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AFS Securities (Amortized cost and fair value of AFS securities, with gross unrealized gains and losses) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 485,710	$ 325,966
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	7,832	13,262
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	2,941	0
Debt Securities, Available-for-sale	490,601	339,228
States and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	116,836	137,710
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	4,457	5,946
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	88	0
Debt Securities, Available-for-sale	121,205	143,656
Auction rate money market preferred [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,200	3,200
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	42	37
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale	3,242	3,237
Mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	54,710	85,926
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,438	2,726
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale	56,148	88,652
Collateralized mortgage obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	90,435	97,430
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,876	4,553
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	10	0
Debt Securities, Available-for-sale	92,301	101,983
Corporate Debt Securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	8,150	1,700
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	19	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	167	0
Debt Securities, Available-for-sale	8,002	$ 1,700
US Treasury Securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	212,379
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	2,676
Debt Securities, Available-for-sale	$ 209,703

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=123581744&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

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-Publisher FASB
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-SubTopic 10
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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)
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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
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-Name Accounting Standards Codification
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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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