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INVESTMENTS (Narrative) (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) security | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) security | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) security
Schedule of Investments [Line Items] |  |  |  |  |
Net unrealized gains (losses) on available-for-sale securities, net of tax | $ (23,197) |  | $ (23,197) |  | $ (10,300)
Deferred tax assets, unrealized losses on available for sale securities | $ 6,400 |  | 6,400 |  | $ 2,800
Payments to acquire investments |  |  | $ 100,600 | $ 97,300 |
AFS securities in unrealized loss positions, number of positions | security | 337 |  | 337 |  | 209
AFS and HTM securities in Continuous Unrealized Loss Position | $ 835,200 |  | $ 835,200 |  | $ 741,200
AFS and HTM Securities Unrealized Loss Accumulated in Investments | 31,700 |  | 31,700 |  | 14,500
Fair Value - 12 Months of More | $ 390,045 |  | $ 390,045 |  | $ 398,360
Unrealized Loss as a Percent of Fair Value | 3.80% |  | 3.80% |  | 2.00%
Investment securities sold, carrying amount | $ 9,900 |  |  |  |
Gross realized gains | 31 | $ 0 | $ 31 | $ 0 |
Security pledged as collateral, amortized cost | 689,600 |  | 689,600 |  | $ 702,500
Security pledged as collateral, fair value | 663,800 |  | 663,800 |  | 691,200
Unrealized loss, change in fair value of bank stock equity securities | 11 |  | (24) |  |
Gain on sale of other investment |  |  | 195 |  |
Residential Mortgage Backed Securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Fair Value - 12 Months of More | 390,000 |  | 390,000 |  |
Collateralized Mortgage Backed Securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Fair Value - 12 Months of More | 398,400 |  | 398,400 |  |
Mortgage Backed Securities and Collateralized Mortgage Obligations |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
AFS and HTM Securities Unrealized Loss Accumulated in Investments | 21,000 |  | 21,000 |  | 11,200
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Fair Value - 12 Months of More | 240,607 |  | 240,607 |  | 233,971
Collateralized Mortgage Obligations |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Fair Value - 12 Months of More | $ 149,438 |  | $ 149,438 |  | $ 164,389

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