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SECURITIES AVAILABLE FOR SALE - Gross Unrealized Losses and Fair Value of Company's Available for Sale Securities (Detail)
$ in Thousands
Jun. 30, 2017
USD ($)
security
Dec. 31, 2016
USD ($)
security
Number of Securities    
Less than12 months | security 16 39
12 Months or More | security 4 7
Total | security 20 46
Fair Value    
Less Than 12 Months $ 82,116 $ 139,058
12 Months or More 9,518 24,245
Total 91,634 163,303
Unrealized Losses    
Less Than 12 Months 2,052 4,195
12 Months or More 253 708
Total $ 2,305 $ 4,903
U.S. Government Agencies    
Number of Securities    
Less than12 months | security   6
12 Months or More | security   2
Total | security   8
Fair Value    
Less Than 12 Months   $ 10,710
12 Months or More   13,531
Total   24,241
Unrealized Losses    
Less Than 12 Months   23
12 Months or More   101
Total   $ 124
States and political subdivisions    
Number of Securities    
Less than12 months | security 9 25
12 Months or More | security 1 1
Total | security 10 26
Fair Value    
Less Than 12 Months $ 19,752 $ 58,924
12 Months or More 5,469 5,075
Total 25,221 63,999
Unrealized Losses    
Less Than 12 Months 246 610
12 Months or More 148 567
Total $ 394 $ 1,177
GSE residential MBSs    
Number of Securities    
Less than12 months | security   1
12 Months or More | security   0
Total | security   1
Fair Value    
Less Than 12 Months   $ 5,034
12 Months or More   0
Total   5,034
Unrealized Losses    
Less Than 12 Months   6
12 Months or More   0
Total   $ 6
GSE residential CMOs    
Number of Securities    
Less than12 months | security 6 6
12 Months or More | security 2 1
Total | security 8 7
Fair Value    
Less Than 12 Months $ 57,391 $ 59,534
12 Months or More 2,781 634
Total 60,172 60,168
Unrealized Losses    
Less Than 12 Months 1,638 3,264
12 Months or More 85 4
Total $ 1,723 $ 3,268
GSE commercial CMOs    
Number of Securities    
Less than12 months | security 1 1
12 Months or More | security 0 0
Total | security 1 1
Fair Value    
Less Than 12 Months $ 4,973 $ 4,856
12 Months or More 0 0
Total 4,973 4,856
Unrealized Losses    
Less Than 12 Months 168 292
12 Months or More 0 0
Total $ 168 $ 292
Private label CMOs    
Number of Securities    
Less than12 months | security 0 0
12 Months or More | security 1 3
Total | security 1 3
Fair Value    
Less Than 12 Months $ 0 $ 0
12 Months or More 1,268 5,005
Total 1,268 5,005
Unrealized Losses    
Less Than 12 Months 0 0
12 Months or More 20 36
Total $ 20 $ 36