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SECURITIES AVAILABLE FOR SALE - Summary of Securities Available For Sale With Unrealized Losses (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
security
Dec. 31, 2016
USD ($)
security
Number of Securities    
Less Than 12 Months | security 19 39
12 Months or More | security 6 7
Total | security 25 46
Fair Value    
Less Than 12 Months $ 117,391 $ 139,058
12 Months or More 43,044 24,245
Total 160,435 163,303
Unrealized Losses    
Less Than 12 Months 1,968 4,195
12 Months or More 1,926 708
Total $ 3,894 $ 4,903
U.S. Government Agencies    
Number of Securities    
Less Than 12 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 Than 12 Months | security 7 25
12 Months or More | security 1 1
Total | security 8 26
Fair Value    
Less Than 12 Months $ 24,577 $ 58,924
12 Months or More 5,585 5,075
Total 30,162 63,999
Unrealized Losses    
Less Than 12 Months 473 610
12 Months or More 5 567
Total $ 478 $ 1,177
GSE residential MBSs    
Number of Securities    
Less Than 12 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 Than 12 Months | security 4 6
12 Months or More | security 5 1
Total | security 9 7
Fair Value    
Less Than 12 Months $ 25,155 $ 59,534
12 Months or More 37,459 634
Total 62,614 60,168
Unrealized Losses    
Less Than 12 Months 914 3,264
12 Months or More 1,921 4
Total $ 2,835 $ 3,268
GSE commercial CMOs    
Number of Securities    
Less Than 12 Months | security   1
12 Months or More | security   0
Total | security   1
Fair Value    
Less Than 12 Months   $ 4,856
12 Months or More   0
Total   4,856
Unrealized Losses    
Less Than 12 Months   292
12 Months or More   0
Total   $ 292
Private label commercial CMOs    
Number of Securities    
Less Than 12 Months | security 2  
12 Months or More | security 0  
Total | security 2  
Fair Value    
Less Than 12 Months $ 7,653  
12 Months or More 0  
Total 7,653  
Unrealized Losses    
Less Than 12 Months 156  
12 Months or More 0  
Total $ 156  
Asset-backed    
Number of Securities    
Less Than 12 Months | security 6  
12 Months or More | security 0  
Total | security 6  
Fair Value    
Less Than 12 Months $ 60,006  
12 Months or More 0  
Total 60,006  
Unrealized Losses    
Less Than 12 Months 425  
12 Months or More 0  
Total $ 425  
Private label residential CMOs    
Number of Securities    
Less Than 12 Months | security   0
12 Months or More | security   3
Total | security   3
Fair Value    
Less Than 12 Months   $ 0
12 Months or More   5,005
Total   5,005
Unrealized Losses    
Less Than 12 Months   0
12 Months or More   36
Total   $ 36