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Note 4 - Investment Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Securities available-for-sale, amortized cost	$ 1,154,153	$ 1,297,977
Securities available-for-sale, unrealized gains	245	349
Securities available-for-sale, unrealized losses	(123,219)	(153,709)
Securities available-for-sale, fair value	1,031,179	1,144,617
US Treasury Securities and US Government Agencies Debt Securities [Member]
Securities available-for-sale, amortized cost	119,931	122,966
Securities available-for-sale, unrealized gains	0	0
Securities available-for-sale, unrealized losses	(3,662)	(7,927)
Securities available-for-sale, fair value	116,269	115,039
US Government-sponsored Enterprises Debt Securities [Member]
Securities available-for-sale, amortized cost	104,677	149,773
Securities available-for-sale, unrealized gains	157	290
Securities available-for-sale, unrealized losses	(4,987)	(6,437)
Securities available-for-sale, fair value	99,847	143,626
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities available-for-sale, amortized cost	789,145	874,265
Securities available-for-sale, unrealized gains	83	58
Securities available-for-sale, unrealized losses	(101,189)	(121,585)
Securities available-for-sale, fair value	688,039	752,738
US States and Political Subdivisions Debt Securities [Member]
Securities available-for-sale, amortized cost	136,579	145,016
Securities available-for-sale, unrealized gains	5	1
Securities available-for-sale, unrealized losses	(13,094)	(17,418)
Securities available-for-sale, fair value	123,490	127,599
Other Debt Obligations [Member]
Securities available-for-sale, amortized cost	3,821	5,957
Securities available-for-sale, unrealized gains	0	0
Securities available-for-sale, unrealized losses	(287)	(342)
Securities available-for-sale, fair value	$ 3,534	$ 5,615

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://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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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
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
-Paragraph 2
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-Publisher FASB
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-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
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-Section 45
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481830/320-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

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-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

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