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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Held-to-Maturity Amortized Cost
Amortized Cost	$ 112,456	$ 131,687
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	115,171	136,698
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	3,885,363	3,330,029
Available-for-Sale Market Value
Investment securities available-for-sale	3,955,839
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
Available-for-sale Securities, Amortized Cost Basis	26,647
Available-for-Sale Market Value
Investment securities available-for-sale	26,908
After One Year Through Five Years [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
Available-for-sale Securities, Amortized Cost Basis	50,859
Available-for-Sale Market Value
Investment securities available-for-sale	52,674
After Five Years Through Ten Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	37,186
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	37,931
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	298,659
Available-for-Sale Market Value
Investment securities available-for-sale	309,239
After Ten Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	3,452
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	3,517
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	796,786
Available-for-Sale Market Value
Investment securities available-for-sale	826,902
Residential Mortgage Backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	0	13,990
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	0	14,187
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	686,994
Available-for-Sale Market Value
Investment securities available-for-sale	691,363
Commercial Mortgage Backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	56,833	71,737
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	58,661	75,222
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	685,920
Available-for-Sale Market Value
Investment securities available-for-sale	693,737
Collateralized Mortgage Backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	14,985	5,799
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	15,062	5,878
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	740,172
Available-for-Sale Market Value
Investment securities available-for-sale	752,267
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
Available-for-sale Securities, Amortized Cost Basis	599,326
Available-for-Sale Market Value
Investment securities available-for-sale	$ 602,749

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Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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