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Fair Value of Financial Instruments - Carrying Amounts and Estimated Fair Values of Selected Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities held-to-maturity, Net Carrying Amount $ 50,509 $ 51,485
Interest rate swaps    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 22,183 7,035
Derivatives 33,426 20,396
Recurring | Collateralized Mortgage-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 906,270 911,636
Recurring | Other securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 635,153 586,269
Recurring | Level 1 | Other securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 12,502 11,890
Recurring | Level 2 | Collateralized Mortgage-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 906,270 911,636
Recurring | Level 2 | Other securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 603,882 554,914
Recurring | Level 3 | Other securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 18,769 19,465
Reported Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and due from banks 142,929 152,574
Loans held for sale   70,098
Loans 6,670,333 6,745,848
FHLB-NY stock 18,909 38,096
Accrued interest receivable 60,044 62,036
Derivatives 40,615 54,700
Deposits 7,415,528 7,178,933
Borrowed Funds 492,457 916,054
Accrued interest payable 12,896 12,275
Derivatives 33,426 20,396
Reported Value Measurement | Collateralized Mortgage-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities held-to-maturity, Net Carrying Amount 7,821 7,836
Securities available for sale 906,270 911,636
Reported Value Measurement | Total other securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities held-to-maturity, Net Carrying Amount 42,688 43,649
Securities available for sale 635,153 586,269
Estimate of Fair Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and due from banks 142,929 152,574
Loans held for sale   70,098
Loans 6,401,375 6,506,439
FHLB-NY stock 18,909 38,096
Accrued interest receivable 60,044 62,036
Derivatives 40,615 54,700
Deposits 7,410,682 7,148,847
Borrowed Funds 465,171 887,312
Accrued interest payable 12,896 12,275
Derivatives 33,426 20,396
Estimate of Fair Value Measurement | Collateralized Mortgage-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities held-to-maturity, Net Carrying Amount 7,188 6,903
Securities available for sale 906,270 911,636
Estimate of Fair Value Measurement | Total other securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities held-to-maturity, Net Carrying Amount 39,196 37,815
Securities available for sale 635,153 586,269
Estimate of Fair Value Measurement | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and due from banks 142,929 152,574
Deposits 4,996,489 4,528,769
Estimate of Fair Value Measurement | Level 1 | Total other securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 12,502 11,890
Estimate of Fair Value Measurement | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
FHLB-NY stock 18,909 38,096
Accrued interest receivable 60,044 62,036
Derivatives 40,615 54,700
Deposits 2,414,193 2,620,078
Borrowed Funds 415,518 838,517
Accrued interest payable 12,896 12,275
Derivatives 33,426 20,396
Estimate of Fair Value Measurement | Level 2 | Collateralized Mortgage-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities held-to-maturity, Net Carrying Amount 7,188 6,903
Securities available for sale 906,270 911,636
Estimate of Fair Value Measurement | Level 2 | Total other securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 603,882 554,914
Estimate of Fair Value Measurement | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans held for sale   70,098
Loans 6,401,375 6,506,439
Borrowed Funds 49,653 48,795
Estimate of Fair Value Measurement | Level 3 | Total other securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities held-to-maturity, Net Carrying Amount 39,196 37,815
Securities available for sale $ 18,769 $ 19,465