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INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Investment Holdings [Line Items]    
Total $ 79,542 $ 80,321
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 71 130
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (8,763) (8,763)
Held-to-Maturity Market Value 70,850 71,688
Total 3,221,380 3,382,604
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 2,134 3,842
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (372,847) (365,320)
Investment securities available-for-sale 2,850,667 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 34,910 34,904
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 0 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (3,998) (3,661)
Investment securities available-for-sale 30,912 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 82,145 81,790
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 0 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (12,761) (12,010)
Investment securities available-for-sale 69,384 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 839,802 744,546
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 763 2,034
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (98,339) (85,532)
Investment securities available-for-sale 742,226 661,048
Commercial Mortgage Backed Securities [Member]    
Investment Holdings [Line Items]    
Total 32,286 32,926
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (4,739) (4,628)
Held-to-Maturity Market Value 27,547 28,298
Total 428,261 543,134
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 0 7
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (35,560) (35,911)
Investment securities available-for-sale 392,701 507,230
Collateralized Mortgage Backed Securities [Member]    
Investment Holdings [Line Items]    
Total 7,797 7,970
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (662) (539)
Held-to-Maturity Market Value 7,135 7,431
Total 429,785 478,744
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 88 181
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (58,111) (60,277)
Investment securities available-for-sale 371,762 418,648
Obligations of state and other political subdivisions    
Investment Holdings [Line Items]    
Total 8,209 8,175
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 71 130
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (270) (215)
Held-to-Maturity Market Value 8,010 8,090
Total 711,149 765,223
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 1,274 1,614
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (119,217) (114,320)
Investment securities available-for-sale 593,206 652,517
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 561,117 600,055
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 9 6
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (32,470) (39,813)
Investment securities available-for-sale 528,656 560,248
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 (3,092) (3,381)
Held-to-Maturity Market Value 28,158 27,869
Total 134,211 134,208
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments 0 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments (12,391) (13,796)
Investment securities available-for-sale $ 121,820 $ 120,412