v3.25.2
Fair Value (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Sep. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Mortgage loans held for sale $ 31,010   $ 31,010   $ 17,986
Net gain on the sale of loans 726 $ 723 3,028 $ 1,646  
Investment securities, available for sale 525,212   525,212   526,251
Real estate owned 1,240   1,240   174
Cost to dispose related to properties measured at fair value included in Consolidated Statements of Condition 330   $ 330   46
Derivatives, Determination of Fair Value     Derivatives qualifying as cash flow hedges are settled daily    
Loans, net 15,595,997   $ 15,595,997   15,322,059
Interest Rate Swap | Cash Flow Hedge | Designated as Hedging Instrument          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair Value 0   0    
Subject To Pending Agency Contracts          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Mortgage loans held for sale 29,303   29,303   10,713
Net gain on the sale of loans 289 $ 94 22 $ 162  
Unpaid principal balance 28,734   28,734   10,336
Fair Value, Inputs, Level 2          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Mortgage loans held for sale 31,010   31,010   17,986
Investment securities, available for sale 525,212   525,212   526,251
Fair Value, Inputs, Level 2 | Valuation, Cost Approach          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Mortgage loans held for sale 1,675   1,675   7,061
Fair Value, Inputs, Level 3          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Mortgage loans held for sale 0   0   0
Investment securities, available for sale 0   0   0
Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Mortgage loans held for sale 29,303   29,303   10,713
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Mortgage loans held for sale 29,303   29,303   10,713
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Market Approach Valuation Technique | U.S. Government Obligations          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Investment securities, available for sale 525,212   525,212   526,251
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Mortgage loans held for sale 0   0   0
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3 | Cost Basis          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Real estate owned 1,570   1,570   220
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3 | Carried At Original Or Adjusted Cost Basis          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Real estate owned $ 0   $ 0   $ 0