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Note 5 - Loans and ACL for Loans (Details Textual) | 12 Months Ended
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Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Loans and Leases Receivable, Deferred Expense (Income) |  | $ 2,000,000 | $ 1,000,000
Continuing Involvement with Transferred Financial Assets, Principal Amount Outstanding |  | 4,000,000 | 5,000,000
Financing Receivable, Accrued Interest, after Allowance for Credit Loss |  | 21,000,000 | 17,000,000
Financing Receivable, before Allowance for Credit Loss | [1] | 5,771,038,000 | 5,205,918,000
Financing Receivable, after Allowance for Credit Loss |  | 5,691,664,000 | 5,132,387,000
Financing Receivable, Purchased with Credit Deterioration, Interest Income |  | 5,000,000 | 5,200,000
Financing Receivable, Nonaccrual, Interest Income |  | 0 | 0
Mortgage Loans in Process of Foreclosure, Amount |  | 668,000 | $ 317,000
Financing Receivable, Modifications, Number of Contracts |  |  | 0
Financing Receivable, Troubled Debt Restructuring |  |  | $ 850,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts |  |  | 0
Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 2,469,113,000 | $ 2,231,975,000
Financing Receivable, Modifications, Number of Contracts |  |  | 1
Financing Receivable, Troubled Debt Restructuring |  |  | $ 850,000
Acquisition of Commonwealth [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |
Financing Receivable, after Allowance for Credit Loss |  | 53,000,000 |
Asset Pledged as Collateral [Member] | Federal Home Loan Bank Advances [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 3,150,000,000 | $ 2,770,000,000
[1] | Total loans are presented inclusive of premiums, discounts and net loan origination fees and costs.

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