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Investment Securities - Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Held to Maturity, Amortized Cost, Within one year	$ 246	$ 1,807
Held to Maturity, Amortized Cost, After one but within five years	7,550	2,256
Held to Maturity, Amortized Cost, After five years through ten years	52,113	56,221
Held to Maturity, Amortized Cost, After ten years	49,127	77,129
Held to Maturity, Amortized Cost, Total	109,036	137,413
Held to Maturity, Fair Value, Within one year	250	1,811
Held to Maturity, Fair Value, After one but within five years	7,961	2,296
Held to Maturity, Fair Value, After five years through ten years	55,872	57,544
Held to Maturity, Fair Value, After ten years	51,102	77,991
Held-to-Maturity, Fair Value, Total	115,185	139,642
Available for Sale, Amortized Cost, Within one year	11,530	6,699
Available for Sale, Amortized Cost, After one but within five years	59,028	48,706
Available For Sale, Amortized Cost, After five years through ten years	144,908	208,806
Available for Sale, Amortized Cost, After ten years	157,572	159,712
Amortized Cost	373,038	423,923
Available for Sale, Fair Value, Within one year	11,687	6,706
Available for Sale, Fair Value, After one but within five years	62,397	49,619
Available for Sale, Fair Value, After five years through ten years	154,089	214,277
Available for Sale, Fair Value, After ten years	164,178	161,658
Available for Sale, Fair Value, Total	$ 392,351	$ 432,260

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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