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Securities - Maturity of Debt Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Held for Investment, Contractual maturity of debt securities, Amortized Cost
Amortized cost, Within one year	$ 300	$ 300
Amortized cost, After one year but within five years	1,291	1,058
Amortized cost, After five years but within ten years	597	543
Amortized cost, After ten years	1	2
Amortized Cost	2,189	1,903
Available for sale, Contractual maturity of debt securities, Amortized Cost
Amortized Cost, Within one year	276,869	186,373
Amortized Cost, After one year but within five years	254,913	252,519
Amortized Cost, After five years but within ten years	5,035	5,873
Amortized Cost, After ten years	39,739	40,317
Amortized Cost	576,556	485,082
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value
Estimated Fair Value, Within one year	301	300
Estimated Fair Value, After one year but within five years	1,318	1,055
Estimated Fair Value, After five years but within ten years	600	546
Estimated Fair Value, After ten years	1	2
Estimated Fair Value	2,220	1,903
Available for sale, Contractual maturity of debt securities, Estimated Fair Value
Estimated Fair Value, Within one year	277,975	186,539
Estimated Fair Value, After one year but within five years	267,320	257,430
Estimated Fair Value, After five years but within ten years	5,129	6,008
Estimated Fair Value, After ten years	39,374	39,746
Total debt securities	$ 589,798	$ 489,723

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