v3.26.1
Securities - Amortized Cost, Fair Value and Allowance for Credit Loss on Securities Held-to-Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Securities [Abstract]            
Amortized cost, total securities held-to-maturity [1] $ 814,864   $ 776,695      
Unrealized gains 11,724   10,381      
Unrealized losses 41,510   48,942      
Fair value 785,078   738,134      
Allowance 550 $ 616 548 $ 422 $ 439 $ 483
Net carrying value 814,314   776,147      
Accrued interest receivable 7,000   4,900      
U.S. Treasury Securities [Member]            
Securities [Abstract]            
Amortized cost, total securities held-to-maturity [1] 13,890   15,850      
Unrealized gains 0   0      
Unrealized losses 633   868      
Fair value 13,257   14,982      
Allowance 0   0      
Net carrying value 13,890   15,850      
State and Political Subdivisions [Member]            
Securities [Abstract]            
Amortized cost, total securities held-to-maturity [1] 479,636   460,959      
Unrealized gains 10,492   8,938      
Unrealized losses 27,595   32,028      
Fair value 462,533   437,869      
Allowance 52   40      
Net carrying value 479,584   460,919      
Mortgage-backed Securities-Residential [Member]            
Securities [Abstract]            
Amortized cost, total securities held-to-maturity [1] 171,074   138,468      
Unrealized gains 1,066   1,388      
Unrealized losses 2,489   2,327      
Fair value 169,651   137,529      
Allowance 0   0      
Net carrying value 171,074   138,468      
Mortgage-backed Securities-Multi-family [Member]            
Securities [Abstract]            
Amortized cost, total securities held-to-maturity [1] 121,738   130,119      
Unrealized gains 0   0      
Unrealized losses 9,727   11,963      
Fair value 112,011   118,156      
Allowance 0   0      
Net carrying value 121,738   130,119      
Corporate Debt Securities [Member]            
Securities [Abstract]            
Amortized cost, total securities held-to-maturity [1] 28,500   31,270      
Unrealized gains 166   55      
Unrealized losses 1,066   1,756      
Fair value 27,600   29,569      
Allowance 497   507      
Net carrying value 28,003   30,763      
Other Securities [Member]            
Securities [Abstract]            
Amortized cost, total securities held-to-maturity [1] 26   29      
Unrealized gains 0   0      
Unrealized losses 0   0      
Fair value 26   29      
Allowance 1   1      
Net carrying value $ 25   $ 28      
[1] Amortized cost excludes accrued interest receivable of $7.0 million and $4.9 million at March 31, 2026 and June 30, 2025, respectively, which is included in accrued interest receivable in the consolidated statements of financial condition.