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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, 2016 | Dec. 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Total debt securities, amortized cost | $ 313,073 |
Equity securities, amortized cost | 50 |
Totals, amortized cost | 313,123 | $ 392,279
Totals, gross unrealized gains | 11,747 | 3,885
Totals, gross unrealized losses | 330 | 2,040
Total debt securities, fair value | 324,465 |
Equity securities, fair value | 75 |
Totals, fair value | 324,540 | 394,124
Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total debt securities, amortized cost | 313,073 | 392,229
Total debt securities, gross unrealized gains | 11,722 | 3,862
Total debt securities, gross unrealized losses | 330 | 2,040
Total debt securities, fair value | 324,465 | 394,051
Debt Securities | U.S. Government Agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total debt securities, amortized cost | 43,330 | 47,209
Total debt securities, gross unrealized gains | 199 | 200
Total debt securities, gross unrealized losses | 135 | 182
Total debt securities, fair value | 43,394 | 47,227
Debt Securities | States and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total debt securities, amortized cost | 123,818 | 124,421
Total debt securities, gross unrealized gains | 8,478 | 2,483
Total debt securities, gross unrealized losses | 113 | 943
Total debt securities, fair value | 132,183 | 125,961
Debt Securities | U.S. Government Sponsored Enterprises (GSE) residential mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total debt securities, amortized cost | 126,213 | 132,389
Total debt securities, gross unrealized gains | 2,662 | 229
Total debt securities, gross unrealized losses | 0 | 269
Total debt securities, fair value | 128,875 | 132,349
Debt Securities | GSE residential collateralized mortgage obligations (CMOs) |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total debt securities, amortized cost | 12,363 | 15,668
Total debt securities, gross unrealized gains | 383 | 215
Total debt securities, gross unrealized losses | 9 | 40
Total debt securities, fair value | 12,737 | 15,843
Debt Securities | GSE commercial CMOs |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total debt securities, amortized cost |  | 63,598
Total debt securities, gross unrealized gains |  | 735
Total debt securities, gross unrealized losses |  | 563
Total debt securities, fair value |  | 63,770
Debt Securities | Private label CMOs |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total debt securities, amortized cost | 7,349 | 8,944
Total debt securities, gross unrealized gains | 0 | 0
Total debt securities, gross unrealized losses | 73 | 43
Total debt securities, fair value | 7,276 | 8,901
Equity Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity securities, amortized cost | 50 | 50
Equity securities, gross unrealized gains | 25 | 23
Equity securities, gross unrealized losses | 0 | 0
Equity securities, fair value | $ 75 | $ 73

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