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SECURITIES AVAILABLE FOR SALE - Amortized Cost and Fair Values of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Amortized Cost |  |
Total debt securities | $ 397,526 |
Equity securities | 50 |
Totals | 397,576 | $ 401,919
Gross Unrealized Gains |  |
Totals | 6,633 | 3,138
Gross Unrealized Losses |  |
Totals | 2,305 | 4,903
Fair Value |  |
Total debt securities | 401,793 |
Equity securities | 111 |
Totals | 401,904 | 400,154
Debt Securities |  |
Amortized Cost |  |
Total debt securities | 397,526 | 401,869
Gross Unrealized Gains |  |
Total debt securities | 6,572 | 3,097
Gross Unrealized Losses |  |
Total debt securities | 2,305 | 4,903
Fair Value |  |
Total debt securities | 401,793 | 400,063
Debt Securities | U.S. Government Agencies |  |
Amortized Cost |  |
Total debt securities | 7,311 | 39,569
Gross Unrealized Gains |  |
Total debt securities | 23 | 147
Gross Unrealized Losses |  |
Total debt securities | 0 | 124
Fair Value |  |
Total debt securities | 7,334 | 39,592
Debt Securities | States and political subdivisions |  |
Amortized Cost |  |
Total debt securities | 159,185 | 163,677
Gross Unrealized Gains |  |
Total debt securities | 4,640 | 1,782
Gross Unrealized Losses |  |
Total debt securities | 394 | 1,177
Fair Value |  |
Total debt securities | 163,431 | 164,282
Debt Securities | GSE residential MBSs |  |
Amortized Cost |  |
Total debt securities | 103,590 | 116,022
Gross Unrealized Gains |  |
Total debt securities | 1,186 | 928
Gross Unrealized Losses |  |
Total debt securities | 0 | 6
Fair Value |  |
Total debt securities | 104,776 | 116,944
Debt Securities | GSE residential CMOs |  |
Amortized Cost |  |
Total debt securities | 113,339 | 72,411
Gross Unrealized Gains |  |
Total debt securities | 705 | 240
Gross Unrealized Losses |  |
Total debt securities | 1,723 | 3,268
Fair Value |  |
Total debt securities | 112,321 | 69,383
Debt Securities | GSE commercial CMOs |  |
Amortized Cost |  |
Total debt securities | 5,141 | 5,148
Gross Unrealized Gains |  |
Total debt securities | 0 | 0
Gross Unrealized Losses |  |
Total debt securities | 168 | 292
Fair Value |  |
Total debt securities | 4,973 | 4,856
Debt Securities | Private label CMOs |  |
Amortized Cost |  |
Total debt securities | 3,542 | 5,042
Gross Unrealized Gains |  |
Total debt securities | 18 | 0
Gross Unrealized Losses |  |
Total debt securities | 20 | 36
Fair Value |  |
Total debt securities | 3,540 | 5,006
Debt Securities | Asset-backed |  |
Amortized Cost |  |
Total debt securities | 5,418 |
Gross Unrealized Gains |  |
Total debt securities | 0 |
Gross Unrealized Losses |  |
Total debt securities | 0 |
Fair Value |  |
Total debt securities | 5,418 |
Equity Securities |  |
Amortized Cost |  |
Equity securities | 50 | 50
Gross Unrealized Gains |  |
Equity securities | 61 | 41
Gross Unrealized Losses |  |
Equity securities | 0 | 0
Fair Value |  |
Equity securities | $ 111 | $ 91

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