Investment Securities (Held-to-maturity Securities by Maturities) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	$ 355
Debt securities, maturing 1 to 5 years, amortized cost	2,928
Debt securities, maturing 5 to 10 years, amortized cost	11,166
Debt securities, maturing over 10 years, amortized cost	228,887
Amortized Cost	243,336	$ 66,518
Debt securities, maturing within 1 year, fair value	358
Debt securities, maturing 1 to 5 years, fair value	3,147
Debt securities, maturing 5 to 10 years, fair value	11,638
Debt securities, maturing over 10 years, fair value	224,857
Fair Value	$ 240,000	68,082
Held-to-maturity securities, maturing within 1 year, average yield	2.25%
Held-to-maturity securities, maturing 1 to 5 years, average yield	2.29%
Held-to-maturity securities, maturing 6 to 10 years, average yield	2.37%
Held-to-maturity securities, maturing over 10 years, average yield	2.05%
Held-to-maturity securities, total average yield	2.07%
Debt Securities, Held-to-maturity, Allowance for Credit Loss	$ (236)	(60)
States and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	0
Debt securities, maturing 1 to 5 years, amortized cost	989
Debt securities, maturing 5 to 10 years, amortized cost	2,511
Debt securities, maturing over 10 years, amortized cost	120,917
Amortized Cost	124,417
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	1,132
Debt securities, maturing 5 to 10 years, fair value	2,794
Debt securities, maturing over 10 years, fair value	118,509
Fair Value	122,435	35,484
Debt Securities, Held-to-maturity, Allowance for Credit Loss	(236)	(60)
Residential mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	0
Debt securities, maturing 1 to 5 years, amortized cost	1,939
Debt securities, maturing 5 to 10 years, amortized cost	0
Debt securities, maturing over 10 years, amortized cost	39,096
Amortized Cost	41,035
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	2,015
Debt securities, maturing 5 to 10 years, fair value	0
Debt securities, maturing over 10 years, fair value	39,486
Fair Value	41,501	26,742
Commercial mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	355
Debt securities, maturing 1 to 5 years, amortized cost	0
Debt securities, maturing 5 to 10 years, amortized cost	8,655
Debt securities, maturing over 10 years, amortized cost	38,879
Amortized Cost	47,889
Debt securities, maturing within 1 year, fair value	358
Debt securities, maturing 1 to 5 years, fair value	0
Debt securities, maturing 5 to 10 years, fair value	8,844
Debt securities, maturing over 10 years, fair value	37,715
Fair Value	46,917	$ 5,856
Agency Securities
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	0
Debt securities, maturing 1 to 5 years, amortized cost	0
Debt securities, maturing 5 to 10 years, amortized cost	0
Debt securities, maturing over 10 years, amortized cost	29,995
Amortized Cost	29,995
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	0
Debt securities, maturing 5 to 10 years, fair value	0
Debt securities, maturing over 10 years, fair value	29,147
Fair Value	$ 29,147

Held-to-maturity Securities, Debt Maturities, Average Yield

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Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Weighted average yield of investment in debt security measured at amortized cost (held-to-maturity), maturing in sixth through tenth rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Industry Guide
-Number 3
-Section II
-Paragraph B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1403
-Paragraph (a)
-Subparagraph (3)

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Weighted average yield of investment in debt security measured at amortized cost (held-to-maturity), maturing in second through fifth rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Weighted average yield of investment in debt security measured at amortized cost (held-to-maturity), maturing after tenth fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity).

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Fair value 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 rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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

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Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) with single maturity date and allocated without single maturity date, maturing after rolling tenth fiscal year following current statement of financial position date. For interim and annual periods when interim period is reported on rolling approach.

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Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) with single maturity date and allocated without single maturity date, maturing in sixth through tenth rolling fiscal year following current statement of financial position date. For interim and annual periods when interim period is reported on rolling approach.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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