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Note 2 - Securities - Debt Securities Held to Maturity with Unrealized Losses Aggregated by Investment Category and Time with Unrealized Loss Position (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Held to maturity, less than 12 months, fair value	$ 44,335
Held to maturity, less than 12 months, unrealized losses	3,324
Held to maturity, more than 12 months, fair value	308,253
Held to maturity, more than 12 months, unrealized losses	68,682
Held to maturity, total, fair value	352,588
Held to maturity, total, unrealized losses	72,006
US Treasury and Government [Member]
Held to maturity, less than 12 months, fair value	0
Held to maturity, less than 12 months, unrealized losses	0
Held to maturity, more than 12 months, fair value	2,545
Held to maturity, more than 12 months, unrealized losses	421
Held to maturity, total, fair value	2,545
Held to maturity, total, unrealized losses	421
US States and Political Subdivisions Debt Securities [Member]
Held to maturity, less than 12 months, fair value	13,457
Held to maturity, less than 12 months, unrealized losses	1,899
Held to maturity, more than 12 months, fair value	149,016
Held to maturity, more than 12 months, unrealized losses	37,456
Held to maturity, total, fair value	162,473
Held to maturity, total, unrealized losses	39,355
Collateralized Mortgage-Backed Securities [Member]
Held to maturity, less than 12 months, fair value	25,582
Held to maturity, less than 12 months, unrealized losses	822
Held to maturity, more than 12 months, fair value	145,024
Held to maturity, more than 12 months, unrealized losses	29,046
Held to maturity, total, fair value	170,606
Held to maturity, total, unrealized losses	29,868
Corporate Debt Securities [Member]
Held to maturity, less than 12 months, fair value	5,296
Held to maturity, less than 12 months, unrealized losses	603
Held to maturity, more than 12 months, fair value	10,771
Held to maturity, more than 12 months, unrealized losses	1,682
Held to maturity, total, fair value	16,067
Held to maturity, total, unrealized losses	2,285
Asset-Backed Securities [Member]
Held to maturity, less than 12 months, fair value	0
Held to maturity, less than 12 months, unrealized losses	0
Held to maturity, more than 12 months, fair value	897
Held to maturity, more than 12 months, unrealized losses	77
Held to maturity, total, fair value	897
Held to maturity, total, unrealized losses	$ 77

X

- Definition

Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for 12 months or longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563

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- Definition

Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563

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- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for less than 12 months.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
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-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563

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-Topic 320
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-Section 50
-Paragraph 7
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), in continuous unrealized loss position for less than 12 months.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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