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INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Investment Holdings [Line Items] |  |
Total | $ 696,269 | $ 763,254
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 7,202 | 6,236
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (4,749) | (5,915)
Held-to-Maturity Market Value | 698,722 | 763,575
Total | 1,295,377 | 1,045,337
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 8,941 | 4,716
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (5,740) | (10,183)
Investment securities available-for-sale | 1,298,578 | 1,039,870
U.S. Treasuries |  |
Investment Holdings [Line Items] |  |
Total | 0 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 0 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 0
Held-to-Maturity Market Value | 0 | 0
Total | 98 | 98
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 0 | 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | 0 | (1)
Investment securities available-for-sale | 98 | 97
Securities of U.S. government agencies and corporations |  |
Investment Holdings [Line Items] |  |
Total | 12,130 | 13,011
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 28 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (17) | (110)
Held-to-Maturity Market Value | 12,141 | 12,901
Total | 16,967 | 7,056
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 159 | 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | 0 | (40)
Investment securities available-for-sale | 17,126 | 7,016
Residential Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 181,553 | 205,522
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 1,996 | 1,740
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (1,338) | (1,166)
Held-to-Maturity Market Value | 182,211 | 206,096
Total | 262,052 | 184,960
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 1,140 | 1,175
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (2,019) | (2,740)
Investment securities available-for-sale | 261,173 | 183,395
Commercial Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 261,739 | 278,728
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 3,156 | 3,254
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (1,912) | (1,817)
Held-to-Maturity Market Value | 262,983 | 280,165
Total | 157,138 | 154,239
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 682 | 188
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (412) | (826)
Investment securities available-for-sale | 157,408 | 153,601
Collateralized Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 165,625 | 195,408
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 1,138 | 1,125
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (1,083) | (1,476)
Held-to-Maturity Market Value | 165,680 | 195,057
Total | 324,712 | 232,701
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 1,289 | 634
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (1,609) | (2,321)
Investment securities available-for-sale | 324,392 | 231,014
Obligations of state and other political subdivisions |  |
Investment Holdings [Line Items] |  |
Total | 75,222 | 70,585
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 884 | 117
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (399) | (1,346)
Held-to-Maturity Market Value | 75,707 | 69,356
Total | 122,511 | 96,934
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 2,206 | 1,461
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (889) | (1,514)
Investment securities available-for-sale | 123,828 | 96,881
Asset-backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 0 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 0 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 0
Held-to-Maturity Market Value | 0 | 0
Total | 327,564 | 322,708
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 1,717 | 517
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (504) | (2,013)
Investment securities available-for-sale | 328,777 | 321,212
Other securities |  |
Investment Holdings [Line Items] |  |
Total | 0 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 0 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 0
Held-to-Maturity Market Value | 0 | 0
Total | 84,335 | 46,641
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 1,748 | 741
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (307) | (728)
Investment securities available-for-sale | $ 85,776 | $ 46,654

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