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INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Investment Holdings [Line Items]    
Total $ 78,921 $ 80,321
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 35 130
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (8,890) (8,763)
Held-to-Maturity Market Value 70,066 71,688
Total 3,410,038 3,382,604
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 2,024 3,842
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (375,304) (365,320)
Investment securities available-for-sale 3,036,758 3,021,126
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 34,915 34,904
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 0 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (3,943) (3,661)
Investment securities available-for-sale 30,972 31,243
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 82,501 81,790
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 0 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (12,521) (12,010)
Investment securities available-for-sale 69,980 69,780
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 909,468 744,546
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 469 2,034
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (102,814) (85,532)
Investment securities available-for-sale 807,123 661,048
Commercial Mortgage Backed Securities [Member]    
Investment Holdings [Line Items]    
Total 31,961 32,926
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (4,891) (4,628)
Held-to-Maturity Market Value 27,070 28,298
Total 438,738 543,134
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 0 7
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (33,465) (35,911)
Investment securities available-for-sale 405,273 507,230
Collateralized Mortgage Backed Securities [Member]    
Investment Holdings [Line Items]    
Total 7,466 7,970
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (873) (539)
Held-to-Maturity Market Value 6,593 7,431
Total 529,316 478,744
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 374 181
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (57,225) (60,277)
Investment securities available-for-sale 472,465 418,648
Obligations of state and other political subdivisions    
Investment Holdings [Line Items]    
Total 8,244 8,175
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 35 130
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (325) (215)
Held-to-Maturity Market Value 7,954 8,090
Total 701,945 765,223
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 975 1,614
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (124,348) (114,320)
Investment securities available-for-sale 578,572 652,517
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 578,931 600,055
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 191 6
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (30,021) (39,813)
Investment securities available-for-sale 549,101 560,248
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 (2,801) (3,381)
Held-to-Maturity Market Value 28,449 27,869
Total 134,224 134,208
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 15 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (10,967) (13,796)
Investment securities available-for-sale $ 123,272 $ 120,412