v3.26.1
Securities - Amortized Cost and Fair Value and Allowance for Credit Loss on Securities Held-to-Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Securities [Abstract]      
Amortized cost, total securities held-to-maturity [1] $ 804,083 $ 776,695  
Unrealized gains 12,394 10,381  
Unrealized losses 39,315 48,942  
Fair value 777,162 738,134  
Allowance 530 548 $ 483
Net carrying value 803,553 776,147  
Accrued interest receivable $ 5,400 $ 4,900  
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Accrued interest receivable Accrued interest receivable  
U.S. Treasury Securities [Member]      
Securities [Abstract]      
Amortized cost, total securities held-to-maturity [1] $ 13,903 $ 15,850  
Unrealized gains 0 0  
Unrealized losses 639 868  
Fair value 13,264 14,982  
Allowance 0 0  
Net carrying value 13,903 15,850  
State and Political Subdivisions [Member]      
Securities [Abstract]      
Amortized cost, total securities held-to-maturity [1] 473,174 460,959  
Unrealized gains 11,474 8,938  
Unrealized losses 24,700 32,028  
Fair value 459,948 437,869  
Allowance 52 40  
Net carrying value 473,122 460,919  
Mortgage-backed Securities-Residential [Member]      
Securities [Abstract]      
Amortized cost, total securities held-to-maturity [1] 170,248 138,468  
Unrealized gains 752 1,388  
Unrealized losses 3,263 2,327  
Fair value 167,737 137,529  
Allowance 0 0  
Net carrying value 170,248 138,468  
Mortgage-backed Securities-Multi-family [Member]      
Securities [Abstract]      
Amortized cost, total securities held-to-maturity [1] 119,232 130,119  
Unrealized gains 0 0  
Unrealized losses 9,840 11,963  
Fair value 109,392 118,156  
Allowance 0 0  
Net carrying value 119,232 130,119  
Corporate Debt Securities [Member]      
Securities [Abstract]      
Amortized cost, total securities held-to-maturity [1] 27,500 31,270  
Unrealized gains 168 55  
Unrealized losses 873 1,756  
Fair value 26,795 29,569  
Allowance 477 507  
Net carrying value 27,023 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 $5.4 million and $4.9 million at June 30, 2026 and 2025, respectively, which is included in accrued interest receivable in the consolidated statements of financial condition.