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Securities - Amortized Cost and Fair Value of Securities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
 [1]
Amortized Cost    
Due within one year $ 1,836  
Due after one year through five years 9,009  
Due after five years through ten years 27,051  
Due after ten years 84,092  
Amortized Cost 121,988  
Fair Value    
Due within one year 1,844  
Due after one year through five years 8,992  
Due after five years through ten years 27,048  
Due after ten years 83,318  
Fair Value 121,202 $ 99,857
Amortized Cost    
Due within one year 185  
Due after one year through five years 4,179  
Due after five years through ten years 4,586  
Due after ten years 10,539  
Amortized Cost 19,489 43,408
Fair Value    
Due within one year 185  
Due after one year through five years 4,159  
Due after five years through ten years 4,565  
Due after ten years 10,281  
Fair Value $ 19,190 $ 42,394
[1] Derived from audited consolidated financial statements.