2,002,626 1,607,916
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 31 11,265
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (199,374) (69,767)
Investment securities available-for-sale 1,803,283 1,549,414
Commercial Mortgage Backed Securities [Member]    
Investment Holdings [Line Items]    
Total 25,732 27,373
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (4,396) (3,392)
Held-to-Maturity Market Value 21,336 23,981
Total 425,734 394,129
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 136 1,212
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (30,792) (13,741)
Investment securities available-for-sale 395,078 381,600
Collateralized Mortgage Backed Securities [Member]    
Investment Holdings [Line Items]    
Total 5,402 6,088
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (710) (499)
Held-to-Maturity Market Value 4,692 5,589
Total 1,084,939 741,819
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 10 3,765
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (78,811) (36,347)
Investment securities available-for-sale 1,006,138 709,237
Obligations of state and other political subdivisions    
Investment Holdings [Line Items]    
Total 7,187 8,334
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 60
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (315) (179)
Held-to-Maturity Market Value 6,872 8,215
Total 771,939 706,668
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 306 931
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (133,628) (89,509)
Investment securities available-for-sale 638,617 618,090
Asset-backed Securities [Member]    
Investment Holdings [Line Items]    
Total 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 0 0
Held-to-Maturity Market Value 0 0
Total 523,108 568,366
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 116 1,817
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (12,294) (13,639)
Investment securities available-for-sale 510,930 556,544
Other securities    
Investment Holdings [Line Items]    
Total 0 16,750
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 0 (201)
Held-to-Maturity Market Value 0 16,549
Total 184,972 163,078
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 17 1,063
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (3,708) (7,189)
Investment securities available-for-sale $ 181,281 $ 156,952