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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 | Dec. 31, 2015 | Dec. 31, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, Less Than 12 Months, Fair Value | $ 183,310 | $ 77,404
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses | 1,430 | 325
Total temporarily impaired securities, 12 Months or More, Fair Value | 18,376 | 74,814
Total temporarily impaired securities, 12 Months or More, Unrealized Losses | 610 | 1,605
Total temporarily impaired securities, Total, Fair Value | 201,686 | 152,218
Total temporarily impaired securities, Total, Unrealized Losses | 2,040 | 1,930
U.S. Government Agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, Less Than 12 Months, Fair Value | 27,640 | 0
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses | 182 | 0
Total temporarily impaired securities, 12 Months or More, Fair Value | 0 | 9,012
Total temporarily impaired securities, 12 Months or More, Unrealized Losses | 0 | 23
Total temporarily impaired securities, Total, Fair Value | 27,640 | 9,012
Total temporarily impaired securities, Total, Unrealized Losses | 182 | 23
States and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, Less Than 12 Months, Fair Value | 30,252 | 0
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses | 373 | 0
Total temporarily impaired securities, 12 Months or More, Fair Value | 14,139 | 35,833
Total temporarily impaired securities, 12 Months or More, Unrealized Losses | 570 | 996
Total temporarily impaired securities, Total, Fair Value | 44,391 | 35,833
Total temporarily impaired securities, Total, Unrealized Losses | 943 | 996
U.S. Government Sponsored Enterprises (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 | 65,474
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses | 269 | 197
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 | 82,911 | 65,474
Total temporarily impaired securities, Total, Unrealized Losses | 269 | 197
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 | 11,930
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses | 0 | 128
Total temporarily impaired securities, 12 Months or More, Fair Value | 4,237 | 0
Total temporarily impaired securities, 12 Months or More, Unrealized Losses | 40 | 0
Total temporarily impaired securities, Total, Fair Value | 4,237 | 11,930
Total temporarily impaired securities, Total, Unrealized Losses | 40 | 128
GSE commercial CMOs |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, Less Than 12 Months, Fair Value | 33,606 | 0
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses | 563 | 0
Total temporarily impaired securities, 12 Months or More, Fair Value | 0 | 29,969
Total temporarily impaired securities, 12 Months or More, Unrealized Losses | 0 | 586
Total temporarily impaired securities, Total, Fair Value | 33,606 | 29,969
Total temporarily impaired securities, Total, Unrealized Losses | 563 | $ 586
Private label CMOs |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, Less Than 12 Months, Fair Value | 8,901 |
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses | 43 |
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 | 8,901 |
Total temporarily impaired securities, Total, Unrealized Losses | $ 43 |

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