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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, 2017 | Dec. 31, 2016
--- | --- | ---
Amortized Cost |  |
Total debt securities | $ 411,656 |
Equity securities | 50 |
Totals | 411,706 | $ 401,919
Gross Unrealized Gains |  |
Totals | 7,496 | 3,138
Gross Unrealized Losses |  |
Totals | 3,894 | 4,903
Fair Value |  |
Total debt securities | 415,194 |
Equity securities | 114 |
Totals | 415,308 | 400,154
Debt securities |  |
Amortized Cost |  |
Total debt securities | 411,656 | 401,869
Gross Unrealized Gains |  |
Total debt securities | 7,432 | 3,097
Gross Unrealized Losses |  |
Total debt securities | 3,894 | 4,903
Fair Value |  |
Total debt securities | 415,194 | 400,063
Debt securities | U.S. Government Agencies |  |
Amortized Cost |  |
Total debt securities |  | 39,569
Gross Unrealized Gains |  |
Total debt securities |  | 147
Gross Unrealized Losses |  |
Total debt securities |  | 124
Fair Value |  |
Total debt securities |  | 39,592
Debt securities | States and political subdivisions |  |
Amortized Cost |  |
Total debt securities | 153,803 | 163,677
Gross Unrealized Gains |  |
Total debt securities | 6,133 | 1,782
Gross Unrealized Losses |  |
Total debt securities | 478 | 1,177
Fair Value |  |
Total debt securities | 159,458 | 164,282
Debt securities | GSE residential MBSs |  |
Amortized Cost |  |
Total debt securities | 48,600 | 116,022
Gross Unrealized Gains |  |
Total debt securities | 930 | 928
Gross Unrealized Losses |  |
Total debt securities | 0 | 6
Fair Value |  |
Total debt securities | 49,530 | 116,944
Debt securities | GSE residential CMOs |  |
Amortized Cost |  |
Total debt securities | 113,658 | 72,411
Gross Unrealized Gains |  |
Total debt securities | 296 | 240
Gross Unrealized Losses |  |
Total debt securities | 2,835 | 3,268
Fair Value |  |
Total debt securities | 111,119 | 69,383
Debt securities | GSE commercial CMOs |  |
Amortized Cost |  |
Total debt securities |  | 5,148
Gross Unrealized Gains |  |
Total debt securities |  | 0
Gross Unrealized Losses |  |
Total debt securities |  | 292
Fair Value |  |
Total debt securities |  | 4,856
Debt securities | Private label residential CMOs |  |
Amortized Cost |  |
Total debt securities | 999 | 5,042
Gross Unrealized Gains |  |
Total debt securities | 4 | 0
Gross Unrealized Losses |  |
Total debt securities | 0 | 36
Fair Value |  |
Total debt securities | 1,003 | 5,006
Debt securities | Private label commercial CMOs |  |
Amortized Cost |  |
Total debt securities | 7,809 |
Gross Unrealized Gains |  |
Total debt securities | 0 |
Gross Unrealized Losses |  |
Total debt securities | 156 |
Fair Value |  |
Total debt securities | 7,653 |
Debt securities | Asset-backed |  |
Amortized Cost |  |
Total debt securities | 86,787 |
Gross Unrealized Gains |  |
Total debt securities | 69 |
Gross Unrealized Losses |  |
Total debt securities | 425 |
Fair Value |  |
Total debt securities | 86,431 |
Equity securities |  |
Amortized Cost |  |
Equity securities | 50 | 50
Gross Unrealized Gains |  |
Equity securities | 64 | 41
Gross Unrealized Losses |  |
Equity securities | 0 | 0
Fair Value |  |
Equity securities | $ 114 | $ 91

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