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INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Investment Holdings [Line Items]    
Total $ 76,469 $ 76,960
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 29 42
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (7,140) (8,013)
Held-to-Maturity Market Value 69,358 68,989
Total 3,546,421 3,512,652
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 9,007 3,458
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (294,447) (332,334)
Investment securities available-for-sale 3,260,981 3,183,776
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 99 99
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 0 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (7) (9)
Investment securities available-for-sale 92 90
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 72,573 83,224
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 0 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (8,212) (11,546)
Investment securities available-for-sale 64,361 71,678
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 1,189,267 1,102,242
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 3,478 508
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (85,010) (104,208)
Investment securities available-for-sale 1,107,735 998,542
Commercial Mortgage Backed Securities [Member]    
Investment Holdings [Line Items]    
Total 30,101 30,444
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (4,017) (4,454)
Held-to-Maturity Market Value 26,084 25,990
Total 332,286 382,727
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 424 26
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (21,346) (25,381)
Investment securities available-for-sale 311,364 357,372
Collateralized Mortgage Backed Securities [Member]    
Investment Holdings [Line Items]    
Total 6,836 7,007
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (647) (788)
Held-to-Maturity Market Value 6,189 6,219
Total 675,620 620,315
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 3,212 1,449
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (44,768) (52,599)
Investment securities available-for-sale 634,064 569,165
Obligations of state and other political subdivisions    
Investment Holdings [Line Items]    
Total 8,282 8,259
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 29 42
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (325) (339)
Held-to-Maturity Market Value 7,986 7,962
Total 616,286 630,813
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 530 357
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (112,655) (109,904)
Investment securities available-for-sale 504,161 521,266
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 522,534 555,484
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 1,050 998
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (15,109) (22,379)
Investment securities available-for-sale 508,475 534,103
Other securities    
Investment Holdings [Line Items]    
Total 31,250 31,250
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (2,151) (2,432)
Held-to-Maturity Market Value 29,099 28,818
Total 137,756 137,748
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 313 120
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (7,340) (6,308)
Investment securities available-for-sale $ 130,729 $ 131,560