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Note 2 - Investment Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Due within one year, AFS, amortized cost	$ 126,474
Due within one year, AFS, fair value	125,324
Due within one year, HTM, carrying value	151,581
Due within one year, HTM, fair value	148,335
Due after one year but within five years, AFS, amortized cost	37,332
Due after one year but within five years, AFS, fair value	35,103
Due after one year but within five years, HTM, carrying value	2,650
Due after one year but within five years, HTM, fair value	2,515
Due after five years but within 10 years, AFS, amortized cost	81,673
Due after five years but within 10 years, AFS, fair value	70,746
Due after five years but within 10 years, HTM, carrying value	25,512
Due after five years but within 10 years, HTM, fair value	22,913
Due after 10 years, AFS, amortized cost	105,416
Due after 10 years, AFS, fair value	98,375
Due after 10 years, HTM, carrying value	504
Due after 10 years, HTM, fair value	494
Mortgage-backed securities – government agencies, AFS, amortized cost	740,453
Mortgage-backed securities – government agencies, AFS, fair value	632,080
Mortgage backed securities - government agencies, HTM, carrying value	200,479
Mortgage backed securities - government agencies, HTM, fair value	173,629
Total available for sale debt securities, amortized cost	1,091,348	$ 1,154,153
Total available for sale debt securities, fair value	961,628	1,031,179
Total held to maturity debt securities, carrying value	380,726
Total held to maturity debt securities, fair value	$ 347,886	$ 408,519

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- Definition

Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) with single maturity date and allocated without single maturity date, maturing in sixth through tenth rolling fiscal year following current statement of financial position date. For interim and annual periods when interim period is reported on rolling approach.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 320
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477268/942-320-50-3

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- Definition

Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) with single maturity date and allocated without single maturity date, maturing in second through fifth rolling fiscal year following current statement of financial position date. For interim and annual periods when interim period is reported on rolling approach.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 320
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477268/942-320-50-3

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