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Note 15 - Disclosure of Financial Instruments Not Reported at Fair Value - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Cash and cash equivalents |  | $ 316,998 | $ 167,367
Accrued interest receivable |  | 20,561 | 22,157
Non-interest bearing deposits |  | 1,845,302 | 1,950,198
Time deposits | [1] | 612,626 | 472,091
Accrued interest payable |  | 1,029 | 660
Reported Value Measurement [Member] |  |  |
Cash and cash equivalents |  | 316,998 | 167,367
HTM debt securities |  | 468,751 | 473,217
Federal Home Loan Bank stock |  | 23,226 | 10,928
Loans, net |  | 5,167,431 | 5,132,387
Accrued interest receivable |  | 20,561 | 22,157
Non-interest bearing deposits |  | 1,845,302 | 1,950,198
Transaction deposits |  | 3,899,267 | 3,968,963
Time deposits |  | 612,626 | 472,091
Securities sold under agreement to repurchase |  | 104,578 | 133,342
Federal funds purchased |  | 14,745 | 8,789
Subordinated debentures |  | 26,442 | 26,343
FHLB advances |  | 275,000 | 50,000
Accrued interest payable |  | 1,029 | 660
Estimate of Fair Value Measurement [Member] |  |  |
Cash and cash equivalents |  | 316,998 | 167,367
HTM debt securities |  | 433,900 | 431,833
Federal Home Loan Bank stock |  | 23,226 | 10,928
Loans, net |  | 4,948,173 | 4,914,770
Accrued interest receivable |  | 20,561 | 22,157
Non-interest bearing deposits |  | 1,845,302 | 1,950,198
Transaction deposits |  | 3,899,267 | 3,968,963
Time deposits |  | 602,758 | 459,467
Securities sold under agreement to repurchase |  | 104,578 | 133,342
Federal funds purchased |  | 14,745 | 8,789
Subordinated debentures |  | 26,492 | 26,460
FHLB advances |  | 275,188 | 50,000
Accrued interest payable |  | 1,029 | 660
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Cash and cash equivalents |  | 316,998 | 167,367
HTM debt securities |  | 0 | 0
Federal Home Loan Bank stock |  | 0 | 0
Loans, net |  | 0 | 0
Accrued interest receivable |  | 20,561 | 22,157
Non-interest bearing deposits |  | 1,845,302 | 1,950,198
Transaction deposits |  | 0 | 0
Time deposits |  | 0 | 0
Securities sold under agreement to repurchase |  | 0 | 0
Federal funds purchased |  | 0 | 0
Subordinated debentures |  | 0 | 0
FHLB advances |  | 0 | 0
Accrued interest payable |  | 1,029 | 660
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Cash and cash equivalents |  | 0 | 0
HTM debt securities |  | 433,900 | 431,833
Federal Home Loan Bank stock |  | 23,226 | 10,928
Loans, net |  | 0 | 0
Accrued interest receivable |  | 0 | 0
Non-interest bearing deposits |  | 0 | 0
Transaction deposits |  | 3,899,267 | 3,968,963
Time deposits |  | 602,758 | 459,467
Securities sold under agreement to repurchase |  | 104,578 | 133,342
Federal funds purchased |  | 14,745 | 8,789
Subordinated debentures |  | 26,492 | 26,460
FHLB advances |  | 275,188 | 50,000
Accrued interest payable |  | 0 | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Cash and cash equivalents |  | 0 | 0
HTM debt securities |  | 0 | 0
Federal Home Loan Bank stock |  | 0 | 0
Loans, net |  | 4,948,173 | 4,914,770
Accrued interest receivable |  | 0 | 0
Non-interest bearing deposits |  | 0 | 0
Transaction deposits |  | 0 | 0
Time deposits |  | 0 | 0
Securities sold under agreement to repurchase |  | 0 | 0
Federal funds purchased |  | 0 | 0
Subordinated debentures |  | 0 | 0
FHLB advances |  | 0 | 0
Accrued interest payable |  | $ 0 | $ 0
[1] | Includes $2.3 million and $599,000 in brokered deposits as of March 31, 2023 and December 31, 2022, respectively.

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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity).. + References No definition available. + Details
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- Definition Represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount shown on the entity's books for investments made in Federal Home Loan Bank stock and other securities. + References No definition available. + Details
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- Definition The sum of cash and cash equivalents plus Federal Funds Sold. Cash and cash equivalents consist of short term, highly liquid investments that are readily convertible to known amounts of cash and are so near their maturity that they present negligible risk of changes in value due to changes in interest rates -- usually with an original maturity less than 90 days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.1,2,3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition Fair value portion of short term borrowing where a bank borrows, at the federal funds rate, from another bank. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(3)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition Amount of interest payable on debt, including, but not limited to, trade payables. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 310 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480833/946-310-45-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)(a)(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Publisher FASB -URI https://asc.fasb.org//310-10/tableOfContent + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition The aggregate amount of all domestic and foreign noninterest-bearing deposits liabilities held by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-10 + Details
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