Quarterly report pursuant to Section 13 or 15(d)

Securities - Schedule of Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity (Detail)

v3.19.1
Securities - Schedule of Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]    
Available-for-Sale Within one year, Amortized Cost $ 32,693  
Available-for-Sale Over one year through five years, Amortized Cost 146,323  
Available-for-Sale Over five years through ten years, Amortized Cost 232,279  
Available-for-Sale Over ten years, Amortized Cost 212,817  
Amortized Cost 624,112 $ 583,444
Available-for-Sale Within one year, Estimated Fair Value 32,694  
Available-for-Sale Over one year through five years, Estimated Fair Value 145,744  
Available-for-Sale Over five years through ten years, Estimated Fair Value 231,518  
Available-for-Sale Over ten years, Estimated Fair Value 211,514  
Estimated fair value $ 621,470 $ 574,908