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AFS Securities (Amortized cost and fair value of AFS securities, with gross unrealized gains and losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 357,607	$ 325,966
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	9,898	13,262
Gross Unrealized Losses	181	0
AFS securities	367,324	339,228
States and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	136,261	137,710
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	4,133	5,946
Gross Unrealized Losses	65	0
AFS securities	140,329	143,656
Auction rate money market preferred [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,200	3,200
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	24	37
Gross Unrealized Losses	0	0
AFS securities	3,224	3,237
Mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	73,687	85,926
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	2,148	2,726
Gross Unrealized Losses	0	0
AFS securities	75,835	88,652
Collateralized mortgage obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	113,275	97,430
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	3,593	4,553
Gross Unrealized Losses	3	0
AFS securities	116,865	101,983
Corporate Debt Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,700	1,700
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Gross Unrealized Losses	0	0
AFS securities	1,700	$ 1,700
US Treasury Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	29,484
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0
Gross Unrealized Losses	$ 113

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ 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=118939692&loc=d3e27161-111563

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- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ 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
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-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
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-URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454

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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.

+ References

No definition available.

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