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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Held-to-Maturity Amortized Cost
Amortized Cost	$ 77,985	$ 80,321
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	71,126	71,688
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	3,418,334	3,382,604
Available-for-Sale Market Value
Investment securities available-for-sale	3,157,265	3,021,126
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	6,860
Available-for-Sale Market Value
Investment securities available-for-sale	6,878
After One Year Through Five Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	5,137
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	5,233
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	110,769
Available-for-Sale Market Value
Investment securities available-for-sale	103,568
After Five Years Through Ten Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	32,760
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	30,353
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	238,451
Available-for-Sale Market Value
Investment securities available-for-sale	209,263
After Ten Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	1,615
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	1,384
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	504,684
Available-for-Sale Market Value
Investment securities available-for-sale	426,993
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	978,973	744,546
Available-for-Sale Market Value
Investment securities available-for-sale	913,941	661,048
Commercial Mortgage Backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	31,242	32,926
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	27,464	28,298
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	415,811	543,134
Available-for-Sale Market Value
Investment securities available-for-sale	392,569	507,230
Collateralized Mortgage Backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	7,231	7,970
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	6,692	7,431
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	605,547	478,744
Available-for-Sale Market Value
Investment securities available-for-sale	564,334	418,648
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	557,239	600,055
Available-for-Sale Market Value
Investment securities available-for-sale	$ 539,719	$ 560,248

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