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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Held-to-Maturity Amortized Cost
Amortized Cost	$ 78,921	$ 80,321
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	70,066	71,688
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	3,410,038	3,382,604
Available-for-Sale Market Value
Investment securities available-for-sale	3,036,758	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	10,536
Available-for-Sale Market Value
Investment securities available-for-sale	10,542
After One Year Through Five Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	5,092
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	5,070
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	159,963
Available-for-Sale Market Value
Investment securities available-for-sale	146,287
After Five Years Through Ten Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	32,747
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	29,909
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	250,521
Available-for-Sale Market Value
Investment securities available-for-sale	211,774
After Ten Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	1,655
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	1,424
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	532,565
Available-for-Sale Market Value
Investment securities available-for-sale	434,193
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	909,468	744,546
Available-for-Sale Market Value
Investment securities available-for-sale	807,123	661,048
Commercial Mortgage Backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	31,961	32,926
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	27,070	28,298
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	438,738	543,134
Available-for-Sale Market Value
Investment securities available-for-sale	405,273	507,230
Collateralized Mortgage Backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	7,466	7,970
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	6,593	7,431
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	529,316	478,744
Available-for-Sale Market Value
Investment securities available-for-sale	472,465	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	578,931	600,055
Available-for-Sale Market Value
Investment securities available-for-sale	$ 549,101	$ 560,248

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