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SECURITIES (Narrative) (Detail) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) security | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) security | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) security
Schedule of Investments [Line Items] |  |  |  |  |
Net unrealized gains (losses) on available-for-sale securities, net of tax | $ (5,165,000) |  | $ (5,165,000) |  | $ (6,085,000)
Deferred tax assets, unrealized losses on available for sale securities | $ 2,700,000 |  | 2,700,000 |  | $ 3,300,000
Payments to acquire investments |  |  | $ 141,600,000 | $ 140,700,000 |
AFS securities in unrealized loss positions, number of positions | security | 177 |  | 177 |  | 209
AFS and HTM securities in Continuous Unrealized Loss Position | $ 633,700,000 |  | $ 633,700,000 |  | $ 658,500,000
AFS and HTM Securities Unrealized Loss Accumulated in Investments | 9,700,000 |  | 9,700,000 |  | 13,200,000
Fair Value - 12 Months of More | $ 135,730,000 |  | $ 135,730,000 |  | $ 103,708,000
Unrealized Loss as a Percent of Fair Value | 1.50% |  | 1.50% |  | 2.00%
Proceeds from Sale of Available-for-sale Securities | $ 20,269,000 | $ 0 | $ 20,269,000 | 84,000 |
Net gain on sale of securities | 827,000 | $ 0 | 827,000 | 4,000 |
Investment securities sold, carrying amount | 19,400,000 |  | 19,400,000 | 80,000 |
Federal Home Loan Bank Stock | 19,200,000 |  | 19,200,000 |  | $ 17,800,000
Federal Reserve Bank Stock | 5,400,000 |  | 5,400,000 |  | 5,400,000
Security pledged as collateral, amortized cost | 714,000,000 |  | 714,000,000 |  | 597,300,000
Security pledged as collateral, fair value | 707,200,000 |  | 707,200,000 |  | 589,700,000
Residential Mortgage Backed Securities [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Fair Value - 12 Months of More | 135,700,000 |  | 135,700,000 |  |
Collateralized Mortgage Backed Securities [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Fair Value - 12 Months of More | 103,700,000 |  | 103,700,000 |  |
Mortgage Backed Securities and Collateralized Mortgage Obligations [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
AFS and HTM Securities Unrealized Loss Accumulated in Investments | 4,800,000 |  | 4,800,000 |  | 3,900,000
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Fair Value - 12 Months of More | 47,553,000 |  | 47,553,000 |  | 29,496,000
Collateralized Mortgage Obligations [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Fair Value - 12 Months of More | $ 88,177,000 |  | $ 88,177,000 |  | $ 74,212,000
Available-for-sale Securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Payments to acquire investments |  |  |  | 130,300,000 |
Held-to-maturity Securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Payments to acquire investments |  |  |  | $ 10,400,000 |

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