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SECURITIES AVAILABLE FOR SALE - Gross Unrealized Losses and Fair Value of Company's Available for Sale Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, less than 12 months, fair value | $ 12,537 | $ 183,310
Total temporarily impaired securities, less than 12 months, unrealized losses | 95 | 1,430
Total temporarily impaired securities, 12 months or more, fair value | 21,449 | 18,376
Total temporarily impaired securities, 12 months or more, unrealized losses | 235 | 610
Total temporarily impaired securities, total, fair value | 33,986 | 201,686
Total temporarily impaired securities, total, unrealized losses | 330 | 2,040
U.S. Government Agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, less than 12 months, fair value | 5,261 | 27,640
Total temporarily impaired securities, less than 12 months, unrealized losses | 22 | 182
Total temporarily impaired securities, 12 months or more, fair value | 15,098 | 0
Total temporarily impaired securities, 12 months or more, unrealized losses | 113 | 0
Total temporarily impaired securities, total, fair value | 20,359 | 27,640
Total temporarily impaired securities, total, unrealized losses | 135 | 182
States and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, less than 12 months, fair value | 0 | 30,252
Total temporarily impaired securities, less than 12 months, unrealized losses | 0 | 373
Total temporarily impaired securities, 12 months or more, fair value | 5,553 | 14,139
Total temporarily impaired securities, 12 months or more, unrealized losses | 113 | 570
Total temporarily impaired securities, total, fair value | 5,553 | 44,391
Total temporarily impaired securities, total, unrealized losses | 113 | 943
GSE residential mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, less than 12 months, fair value |  | 82,911
Total temporarily impaired securities, less than 12 months, unrealized losses |  | 269
Total temporarily impaired securities, 12 months or more, fair value |  | 0
Total temporarily impaired securities, 12 months or more, unrealized losses |  | 0
Total temporarily impaired securities, total, fair value |  | 82,911
Total temporarily impaired securities, total, unrealized losses |  | 269
GSE residential collateralized mortgage obligations (CMOs) |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, less than 12 months, fair value | 0 | 0
Total temporarily impaired securities, less than 12 months, unrealized losses | 0 | 0
Total temporarily impaired securities, 12 months or more, fair value | 798 | 4,237
Total temporarily impaired securities, 12 months or more, unrealized losses | 9 | 40
Total temporarily impaired securities, total, fair value | 798 | 4,237
Total temporarily impaired securities, total, unrealized losses | 9 | 40
GSE commercial CMOs |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, less than 12 months, fair value |  | 33,606
Total temporarily impaired securities, less than 12 months, unrealized losses |  | 563
Total temporarily impaired securities, 12 months or more, fair value |  | 0
Total temporarily impaired securities, 12 months or more, unrealized losses |  | 0
Total temporarily impaired securities, total, fair value |  | 33,606
Total temporarily impaired securities, total, unrealized losses |  | 563
Private label CMOs |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, less than 12 months, fair value | 7,276 | 8,901
Total temporarily impaired securities, less than 12 months, unrealized losses | 73 | 43
Total temporarily impaired securities, 12 months or more, fair value | 0 | 0
Total temporarily impaired securities, 12 months or more, unrealized losses | 0 | 0
Total temporarily impaired securities, total, fair value | 7,276 | 8,901
Total temporarily impaired securities, total, unrealized losses | $ 73 | $ 43

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