Investment Securities - Amortized Cost and Fair Value of Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Amortized Cost
Due in one year or less	$ 4,058
Due after one year through five years	1,897
Due after five years through ten years	44,757
Due after ten years	63,135
Total amortized cost	113,847
Mortgage-backed securities	352,894
Amortized Cost	466,741	$ 372,231
Fair Value
Due in one year or less	4,038
Due after one year through five years	1,937
Due after five years through ten years	44,615
Due after ten years	62,793
Total fair value	113,383
Mortgage-backed securities	356,331
Fair Value	$ 469,714	$ 380,814

Amortized cost 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).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27198-111563