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Securities - Maturity of Debt Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Held for Investment, Contractual maturity of debt securities, Amortized Cost    
Amortized cost, Within one year $ 576 $ 807
Amortized cost, After one year but within five years 2,407 2,091
Amortized cost, After five years but within ten years 4 65
Amortized cost, After ten years 1 1
Amortized Cost 2,988 2,964
Available for sale, Contractual maturity of debt securities, Amortized Cost    
Amortized Cost, Within one year 110,293 339,752
Amortized Cost, After one year but within five years 373,494 162,401
Amortized Cost, After five years but within ten years 9,925 3,753
Amortized Cost, After ten years 59,950 36,383
Amortized Cost 553,662 542,289
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value    
Estimated Fair Value, Within one year 576 809
Estimated Fair Value, After one year but within five years 2,409 2,110
Estimated Fair Value, After five years but within ten years 4 64
Estimated Fair Value, After ten years 1 1
Estimated Fair Value 2,990 2,984
Available for sale, Contractual maturity of debt securities, Estimated Fair Value    
Estimated Fair Value, Within one year 111,495 341,102
Estimated Fair Value, After one year but within five years 378,554 171,135
Estimated Fair Value, After five years but within ten years 10,467 3,910
Estimated Fair Value, After ten years 60,267 36,085
Total debt securities $ 560,783 $ 552,232