v3.26.1
Note 3 - Loans Receivable (Details Textual)
Pure in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Financing Receivable, before Allowance for Credit Loss $ 1,683,881,000   $ 1,683,881,000     $ 1,675,552,000    
Financing Receivable, Nonaccrual 6,536,000   6,536,000     6,175,000    
Financing Receivable, Allowance for Credit Loss $ 17,884,000 $ 17,800,000 $ 17,884,000 $ 17,800,000 $ 17,709,000 17,478,000 $ 17,905,000 $ 18,247,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts 0 0 0 0        
Unfunded Loan Commitment [Member]                
Financing Receivable, Allowance for Credit Loss $ 861,000   $ 861,000     740,000    
One to Four Family [Member] | Residential Portfolio Segment [Member]                
Financing Receivable, before Allowance for Credit Loss 460,495,000   460,495,000     486,072,000    
Financing Receivable, Nonaccrual 6,179,000   6,179,000     5,861,000    
Financing Receivable, Allowance for Credit Loss 4,435,000 $ 5,110,000 4,435,000 $ 5,110,000 $ 4,446,000 4,916,000 $ 4,979,000 $ 5,286,000
Mortgage Loans in Process of Foreclosure, Amount 1,500,000   1,500,000     1,900,000    
Financial Asset, 1 to 59 Days Past Due [Member]                
Financing Receivable, before Allowance for Credit Loss [1] 4,843,000   4,843,000     7,248,000    
Financing Receivable, Nonaccrual 785,000   785,000     819,000    
Financial Asset, 1 to 59 Days Past Due [Member] | One to Four Family [Member] | Residential Portfolio Segment [Member]                
Financing Receivable, before Allowance for Credit Loss [1] 4,077,000   4,077,000     6,072,000    
Financial Asset, 60 to 89 Days Past Due [Member]                
Financing Receivable, before Allowance for Credit Loss [2] 1,482,000   1,482,000     2,327,000    
Financing Receivable, Nonaccrual 462,000   462,000     0    
Financial Asset, 60 to 89 Days Past Due [Member] | One to Four Family [Member] | Residential Portfolio Segment [Member]                
Financing Receivable, before Allowance for Credit Loss [2] 1,030,000   1,030,000     2,327,000    
Financial Asset, Not Past Due [Member]                
Financing Receivable, before Allowance for Credit Loss [3] 1,673,258,000   1,673,258,000     1,661,145,000    
Financing Receivable, Nonaccrual 991,000   991,000     523,000    
Financial Asset, Not Past Due [Member] | One to Four Family [Member] | Residential Portfolio Segment [Member]                
Financing Receivable, before Allowance for Credit Loss [3] 451,329,000   451,329,000     472,841,000    
Federal Home Loan Bank of Chicago [Member]                
Federal Home Loan Bank, Advance 405,391,000   405,391,000     406,084,000    
Asset Pledged as Collateral [Member] | Federal Home Loan Bank Advances [Member]                
Financing Receivable, before Allowance for Credit Loss $ 1,240,000,000   $ 1,240,000,000     $ 1,270,000,000    
[1] Includes $785,000 and $819,000 at June 30, 2026 and December 31, 2025, respectively, which are on non-accrual status.
[2] Includes $462,000 and $ - at June 30, 2026 and December 31, 2025, respectively, which are on non-accrual status.
[3] Includes $991,000 and $523,000 at June 30, 2026 and December 31, 2025, respectively, which are on non-accrual status.