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SECURITIES AVAILABLE FOR SALE - Amortized Cost and Fair Values of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Amortized Cost |  |
Total debt securities | $ 423,699 |
Equity securities | 50 |
Totals | 423,749 | $ 401,919
Gross Unrealized Gains |  |
Totals | 3,962 | 3,138
Gross Unrealized Losses |  |
Totals | 4,110 | 4,903
Fair Value |  |
Total debt securities | 423,499 |
Equity securities | 102 |
Totals | 423,601 | 400,154
Debt Securities |  |
Amortized Cost |  |
Total debt securities | 423,699 | 401,869
Gross Unrealized Gains |  |
Total debt securities | 3,910 | 3,097
Gross Unrealized Losses |  |
Total debt securities | 4,110 | 4,903
Fair Value |  |
Total debt securities | 423,499 | 400,063
Debt Securities | U.S. Government Agencies |  |
Amortized Cost |  |
Total debt securities | 8,541 | 39,569
Gross Unrealized Gains |  |
Total debt securities | 0 | 147
Gross Unrealized Losses |  |
Total debt securities | 50 | 124
Fair Value |  |
Total debt securities | 8,491 | 39,592
Debt Securities | States and political subdivisions |  |
Amortized Cost |  |
Total debt securities | 182,221 | 163,677
Gross Unrealized Gains |  |
Total debt securities | 2,522 | 1,782
Gross Unrealized Losses |  |
Total debt securities | 867 | 1,177
Fair Value |  |
Total debt securities | 183,876 | 164,282
Debt Securities | GSE residential MBSs |  |
Amortized Cost |  |
Total debt securities | 107,928 | 116,022
Gross Unrealized Gains |  |
Total debt securities | 983 | 928
Gross Unrealized Losses |  |
Total debt securities | 0 | 6
Fair Value |  |
Total debt securities | 108,911 | 116,944
Debt Securities | GSE residential CMOs |  |
Amortized Cost |  |
Total debt securities | 115,645 | 72,411
Gross Unrealized Gains |  |
Total debt securities | 400 | 240
Gross Unrealized Losses |  |
Total debt securities | 2,961 | 3,268
Fair Value |  |
Total debt securities | 113,084 | 69,383
Debt Securities | GSE commercial CMOs |  |
Amortized Cost |  |
Total debt securities | 5,144 | 5,148
Gross Unrealized Gains |  |
Total debt securities | 0 | 0
Gross Unrealized Losses |  |
Total debt securities | 205 | 292
Fair Value |  |
Total debt securities | 4,939 | 4,856
Debt Securities | Private label CMOs |  |
Amortized Cost |  |
Total debt securities | 4,220 | 5,042
Gross Unrealized Gains |  |
Total debt securities | 5 | 0
Gross Unrealized Losses |  |
Total debt securities | 27 | 36
Fair Value |  |
Total debt securities | 4,198 | 5,006
Equity Securities |  |
Amortized Cost |  |
Equity securities | 50 | 50
Gross Unrealized Gains |  |
Equity securities | 52 | 41
Gross Unrealized Losses |  |
Equity securities | 0 | 0
Fair Value |  |
Equity securities | $ 102 | $ 91

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