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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, 2016 | Dec. 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Total debt securities, amortized cost | $ 320,719 |
Equity securities, amortized cost | 50 |
Totals, amortized cost | 320,769 | $ 392,279
Totals, gross unrealized gains | 7,397 | 3,885
Totals, gross unrealized losses | 576 | 2,040
Total debt securities, fair value | 327,517 |
Equity securities, fair value | 73 |
Totals, fair value | 327,590 | 394,124
Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total debt securities, amortized cost | 320,719 | 392,229
Total debt securities, gross unrealized gains | 7,374 | 3,862
Total debt securities, gross unrealized losses | 576 | 2,040
Total debt securities, fair value | 327,517 | 394,051
Debt Securities | U.S. Government Agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total debt securities, amortized cost | 45,072 | 47,209
Total debt securities, gross unrealized gains | 188 | 200
Total debt securities, gross unrealized losses | 121 | 182
Total debt securities, fair value | 45,139 | 47,227
Debt Securities | States and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total debt securities, amortized cost | 124,302 | 124,421
Total debt securities, gross unrealized gains | 5,246 | 2,483
Total debt securities, gross unrealized losses | 367 | 943
Total debt securities, fair value | 129,181 | 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 | 129,219 | 132,389
Total debt securities, gross unrealized gains | 1,556 | 229
Total debt securities, gross unrealized losses | 0 | 269
Total debt securities, fair value | 130,775 | 132,349
Debt Securities | GSE residential collateralized mortgage obligations (CMOs) |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total debt securities, amortized cost | 14,040 | 15,668
Total debt securities, gross unrealized gains | 384 | 215
Total debt securities, gross unrealized losses | 20 | 40
Total debt securities, fair value | 14,404 | 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 | 8,086 | 8,944
Total debt securities, gross unrealized gains | 0 | 0
Total debt securities, gross unrealized losses | 68 | 43
Total debt securities, fair value | 8,018 | 8,901
Equity Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity securities, amortized cost | 50 | 50
Equity securities, gross unrealized gains | 23 | 23
Equity securities, gross unrealized losses | 0 | 0
Equity securities, fair value | $ 73 | $ 73

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