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Investment Securities - Scheduled Maturities of Investment Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Investments Debt And Equity Securities [Abstract]
Available-for-sale, maturing within one year, amortized cost	$ 89
Available-for-sale, maturing after one to five years, amortized cost	6,759
Available-for-sale, maturing after five to ten years, amortized cost	32,638
Available-for-sale, maturing after ten years, amortized cost	29,056
Available-for-sale, amortized cost	68,542	$ 83,289
Available-for-sale, maturing within one year, estimated fair value	89
Available-for-sale, maturing after one to five years, estimated fair value	6,943
Available-for-sale, maturing after five to ten years, estimated fair value	33,636
Available-for-sale, maturing after ten years, estimated fair value	29,436
Available-for-sale, amortized cost	70,104	84,993
Held-to-maturity, maturing within one year, amortized cost	402
Held-to-maturity, maturing after one to five years, amortized cost	360
Held-to-maturity, maturing after five to ten years, amortized cost	2,391
Held-to-maturity, maturing after ten years, amortized cost	2,526
Held-to-maturity, amortized cost	5,679	6,429
Held-to-maturity, maturing within one year, estimated fair value	409
Held-to-maturity, maturing after one to five years, estimated fair value	363
Held-to-maturity, maturity after five to ten years, estimated fair value	2,450
Held-to-maturity, maturing after ten years, estimated fair value	2,573
Held-to-maturity, amortized cost	$ 5,795	$ 6,559

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Amount of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in next 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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120252992&loc=d3e62586-112803

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (f)(1)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269820-111563

+ Details

Name:	us-gaap_HeldToMaturitySecuritiesFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration