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INVESTMENTS (Narrative) (Detail) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) security | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) security | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) security
Schedule of Investments [Line Items] |  |  |  |  |
Net unrealized gains (losses) on available-for-sale securities, net of tax | $ (26,221,000) |  | $ (26,221,000) |  | $ (10,300,000)
Deferred tax assets, unrealized losses on available for sale securities | $ 7,200,000 |  | 7,200,000 |  | $ 2,800,000
Payments to acquire investments |  |  | $ 148,800,000 | $ 141,600,000 |
AFS securities in unrealized loss positions, number of positions | security | 354 |  | 354 |  | 209
AFS and HTM securities in Continuous Unrealized Loss Position | $ 840,200,000 |  | $ 840,200,000 |  | $ 741,200,000
AFS and HTM Securities Unrealized Loss Accumulated in Investments | 36,300,000 |  | 36,300,000 |  | 14,500,000
Fair Value - 12 Months of More | $ 509,704,000 |  | $ 509,704,000 |  | $ 398,360,000
Unrealized Loss as a Percent of Fair Value | 4.30% |  | 4.30% |  | 2.00%
Investment securities sold, carrying amount | $ 23,100,000 | $ 19,400,000 | $ 33,000,000 | 19,400,000 |
Gain (Loss) on Sale of Investments |  |  | 695,000 | 827,000 |
Net gain on sale of securities | 664,000 | $ 827,000 | 695,000 | $ 827,000 |
Security pledged as collateral, amortized cost | 696,600,000 |  | 696,600,000 |  | $ 702,500,000
Security pledged as collateral, fair value | 666,200,000 |  | 666,200,000 |  | 691,200,000
Unrealized loss, change in fair value of bank stock equity securities | 11,000 |  | (13,000) |  |
Gain on sale of other investment |  |  | 195,000 |  |
Mortgage Backed Securities and Collateralized Mortgage Obligations |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
AFS and HTM Securities Unrealized Loss Accumulated in Investments | 29,100,000 |  | 29,100,000 |  | 11,200,000
Fair Value - 12 Months of More | 509,700,000 |  | 509,700,000 |  | 398,400,000
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Fair Value - 12 Months of More | 328,180,000 |  | 328,180,000 |  | 233,971,000
Collateralized Mortgage Obligations |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Fair Value - 12 Months of More | 181,524,000 |  | 181,524,000 |  | $ 164,389,000
Debt Securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Net gain on sale of securities | (275,000) |  | (244,000) |  |
Visa Inc. Class B Common Stock |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investment securities sold, carrying amount | 441,000 |  | 441,000 |  |
Gain on sale of other investment | $ 939,000 |  | $ 939,000 |  |

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