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Investment Securities - Scheduled Maturities of Investment Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]
Available-for-sale, maturing within one year, amortized cost	$ 3,420
Available-for-sale, maturing after one to five years, amortized cost	4,607
Available-for-sale, maturing after five to ten years, amortized cost	43,113
Available-for-sale, maturing after ten years, amortized cost	32,729
Available-for-sale, amortized cost	83,869	$ 94,071
Available-for-sale, maturing within one year, estimated fair value	3,438
Available-for-sale, maturing after one to five years, estimated fair value	4,775
Available-for-sale, maturing after five to ten years, estimated fair value	44,432
Available-for-sale, maturing after ten years, estimated fair value	33,037
Available-for-sale, amortized cost	85,682	94,016
Held-to-maturity, maturing within one year, amortized cost	5
Held-to-maturity, maturing after one to five years, amortized cost	765
Held-to-maturity, maturing after five to ten years, amortized cost	3,099
Held-to-maturity, maturing after ten years, amortized cost	3,854
Held-to-maturity, amortized cost	7,723	14,340
Held-to-maturity, maturing within one year, estimated fair value	5
Held-to-maturity, maturing after one to five years, estimated fair value	781
Held-to-maturity, maturity after five to ten years, estimated fair value	3,156
Held-to-maturity, maturing after ten years, estimated fair value	3,932
Held-to-maturity, amortized cost	$ 7,874	$ 14,306

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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