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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, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 605,165	$ 625,605
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	962	392
Gross Unrealized Losses	37,477	45,516
AFS securities	568,650	580,481
States and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	111,168	122,023
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	938	392
Gross Unrealized Losses	3,387	4,903
AFS securities	108,719	117,512
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	484	858
AFS securities	2,716	2,342
Mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	40,645	42,309
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Gross Unrealized Losses	2,848	3,239
AFS securities	37,797	39,070
Collateralized mortgage obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	210,481	218,301
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	24	0
Gross Unrealized Losses	10,253	12,573
AFS securities	200,252	205,728
Corporate Debt Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	8,150	8,150
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Gross Unrealized Losses	1,070	1,022
AFS securities	7,080	7,128
US Treasury Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	231,521	231,622
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Gross Unrealized Losses	19,435	22,921
AFS securities	$ 212,086	$ 208,701

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126970911&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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- 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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

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-Publisher FASB
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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
-Publisher FASB
-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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