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Securities - Maturity of Debt Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Held for Investment, Contractual maturity of debt securities, Amortized Cost    
Amortized cost, Within one year $ 880 $ 300
Amortized cost, After one year but within five years 1,581 1,058
Amortized cost, After five years but within ten years 593 543
Amortized cost, After ten years 1 2
Amortized Cost 3,055 1,903
Available for sale, Contractual maturity of debt securities, Amortized Cost    
Amortized Cost, Within one year 314,154 186,373
Amortized Cost, After one year but within five years 234,514 252,519
Amortized Cost, After five years but within ten years 4,918 5,873
Amortized Cost, After ten years 38,422 40,317
Amortized Cost 592,008 485,082
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value    
Estimated Fair Value, Within one year 879 300
Estimated Fair Value, After one year but within five years 1,574 1,055
Estimated Fair Value, After five years but within ten years 594 546
Estimated Fair Value, After ten years 1 2
Estimated Fair Value 3,048 1,903
Available for sale, Contractual maturity of debt securities, Estimated Fair Value    
Estimated Fair Value, Within one year 315,140 186,539
Estimated Fair Value, After one year but within five years 246,662 257,430
Estimated Fair Value, After five years but within ten years 5,074 6,008
Estimated Fair Value, After ten years 38,100 39,746
Total debt securities $ 604,976 $ 489,723