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INVESTMENT SECURITIES - Summary of Securities Available For Sale With Unrealized Losses (Detail)
$ in Thousands
Dec. 31, 2020
USD ($)
securities
Dec. 31, 2019
USD ($)
securities
Number of Securities    
Less Than 12 Months | securities 7 22
12 Months or More | securities 25 18
Total | securities 32 40
Fair Value    
Less Than 12 Months $ 54,268 $ 178,686
12 Months or More 225,564 172,727
Total 279,832 351,413
Unrealized Losses    
Less Than 12 Months 2,893 1,676
12 Months or More 3,695 4,513
Total $ 6,588 $ 6,189
States and political subdivisions    
Number of Securities    
Less Than 12 Months | securities 1 1
12 Months or More | securities 0 0
Total | securities 1 1
Fair Value    
Less Than 12 Months $ 9,079 $ 6,173
12 Months or More 0 0
Total 9,079 6,173
Unrealized Losses    
Less Than 12 Months 1,125 32
12 Months or More 0 0
Total $ 1,125 $ 32
GSE residential CMOs    
Number of Securities    
Less Than 12 Months | securities 3 5
12 Months or More | securities 0 1
Total | securities 3 6
Fair Value    
Less Than 12 Months $ 23,954 $ 37,158
12 Months or More 0 11,602
Total 23,954 48,760
Unrealized Losses    
Less Than 12 Months 1,071 309
12 Months or More 0 465
Total $ 1,071 $ 774
Non-agency CMOs    
Number of Securities    
Less Than 12 Months | securities   1
12 Months or More | securities   0
Total | securities   1
Fair Value    
Less Than 12 Months   $ 17,087
12 Months or More   0
Total   17,087
Unrealized Losses    
Less Than 12 Months   123
12 Months or More   0
Total   $ 123
Private label commercial CMOs    
Number of Securities    
Less Than 12 Months | securities 1 6
12 Months or More | securities 10 8
Total | securities 11 14
Fair Value    
Less Than 12 Months $ 4,314 $ 26,079
12 Months or More 42,403 39,726
Total 46,717 65,805
Unrealized Losses    
Less Than 12 Months 685 67
12 Months or More 1,077 164
Total $ 1,762 $ 231
Asset-backed    
Number of Securities    
Less Than 12 Months | securities 2 9
12 Months or More | securities 15 9
Total | securities 17 18
Fair Value    
Less Than 12 Months $ 16,921 $ 92,189
12 Months or More 183,161 121,399
Total 200,082 213,588
Unrealized Losses    
Less Than 12 Months 12 1,145
12 Months or More 2,618 3,884
Total $ 2,630 $ 5,029