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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Held-to-Maturity Amortized Cost
Amortized Cost	$ 121,945	$ 131,687
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	124,294	136,698
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	3,698,779	3,330,029
Available-for-Sale Market Value
Investment securities available-for-sale	3,753,763
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	14,781
Available-for-Sale Market Value
Investment securities available-for-sale	14,963
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	56,598
Available-for-Sale Market Value
Investment securities available-for-sale	58,309
After Five Years Through Ten Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	37,135
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	37,662
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	184,348
Available-for-Sale Market Value
Investment securities available-for-sale	192,197
After Ten Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	3,749
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	3,839
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	803,858
Available-for-Sale Market Value
Investment securities available-for-sale	826,174
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	784,407
Available-for-Sale Market Value
Investment securities available-for-sale	785,640
Commercial Mortgage Backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	63,481	71,737
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	65,515	75,222
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	591,629
Available-for-Sale Market Value
Investment securities available-for-sale	595,045
Collateralized Mortgage Backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	17,580	5,799
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	17,278	5,878
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	661,322
Available-for-Sale Market Value
Investment securities available-for-sale	676,714
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	601,836
Available-for-Sale Market Value
Investment securities available-for-sale	$ 604,721

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount 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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