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Note 2 - Securities - Fair Value of Securities Available for Sale and The Related Unrealized Gains and Losses Recognized in Accumulated Comprehensive Income (Details) $ in Thousands	Sep. 30, 2022 USD ($)
Less than 12 months, fair value	$ 175,768
Less than 12 months, unrealized losses	33,184
Fair value, more than 12 months	174,841
Unrealized loss, more than 12 months	43,163
Fair value	350,609
Unrealized losses	76,347
Less than 12 months, fair value	175,768
Fair value	350,609
US Government Agencies Debt Securities [Member]
Less than 12 months, fair value	0
Less than 12 months, unrealized losses	0
Fair value, more than 12 months	2,550
Unrealized loss, more than 12 months	415
Fair value	2,550
Unrealized losses	415
Less than 12 months, fair value	0
Fair value	2,550
US Treasury Securities [Member]
Less than 12 months, fair value	0
Less than 12 months, unrealized losses	0
Fair value, more than 12 months	0
Unrealized loss, more than 12 months	0
Fair value	0
Unrealized losses	0
Less than 12 months, fair value	0
Fair value	0
US States and Political Subdivisions Debt Securities [Member]
Less than 12 months, fair value	105,390
Less than 12 months, unrealized losses	25,177
Fair value, more than 12 months	54,531
Unrealized loss, more than 12 months	17,308
Fair value	159,921
Unrealized losses	42,485
Less than 12 months, fair value	105,390
Fair value	159,921
Collateralized Mortgage-Backed Securities [Member]
Less than 12 months, fair value	59,007
Less than 12 months, unrealized losses	6,495
Fair value, more than 12 months	111,828
Unrealized loss, more than 12 months	24,801
Fair value	170,835
Unrealized losses	31,296
Less than 12 months, fair value	59,007
Fair value	170,835
Corporate Debt Securities [Member]
Less than 12 months, fair value	11,371
Less than 12 months, unrealized losses	1,512
Fair value, more than 12 months	4,909
Unrealized loss, more than 12 months	556
Fair value	16,280
Unrealized losses	2,068
Less than 12 months, fair value	11,371
Fair value	16,280
Asset-Backed Securities [Member]
Less than 12 months, fair value	0
Less than 12 months, unrealized losses	0
Fair value, more than 12 months	1,023
Unrealized loss, more than 12 months	83
Fair value	1,023
Unrealized losses	83
Less than 12 months, fair value	0
Fair value	$ 1,023

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

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

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