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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Held-to-Maturity Amortized Cost
Amortized Cost	$ 76,469	$ 76,960
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	69,358	68,989
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	3,546,421	3,512,652
Available-for-Sale Market Value
Investment securities available-for-sale	3,260,981	3,183,776
One Year or Less [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	0
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	0
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	4,340
Available-for-Sale Market Value
Investment securities available-for-sale	3,305
After One Year Through Five Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	5,716
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	5,720
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	142,509
Available-for-Sale Market Value
Investment securities available-for-sale	128,958
After Five Years Through Ten Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	32,298
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	30,115
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	199,185
Available-for-Sale Market Value
Investment securities available-for-sale	169,149
After Ten Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	1,518
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	1,250
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	480,680
Available-for-Sale Market Value
Investment securities available-for-sale	397,931
Residential Mortgage Backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	0	0
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	0	0
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	1,189,267	1,102,242
Available-for-Sale Market Value
Investment securities available-for-sale	1,107,735	998,542
Commercial Mortgage Backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	30,101	30,444
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	26,084	25,990
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	332,286	382,727
Available-for-Sale Market Value
Investment securities available-for-sale	311,364	357,372
Collateralized Mortgage Backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	6,836	7,007
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	6,189	6,219
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	675,620	620,315
Available-for-Sale Market Value
Investment securities available-for-sale	634,064	569,165
Asset-backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	0	0
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	0	0
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	522,534	555,484
Available-for-Sale Market Value
Investment securities available-for-sale	$ 508,475	$ 534,103

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