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AFS Securities (Amortized cost and fair value of AFS securities, with gross unrealized gains and losses) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 348,962	$ 423,980
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	14,098	6,687
Gross Unrealized Losses	6	828
AFS securities	363,054	429,839
States and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	142,547	165,005
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	5,854	4,747
Gross Unrealized Losses	0	0
AFS securities	148,401	169,752
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	0	0
Gross Unrealized Losses	6	81
AFS securities	3,194	3,119
Mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	100,984	139,831
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	3,181	933
Gross Unrealized Losses	0	560
AFS securities	104,165	140,204
Collateralized mortgage obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	102,231	115,944
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	5,063	1,007
Gross Unrealized Losses	0	187
AFS securities	$ 107,294	$ 116,764

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-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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-Publisher FASB
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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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