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Securities - Maturity of Debt Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Held for Investment, Contractual maturity of debt securities, Amortized Cost    
Amortized cost, Within one year $ 495 $ 1,036
Amortized cost, After one year but within five years 369 623
Amortized cost, After five years but within ten years 562 625
Amortized cost, After ten years 2 8
Amortized Cost 1,428 2,292
Available for sale, Contractual maturity of debt securities, Amortized Cost    
Amortized Cost, Within one year 411,256 113,225
Amortized Cost, After one year but within five years 313,416 289,038
Amortized Cost, After five years but within ten years 7,524 6,222
Amortized Cost, After ten years 41,378 55,813
Amortized Cost 773,574 464,298
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value    
Estimated Fair Value, Within one year 495 1,034
Estimated Fair Value, After one year but within five years 370 627
Estimated Fair Value, After five years but within ten years 565 633
Estimated Fair Value, After ten years 3 9
Estimated Fair Value 1,433 2,303
Available for sale, Contractual maturity of debt securities, Estimated Fair Value    
Estimated Fair Value, Within one year 410,327 112,974
Estimated Fair Value, After one year but within five years 311,924 287,058
Estimated Fair Value, After five years but within ten years 7,685 6,500
Estimated Fair Value, After ten years 40,768 55,467
Total debt securities $ 770,704 $ 461,999