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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Held-to-Maturity Amortized Cost
Amortized Cost	$ 103,886	$ 131,687
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	105,679	136,698
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	4,065,301	3,330,029
Available-for-Sale Market Value
Investment securities available-for-sale, at fair value (amortized cost $4,065,301 at September 30, 2021 and $3,330,029 at December 31, 2020)	4,114,094	3,424,580
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	26,751
Available-for-Sale Market Value
Investment securities available-for-sale, at fair value (amortized cost $4,065,301 at September 30, 2021 and $3,330,029 at December 31, 2020)	26,938
After One Year Through Five Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	635
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	696
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	53,516
Available-for-Sale Market Value
Investment securities available-for-sale, at fair value (amortized cost $4,065,301 at September 30, 2021 and $3,330,029 at December 31, 2020)	55,332
After Five Years Through Ten Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	36,603
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	37,162
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	333,192
Available-for-Sale Market Value
Investment securities available-for-sale, at fair value (amortized cost $4,065,301 at September 30, 2021 and $3,330,029 at December 31, 2020)	343,266
After Ten Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	3,162
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	3,206
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	841,610
Available-for-Sale Market Value
Investment securities available-for-sale, at fair value (amortized cost $4,065,301 at September 30, 2021 and $3,330,029 at December 31, 2020)	859,531
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
Debt Securities, Available-for-sale, Amortized Cost	711,442	704,482
Available-for-Sale Market Value
Investment securities available-for-sale, at fair value (amortized cost $4,065,301 at September 30, 2021 and $3,330,029 at December 31, 2020)	713,885	720,183
Commercial Mortgage Backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	50,456	71,737
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	51,793	75,222
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	702,387	584,125
Available-for-Sale Market Value
Investment securities available-for-sale, at fair value (amortized cost $4,065,301 at September 30, 2021 and $3,330,029 at December 31, 2020)	707,913	590,936
Collateralized Mortgage Backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	13,030	5,799
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	12,822	5,878
Available-for-Sale Amortized Cost
Debt Securities, Available-for-sale, Amortized Cost	730,190	634,418
Available-for-Sale Market Value
Investment securities available-for-sale, at fair value (amortized cost $4,065,301 at September 30, 2021 and $3,330,029 at December 31, 2020)	738,323	655,121
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	666,213	478,539
Available-for-Sale Market Value
Investment securities available-for-sale, at fair value (amortized cost $4,065,301 at September 30, 2021 and $3,330,029 at December 31, 2020)	$ 668,906	$ 481,871

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