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Note 5 - Financial Instruments - Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Equity securities at fair value (Note 2) | $ 8,419 |  | $ 2,896
Securities available for sale (Note 2) | 1,028,115 |  | 574,787
Deposits – noninterest-bearing | 543,165 |  | 477,654
Deposits – interest-bearing | 1,468,985 |  | 1,196,924
Loans to other financial institutions | 38,728 |  | 35,209
Fair Value, Inputs, Level 1 [Member] |  |  |
Securities available for sale (Note 2) | 0 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Securities available for sale (Note 2) | 1,009,082 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |
Securities available for sale (Note 2) | 19,033 |  |
Reported Value Measurement [Member] |  |  |
Cash and cash equivalents | 59,780 |  | 79,519
Equity securities at fair value (Note 2) | 8,419 |  | 2,896
Securities available for sale (Note 2) | 1,028,115 |  | 574,787
Federal Home Loan Bank and Federal Reserve Bank stock | 8,004 |  | 8,004
Loans held for sale | 7,505 |  | 12,921
Loans | 980,602 |  | 1,062,075
Accrued interest receivable | 8,969 |  | 6,521
Interest rate lock commitments | 438 |  | 842
Deposits – noninterest-bearing | 543,165 |  | 477,654
Deposits – interest-bearing | 1,468,985 |  | 1,196,924
Subordinated debentures | 34,956 |  |
Accrued interest payable | 202 |  | 183
Loans to other financial institutions |  | $ 35,209 |
Borrowings |  |  | 9,327
Subordinated debentures |  |  | 3,089
Reported Value Measurement [Member] | Loans to Other Financial Institutions [Member] |  |  |
Loans | 38,728 |  |
Estimate of Fair Value Measurement [Member] |  |  |
Cash and cash equivalents | 59,780 |  | 79,519
Equity securities at fair value (Note 2) | 8,419 |  | 2,896
Securities available for sale (Note 2) | 1,028,115 |  | 574,787
Federal Home Loan Bank and Federal Reserve Bank stock | 8,004 |  | 8,004
Loans held for sale | 7,730 |  | 13,350
Loans | 978,685 |  | 1,057,786
Accrued interest receivable | 8,969 |  | 6,521
Interest rate lock commitments | 438 |  | 842
Deposits – noninterest-bearing | 543,165 |  | 477,654
Deposits – interest-bearing | 1,469,300 |  | 1,197,964
Subordinated debentures | 34,415 |  |
Accrued interest payable | 202 |  | 183
Loans to other financial institutions |  | 35,209 |
Borrowings |  |  | 9,143
Subordinated debentures |  |  | 3,089
Estimate of Fair Value Measurement [Member] | Loans to Other Financial Institutions [Member] |  |  |
Loans | 38,728 |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Cash and cash equivalents | 59,780 |  | 79,519
Equity securities at fair value (Note 2) | 6,723 |  | 1,411
Securities available for sale (Note 2) | 0 |  | 0
Federal Home Loan Bank and Federal Reserve Bank stock | 0 |  | 0
Loans held for sale | 0 |  | 0
Loans | 0 |  | 0
Accrued interest receivable | 0 |  | 0
Interest rate lock commitments | 0 |  | 0
Deposits – noninterest-bearing | 0 |  | 0
Deposits – interest-bearing | 0 |  | 0
Subordinated debentures | 0 |  |
Accrued interest payable | 0 |  | 0
Loans to other financial institutions |  | 0 |
Borrowings |  |  | 0
Subordinated debentures |  |  | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Loans to Other Financial Institutions [Member] |  |  |
Loans | 0 |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Cash and cash equivalents | 0 |  | 0
Equity securities at fair value (Note 2) | 0 |  | 0
Securities available for sale (Note 2) | 1,009,082 |  | 563,364
Federal Home Loan Bank and Federal Reserve Bank stock | 8,004 |  | 8,004
Loans held for sale | 7,730 |  | 13,350
Loans | 0 |  | 0
Accrued interest receivable | 8,969 |  | 6,521
Interest rate lock commitments | 438 |  | 842
Deposits – noninterest-bearing | 543,165 |  | 477,654
Deposits – interest-bearing | 1,469,300 |  | 1,197,964
Subordinated debentures | 34,415 |  |
Accrued interest payable | 202 |  | 183
Loans to other financial institutions |  | 35,209 |
Borrowings |  |  | 9,143
Subordinated debentures |  |  | 3,089
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Loans to Other Financial Institutions [Member] |  |  |
Loans | 38,728 |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Cash and cash equivalents | 0 |  | 0
Equity securities at fair value (Note 2) | 1,696 |  | 1,485
Securities available for sale (Note 2) | 19,033 |  | 11,423
Federal Home Loan Bank and Federal Reserve Bank stock | 0 |  | 0
Loans held for sale | 0 |  | 0
Loans | 978,685 |  | 1,057,786
Accrued interest receivable | 0 |  | 0
Interest rate lock commitments | 0 |  | 0
Deposits – noninterest-bearing | 0 |  | 0
Deposits – interest-bearing | 0 |  | 0
Subordinated debentures | 0 |  |
Accrued interest payable | 0 |  | 0
Loans to other financial institutions |  | $ 0 |
Borrowings |  |  | 0
Subordinated debentures |  |  | $ 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Loans to Other Financial Institutions [Member] |  |  |
Loans | $ 0 |  |

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