Securities - Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity (Details) $ in Thousands	Jun. 30, 2021 USD ($)
Amortized Cost
Less than one year	$ 95,776
Due after one year through five years	177,734
Due after five years through ten years	195,691
Due after ten years	151,077
Total amortized cost	620,278
Estimated Fair Value
Less than one year	96,440
Due after one year through five years	181,538
Due after five years through ten years	195,161
Due after ten years	158,282
Total estimated fair value	$ 631,421

Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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