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SECURITIES AVAILABLE FOR SALE - Additional Information (Detail) $ in Thousands | 2 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 04, 2016 USD ($) | Dec. 31, 2015 USD ($) security | Dec. 31, 2014 USD ($) security | Dec. 31, 2013 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Securities held | security |  | 53 | 37 |
Sales of available for sale securities |  | $ 65,611 | $ 169,573 | $ 74,273
Gross gains on the sales of securities |  | 1,948 | 2,301 | 473
Gross losses on securities available for sale |  | 24 | 366 | $ 141
Fair value of securities pledged to secure public funds and other purposes |  | 250,397 | $ 261,034 |
Debt security |  | 392,229 |  |
Fair value of debt securities |  | $ 394,051 |  |
States and political subdivisions |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Securities held | security |  | 21 |  |
Securities held, less than 12 months category | security |  | 16 |  |
Securities held, 12 months or longer category | security |  | 5 | 16 |
Private label CMOs |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Securities held | security |  | 3 |  |
Debt Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Debt security |  | $ 392,229 | $ 373,725 |
Fair value of debt securities |  | $ 394,051 | $ 376,132 |
Debt Securities | US Government Agencies and US Government Sponsored Enterprises (GSE) |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Securities held | security |  | 29 | 21 |
Securities held, less than 12 months category | security |  | 25 | 13 |
Securities held, 12 months or longer category | security |  | 4 | 8 |
Debt Securities | States and political subdivisions |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Debt security |  | $ 124,421 | $ 52,578 |
Fair value of debt securities |  | $ 125,961 | 52,401 |
Debt Securities | Private label CMOs |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Securities held, less than 12 months category | security |  | 3 |  |
Debt security |  | $ 8,944 |  |
Fair value of debt securities |  | 8,901 |  |
Debt Securities | GSE commercial CMOs |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Debt security |  | 63,598 | 65,041 |
Fair value of debt securities |  | $ 63,770 | $ 65,472 |
Debt Securities | GSE commercial CMOs | Subsequent Event |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Net gain on sale of investments (unaudited) | $ 1,420 |  |  |

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