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SECURITIES AVAILABLE FOR SALE - Summary of Amortized Cost and Fair Value and Corresponding Amounts of Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Amortized Cost |  |
Total debt securities | $ 401,869 |
Equity securities | 50 |
Totals | 401,919 | $ 392,279
Gross Unrealized Gains |  |
Totals | 3,138 | 3,885
Gross Unrealized Losses |  |
Totals | 4,903 | 2,040
Fair Value |  |
Total debt securities | 400,063 |
Equity securities | 91 |
Totals | 400,154 | 394,124
Debt securities |  |
Amortized Cost |  |
Total debt securities | 401,869 | 392,229
Gross Unrealized Gains |  |
Total debt securities | 3,097 | 3,862
Gross Unrealized Losses |  |
Total debt securities | 4,903 | 2,040
Fair Value |  |
Total debt securities | 400,063 | 394,051
Debt securities | U.S. Government Agencies |  |
Amortized Cost |  |
Total debt securities | 39,569 | 47,209
Gross Unrealized Gains |  |
Total debt securities | 147 | 200
Gross Unrealized Losses |  |
Total debt securities | 124 | 182
Fair Value |  |
Total debt securities | 39,592 | 47,227
Debt securities | States and political subdivisions |  |
Amortized Cost |  |
Total debt securities | 163,677 | 124,421
Gross Unrealized Gains |  |
Total debt securities | 1,782 | 2,483
Gross Unrealized Losses |  |
Total debt securities | 1,177 | 943
Fair Value |  |
Total debt securities | 164,282 | 125,961
Debt securities | U.S. Government Sponsored Enterprises (GSE) residential mortgage-backed securities |  |
Amortized Cost |  |
Total debt securities | 116,022 | 132,389
Gross Unrealized Gains |  |
Total debt securities | 928 | 229
Gross Unrealized Losses |  |
Total debt securities | 6 | 269
Fair Value |  |
Total debt securities | 116,944 | 132,349
Debt securities | GSE residential collateralized mortgage obligations (CMOs) |  |
Amortized Cost |  |
Total debt securities | 72,411 | 15,668
Gross Unrealized Gains |  |
Total debt securities | 240 | 215
Gross Unrealized Losses |  |
Total debt securities | 3,268 | 40
Fair Value |  |
Total debt securities | 69,383 | 15,843
Debt securities | GSE commercial CMOs |  |
Amortized Cost |  |
Total debt securities | 5,148 | 63,598
Gross Unrealized Gains |  |
Total debt securities | 0 | 735
Gross Unrealized Losses |  |
Total debt securities | 292 | 563
Fair Value |  |
Total debt securities | 4,856 | 63,770
Debt securities | Private label CMOs |  |
Amortized Cost |  |
Total debt securities | 5,042 | 8,944
Gross Unrealized Gains |  |
Total debt securities | 0 | 0
Gross Unrealized Losses |  |
Total debt securities | 36 | 43
Fair Value |  |
Total debt securities | 5,006 | 8,901
Equity securities |  |
Amortized Cost |  |
Equity securities | 50 | 50
Gross Unrealized Gains |  |
Equity securities | 41 | 23
Gross Unrealized Losses |  |
Equity securities | 0 | 0
Fair Value |  |
Equity securities | $ 91 | $ 73

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