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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, 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 | $ 136,694 | $ 77,404
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses | 1,630 | 325
Total temporarily impaired securities, 12 Months or More, Fair Value | 19,011 | 74,814
Total temporarily impaired securities, 12 Months or More, Unrealized Losses | 824 | 1,605
Total temporarily impaired securities, Total, Fair Value | 155,705 | 152,218
Total temporarily impaired securities, Total, Unrealized Losses | 2,454 | 1,930
U.S. Government Agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, Less Than 12 Months, Fair Value | 23,313 | 0
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses | 177 | 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 | 23,313 | 9,012
Total temporarily impaired securities, Total, Unrealized Losses | 177 | 23
States and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, Less Than 12 Months, Fair Value | 68,777 | 0
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses | 1,011 | 0
Total temporarily impaired securities, 12 Months or More, Fair Value | 13,994 | 35,833
Total temporarily impaired securities, 12 Months or More, Unrealized Losses | 774 | 996
Total temporarily impaired securities, Total, Fair Value | 82,771 | 35,833
Total temporarily impaired securities, Total, Unrealized Losses | 1,785 | 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 | 8,259 | 65,474
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses | 22 | 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 | 8,259 | 65,474
Total temporarily impaired securities, Total, Unrealized Losses | 22 | 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 | 1,807 | 11,930
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses | 25 | 128
Total temporarily impaired securities, 12 Months or More, Fair Value | 5,017 | 0
Total temporarily impaired securities, 12 Months or More, Unrealized Losses | 50 | 0
Total temporarily impaired securities, Total, Fair Value | 6,824 | 11,930
Total temporarily impaired securities, Total, Unrealized Losses | 75 | 128
GSE commercial CMOs |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, Less Than 12 Months, Fair Value | 34,538 | 0
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses | 395 | 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 | 34,538 | 29,969
Total temporarily impaired securities, Total, Unrealized Losses | $ 395 | $ 586

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