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INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Investment Holdings [Line Items] |  |
Total | $ 633,722 | $ 654,008
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 2,368 | 5,572
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (12,123) | (6,479)
Held-to-Maturity Market Value | 623,967 | 653,101
Total | 1,370,844 | 1,348,227
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 5,909 | 8,328
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (17,372) | (7,147)
Investment securities available-for-sale | 1,359,381 | 1,349,408
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 | (2) | (1)
Investment securities available-for-sale | 96 | 97
Securities of U.S. government agencies and corporations |  |
Investment Holdings [Line Items] |  |
Total | 10,627 | 11,168
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 0 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (188) | (76)
Held-to-Maturity Market Value | 10,439 | 11,092
Total | 25,689 | 15,695
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 244 | 220
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (193) | 0
Investment securities available-for-sale | 25,740 | 15,915
Residential Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 155,208 | 162,093
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 1,225 | 2,042
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (2,817) | (1,535)
Held-to-Maturity Market Value | 153,616 | 162,600
Total | 288,757 | 290,793
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 375 | 849
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (6,689) | (2,599)
Investment securities available-for-sale | 282,443 | 289,043
Commercial Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 251,253 | 255,027
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 228 | 1,372
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (5,348) | (3,000)
Held-to-Maturity Market Value | 246,133 | 253,399
Total | 153,770 | 150,356
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 47 | 164
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (2,875) | (1,417)
Investment securities available-for-sale | 150,942 | 149,103
Collateralized Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 135,143 | 143,545
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 86 | 354
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (2,798) | (1,602)
Held-to-Maturity Market Value | 132,431 | 142,297
Total | 305,496 | 306,095
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 558 | 1,158
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (4,791) | (1,861)
Investment securities available-for-sale | 301,263 | 305,392
Obligations of state and other political subdivisions |  |
Investment Holdings [Line Items] |  |
Total | 81,491 | 82,175
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 829 | 1,804
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (972) | (266)
Held-to-Maturity Market Value | 81,348 | 83,713
Total | 121,813 | 124,269
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 1,307 | 2,162
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (1,696) | (676)
Investment securities available-for-sale | 121,424 | 125,755
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 | 391,943 | 377,655
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 1,351 | 1,628
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (782) | (306)
Investment securities available-for-sale | 392,512 | 378,977
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 | 83,278 | 83,266
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 2,027 | 2,147
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (344) | (287)
Investment securities available-for-sale | $ 84,961 | $ 85,126

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