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SECURITIES AVAILABLE FOR SALE - Summary of Securities Available For Sale With Unrealized Losses (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Number of Securities    
Less Than 12 Months | security 46 19
12 Months or More | security 18 6
Total | security 64 25
Fair Value    
Less Than 12 Months $ 200,164 $ 117,391
12 Months or More 86,361 43,044
Total 286,525 160,435
Unrealized Losses    
Less Than 12 Months 2,356 1,968
12 Months or More 3,839 1,926
Total $ 6,195 $ 3,894
States and political subdivisions    
Number of Securities    
Less Than 12 Months | security 27 7
12 Months or More | security 6 1
Total | security 33 8
Fair Value    
Less Than 12 Months $ 46,585 $ 24,577
12 Months or More 23,036 5,585
Total 69,621 30,162
Unrealized Losses    
Less Than 12 Months 662 473
12 Months or More 849 5
Total $ 1,511 $ 478
GSE residential CMOs    
Number of Securities    
Less Than 12 Months | security 1 4
12 Months or More | security 7 5
Total | security 8 9
Fair Value    
Less Than 12 Months $ 18,037 $ 25,155
12 Months or More 46,168 37,459
Total 64,205 62,614
Unrealized Losses    
Less Than 12 Months 122 914
12 Months or More 2,567 1,921
Total $ 2,689 $ 2,835
Private label residential 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 $ 143  
12 Months or More 0  
Total 143  
Unrealized Losses    
Less Than 12 Months 1  
12 Months or More 0  
Total $ 1  
Private label commercial CMOs    
Number of Securities    
Less Than 12 Months | security 11 2
12 Months or More | security 2 0
Total | security 13 2
Fair Value    
Less Than 12 Months $ 56,499 $ 7,653
12 Months or More 6,349 0
Total 62,848 7,653
Unrealized Losses    
Less Than 12 Months 712 156
12 Months or More 209 0
Total $ 921 $ 156
Asset-backed and other    
Number of Securities    
Less Than 12 Months | security 6 6
12 Months or More | security 3 0
Total | security 9 6
Fair Value    
Less Than 12 Months $ 78,900 $ 60,006
12 Months or More 10,808 0
Total 89,708 60,006
Unrealized Losses    
Less Than 12 Months 859 425
12 Months or More 214 0
Total $ 1,073 $ 425