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Investment Securities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Marketable Securities [Line Items]
Amortized Cost		$ 345,580	$ 283,648
Available-for-sale Securities, Gross Unrealized Gain	$ 124,300	14,554	4,153
Gross Unrealized Losses		268	1,001
Available-for-sale Securities		359,866	286,800
US Treasury Securities [Member]
Marketable Securities [Line Items]
Amortized Cost		1,501	7,190
Available-for-sale Securities, Gross Unrealized Gain		1	16
Gross Unrealized Losses		0	3
Available-for-sale Securities		1,502	7,203
US Government-sponsored Enterprises Debt Securities [Member]
Marketable Securities [Line Items]
Amortized Cost		996	984
Available-for-sale Securities, Gross Unrealized Gain		10	17
Gross Unrealized Losses		0	0
Available-for-sale Securities		1,006	1,001
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Marketable Securities [Line Items]
Amortized Cost		222,739	182,736
Available-for-sale Securities, Gross Unrealized Gain		7,375	1,490
Gross Unrealized Losses		185	640
Available-for-sale Securities		229,929	183,586
Small Business Administration pools [Member]
Marketable Securities [Line Items]
Amortized Cost		34,577	45,301
Available-for-sale Securities, Gross Unrealized Gain		928	259
Gross Unrealized Losses		7	217
Available-for-sale Securities		35,498	45,343
US States and Political Subdivisions Debt Securities [Member]
Marketable Securities [Line Items]
Amortized Cost		82,495	47,418
Available-for-sale Securities, Gross Unrealized Gain		6,184	2,371
Gross Unrealized Losses		76	141
Available-for-sale Securities		88,603	49,648
Corporate and other securities [Member]
Marketable Securities [Line Items]
Amortized Cost		3,272	19
Available-for-sale Securities, Gross Unrealized Gain		56	0
Gross Unrealized Losses		0	0
Available-for-sale Securities		$ 3,328	$ 19

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

No definition available.

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- Definition

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+ References

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- Definition

Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563

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Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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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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