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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
Sep. 30, 2016
Dec. 31, 2015
Fair Value    
Less Than 12 Months $ 74,958 $ 183,310
12 Months or More 20,397 18,376
Total 95,355 201,686
Unrealized Losses    
Less Than 12 Months 1,843 1,430
12 Months or More 279 610
Total 2,122 2,040
U.S. Government Agencies    
Fair Value    
Less Than 12 Months 5,875 27,640
12 Months or More 14,233 0
Total 20,108 27,640
Unrealized Losses    
Less Than 12 Months 12 182
12 Months or More 70 0
Total 82 182
States and political subdivisions    
Fair Value    
Less Than 12 Months 0 30,252
12 Months or More 5,452 14,139
Total 5,452 44,391
Unrealized Losses    
Less Than 12 Months 0 373
12 Months or More 202 570
Total 202 943
GSE residential mortgage-backed securities    
Fair Value    
Less Than 12 Months   82,911
12 Months or More   0
Total   82,911
Unrealized Losses    
Less Than 12 Months   269
12 Months or More   0
Total   269
GSE residential collateralized mortgage obligations (CMOs)    
Fair Value    
Less Than 12 Months 63,107 0
12 Months or More 712 4,237
Total 63,819 4,237
Unrealized Losses    
Less Than 12 Months 1,779 0
12 Months or More 7 40
Total 1,786 40
GSE commercial CMOs    
Fair Value    
Less Than 12 Months   33,606
12 Months or More   0
Total   33,606
Unrealized Losses    
Less Than 12 Months   563
12 Months or More   0
Total   563
Private label CMOs    
Fair Value    
Less Than 12 Months 5,976 8,901
12 Months or More 0 0
Total 5,976 8,901
Unrealized Losses    
Less Than 12 Months 52 43
12 Months or More 0 0
Total $ 52 $ 43