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SECURITIES AVAILABLE FOR SALE - Gross Unrealized Losses and Fair Value of Company's Available for Sale Securities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Fair Value    
Less Than 12 Months $ 112,325 $ 139,058
12 Months or More 16,377 24,245
Total 128,702 163,303
Unrealized Losses    
Less Than 12 Months 3,727 4,195
12 Months or More 383 708
Total 4,110 4,903
U.S. Government Agencies    
Fair Value    
Less Than 12 Months 0 10,710
12 Months or More 8,491 13,531
Total 8,491 24,241
Unrealized Losses    
Less Than 12 Months 0 23
12 Months or More 50 101
Total 50 124
States and political subdivisions    
Fair Value    
Less Than 12 Months 43,443 58,924
12 Months or More 5,326 5,075
Total 48,769 63,999
Unrealized Losses    
Less Than 12 Months 565 610
12 Months or More 302 567
Total 867 1,177
GSE residential MBSs    
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    
Fair Value    
Less Than 12 Months 63,943 59,534
12 Months or More 551 634
Total 64,494 60,168
Unrealized Losses    
Less Than 12 Months 2,957 3,264
12 Months or More 4 4
Total 2,961 3,268
GSE commercial CMOs    
Fair Value    
Less Than 12 Months 4,939 4,856
12 Months or More 0 0
Total 4,939 4,856
Unrealized Losses    
Less Than 12 Months 205 292
12 Months or More 0 0
Total 205 292
Private label CMOs    
Fair Value    
Less Than 12 Months 0 0
12 Months or More 2,009 5,005
Total 2,009 5,005
Unrealized Losses    
Less Than 12 Months 0 0
12 Months or More 27 36
Total $ 27 $ 36