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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Held-to-Maturity Amortized Cost
Amortized Cost	$ 443,957	$ 654,008
Held-to-Maturity Market Value
Held-to-maturity Securities, Fair Value	435,785	653,101
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	2,677,257	1,348,227
Available-for-Sale Market Value
Investment securities available-for-sale	2,654,909	1,349,408
One Year or Less [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	0
Held-to-Maturity Market Value
Held-to-maturity Securities, Fair Value	0
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	4,125
Available-for-Sale Market Value
Investment securities available-for-sale	4,123
After One Year Through Five Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	275
Held-to-Maturity Market Value
Held-to-maturity Securities, Fair Value	279
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	70,801
Available-for-Sale Market Value
Investment securities available-for-sale	70,802
After Five Years Through Ten Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	15,799
Held-to-Maturity Market Value
Held-to-maturity Securities, Fair Value	15,778
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	140,577
Available-for-Sale Market Value
Investment securities available-for-sale	142,222
After Ten Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	229,138
Held-to-Maturity Market Value
Held-to-maturity Securities, Fair Value	228,663
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	159,841
Available-for-Sale Market Value
Investment securities available-for-sale	159,463
Residential Mortgage Backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	31,857	162,093
Held-to-Maturity Market Value
Held-to-maturity Securities, Fair Value	30,342	162,600
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	644,358	290,793
Available-for-Sale Market Value
Investment securities available-for-sale	635,520	289,043
Commercial Mortgage Backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	152,906	255,027
Held-to-Maturity Market Value
Held-to-maturity Securities, Fair Value	147,416	253,399
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	290,930	150,356
Available-for-Sale Market Value
Investment securities available-for-sale	285,977	149,103
Collateralized Mortgage Backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	13,982	143,545
Held-to-Maturity Market Value
Held-to-maturity Securities, Fair Value	13,307	142,297
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	873,923	306,095
Available-for-Sale Market Value
Investment securities available-for-sale	864,575	305,392
Asset-backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	0	0
Held-to-Maturity Market Value
Held-to-maturity Securities, Fair Value	0	0
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	492,702	377,655
Available-for-Sale Market Value
Investment securities available-for-sale	$ 492,227	$ 378,977

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- Definition

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

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