v3.26.1
INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Investment Holdings [Line Items]    
Total $ 49,631 $ 58,545
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 50 60
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (4,308) (4,271)
Held-to-Maturity Market Value 45,373 54,334
Total 5,198,638 4,182,075
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 8,466 20,053
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (254,081) (230,196)
Investment securities available-for-sale 4,953,023 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 10,143 99
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 0 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (15) (4)
Investment securities available-for-sale 10,128 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 82,303 0
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 121 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (249) 0
Investment securities available-for-sale 82,175 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 2,008,226 1,607,916
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 3,318 11,265
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (82,957) (69,767)
Investment securities available-for-sale 1,928,587 1,549,414
Commercial Mortgage Backed Securities [Member]    
Investment Holdings [Line Items]    
Total 26,927 27,373
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (3,468) (3,392)
Held-to-Maturity Market Value 23,459 23,981
Total 441,285 394,129
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 598 1,212
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (16,239) (13,741)
Investment securities available-for-sale 425,644 381,600
Collateralized Mortgage Backed Securities [Member]    
Investment Holdings [Line Items]    
Total 5,846 6,088
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (513) (499)
Held-to-Maturity Market Value 5,333 5,589
Total 1,096,428 741,819
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 1,762 3,765
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (41,555) (36,347)
Investment securities available-for-sale 1,056,635 709,237
Obligations of state and other political subdivisions    
Investment Holdings [Line Items]    
Total 8,358 8,334
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 50 60
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (204) (179)
Held-to-Maturity Market Value 8,204 8,215
Total 728,838 706,668
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 743 931
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (94,675) (89,509)
Investment securities available-for-sale 634,906 618,090
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 669,079 568,366
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 1,148 1,817
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (15,486) (13,639)
Investment securities available-for-sale 654,741 556,544
Other securities    
Investment Holdings [Line Items]    
Total 8,500 16,750
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (123) (201)
Held-to-Maturity Market Value 8,377 16,549
Total 162,336 163,078
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 776 1,063
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (2,905) (7,189)
Investment securities available-for-sale $ 160,207 $ 156,952