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Investment Securities - Scheduled Maturities of Investment Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]
Available-for-sale, maturing within one year, amortized cost	$ 3,493
Available-for-sale, maturing after one to five years, amortized cost	4,655
Available-for-sale, maturing after five to ten years, amortized cost	47,024
Available-for-sale, maturing after ten years, amortized cost	37,665
Available-for-sale, amortized cost	92,837	$ 94,071
Available-for-sale, maturing within one year, estimated fair value	3,523
Available-for-sale, maturing after one to five years, estimated fair value	4,802
Available-for-sale, maturing after five to ten years, estimated fair value	48,326
Available-for-sale, maturing after ten years, estimated fair value	38,007
Available-for-sale, amortized cost	94,658	94,016
Held-to-maturity, maturing within one year, amortized cost	22
Held-to-maturity, maturing after one to five years, amortized cost	765
Held-to-maturity, maturing after five to ten years, amortized cost	3,594
Held-to-maturity, maturing after ten years, amortized cost	4,925
Held-to-maturity, amortized cost	9,306	14,340
Held-to-maturity, maturing within one year, estimated fair value	22
Held-to-maturity, maturing after one to five years, estimated fair value	783
Held-to-maturity, maturity after five to ten years, estimated fair value	3,659
Held-to-maturity, maturing after ten years, estimated fair value	5,005
Held-to-maturity, amortized cost	$ 9,469	$ 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