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SECURITIES AVAILABLE FOR SALE - Summary of Amortized Cost and Fair Value by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Amortized Cost    
Due in one year or less $ 0  
Due after one year through five years 8,712  
Due after five years through ten years 49,958  
Due after ten years 95,133  
MBSs and CMOs 171,066  
Asset-backed 86,787  
Total debt securities 411,656  
Equity securities 50  
Totals 411,706 $ 401,919
Fair Value    
Due in one year or less 0  
Due after one year through five years 8,929  
Due after five years through ten years 51,188  
Due after ten years 99,341  
MBSs and CMOs 169,305  
Asset-backed 86,431  
Total debt securities 415,194  
Equity securities 114  
Totals $ 415,308 $ 400,154