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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Held-to-Maturity Amortized Cost
Amortized Cost	$ 83,070	$ 84,021
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	75,762	76,485
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	3,763,658	3,827,418
Available-for-Sale Market Value
Investment securities available-for-sale	3,384,949	3,409,648
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	8,119
Available-for-Sale Market Value
Investment securities available-for-sale	7,981
After One Year Through Five Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	2,607
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	2,720
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	99,178
Available-for-Sale Market Value
Investment securities available-for-sale	93,713
After Five Years Through Ten Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	34,951
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	32,381
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	293,272
Available-for-Sale Market Value
Investment securities available-for-sale	258,231
After Ten Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	1,823
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	1,637
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	688,456
Available-for-Sale Market Value
Investment securities available-for-sale	590,697
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	734,761	747,478
Available-for-Sale Market Value
Investment securities available-for-sale	649,243	650,063
Commercial Mortgage Backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	34,659	35,363
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	30,678	31,249
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	669,015	676,934
Available-for-Sale Market Value
Investment securities available-for-sale	624,894	629,562
Collateralized Mortgage Backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	9,030	9,280
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	8,346	8,453
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	524,394	538,970
Available-for-Sale Market Value
Investment securities available-for-sale	465,115	477,712
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	746,463	772,261
Available-for-Sale Market Value
Investment securities available-for-sale	$ 695,075	$ 711,325

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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