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SECURITIES AVAILABLE FOR SALE - Summary of Securities Available For Sale With Unrealized Losses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fair Value    
Less Than 12 Months $ 139,058 $ 183,310
12 Months or More 24,245 18,376
Total 163,303 201,686
Unrealized Losses    
Less Than 12 Months 4,195 1,430
12 Months or More 708 610
Total 4,903 2,040
U.S. Government Agencies    
Fair Value    
Less Than 12 Months 10,710 27,640
12 Months or More 13,531 0
Total 24,241 27,640
Unrealized Losses    
Less Than 12 Months 23 182
12 Months or More 101 0
Total 124 182
States and political subdivisions    
Fair Value    
Less Than 12 Months 58,924 30,252
12 Months or More 5,075 14,139
Total 63,999 44,391
Unrealized Losses    
Less Than 12 Months 610 373
12 Months or More 567 570
Total 1,177 943
GSE residential mortgage-backed securities    
Fair Value    
Less Than 12 Months 5,034 82,911
12 Months or More 0 0
Total 5,034 82,911
Unrealized Losses    
Less Than 12 Months 6 269
12 Months or More 0 0
Total 6 269
GSE residential collateralized mortgage obligations (CMOs)    
Fair Value    
Less Than 12 Months 59,534 0
12 Months or More 634 4,237
Total 60,168 4,237
Unrealized Losses    
Less Than 12 Months 3,264 0
12 Months or More 4 40
Total 3,268 40
GSE commercial CMOs    
Fair Value    
Less Than 12 Months 4,856 33,606
12 Months or More 0 0
Total 4,856 33,606
Unrealized Losses    
Less Than 12 Months 292 563
12 Months or More 0 0
Total 292 563
Private label CMOs    
Fair Value    
Less Than 12 Months 0 8,901
12 Months or More 5,005 0
Total 5,005 8,901
Unrealized Losses    
Less Than 12 Months 0 43
12 Months or More 36 0
Total $ 36 $ 43