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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Held-to-Maturity Amortized Cost
Amortized Cost	$ 669,816	$ 763,254
Held-to-Maturity Market Value
Held-to-maturity Securities, Fair Value	672,236	763,575
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	1,281,320	1,045,337
Available-for-Sale Market Value
Investment securities available-for-sale	1,286,770	1,039,870
One Year or Less [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	170
Held-to-Maturity Market Value
Held-to-maturity Securities, Fair Value	170
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	2,408
Available-for-Sale Market Value
Investment securities available-for-sale	2,408
After One Year Through Five Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	4,466
Held-to-Maturity Market Value
Held-to-maturity Securities, Fair Value	4,469
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	26,795
Available-for-Sale Market Value
Investment securities available-for-sale	27,154
After Five Years Through Ten Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	2,690
Held-to-Maturity Market Value
Held-to-maturity Securities, Fair Value	2,849
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	78,265
Available-for-Sale Market Value
Investment securities available-for-sale	79,868
After Ten Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	79,626
Held-to-Maturity Market Value
Held-to-maturity Securities, Fair Value	80,416
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	114,290
Available-for-Sale Market Value
Investment securities available-for-sale	116,042
Residential Mortgage Backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	171,468	205,522
Held-to-Maturity Market Value
Held-to-maturity Securities, Fair Value	172,315	206,096
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	272,254	184,960
Available-for-Sale Market Value
Investment securities available-for-sale	272,116	183,395
Commercial Mortgage Backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	257,590	278,728
Held-to-Maturity Market Value
Held-to-maturity Securities, Fair Value	258,192	280,165
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	142,152	154,239
Available-for-Sale Market Value
Investment securities available-for-sale	142,198	153,601
Collateralized Mortgage Backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	153,806	195,408
Held-to-Maturity Market Value
Held-to-maturity Securities, Fair Value	153,825	195,057
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	304,679	232,701
Available-for-Sale Market Value
Investment securities available-for-sale	305,103	231,014
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	340,477	322,708
Available-for-Sale Market Value
Investment securities available-for-sale	$ 341,881	$ 321,212

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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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