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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, 2024 | Dec. 31, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity | $ 71,700 | $ 72,923
Securities available for sale | 1,677,854 | 954,164
Interest Rate Swap [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps | 27,488 | 20,508
Interest rate swaps | 37,710 | 28,401
Reported Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and due from banks | 267,643 | 172,157
Loans | 6,818,328 | 6,906,950
FHLB-NY stock | 32,745 | 31,066
Accrued interest receivable | 64,369 | 59,018
Deposits | 7,572,395 | 6,815,261
Borrowed Funds | 846,123 | 841,281
Accrued interest payable | 16,805 | 12,111
Reported Value Measurement [Member] | Interest Rate Swap [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps | 50,303 | 69,013
Interest rate swaps |  | 28,401
Reported Value Measurement [Member] | Collateralized Mortgage Backed Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity | 7,841 | 7,855
Securities available for sale | 926,731 | 354,344
Reported Value Measurement [Member] | Total Other Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity | 64,945 | 66,155
Securities available for sale | 687,518 | 520,409
Estimate of Fair Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and due from banks | 267,643 | 172,157
Loans | 6,416,360 | 6,512,841
FHLB-NY stock | 32,745 | 31,066
Accrued interest receivable | 64,369 | 59,018
Deposits | 7,553,063 | 6,778,657
Borrowed Funds | 821,396 | 801,156
Accrued interest payable | 16,805 | 12,111
Estimate of Fair Value Measurement [Member] | Interest Rate Swap [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps | 50,303 | 69,013
Interest rate swaps | 37,710 | 28,401
Estimate of Fair Value Measurement [Member] | Collateralized Mortgage Backed Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity | 7,243 | 7,058
Securities available for sale | 926,731 | 354,344
Estimate of Fair Value Measurement [Member] | Total Other Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity | 56,709 | 58,697
Securities available for sale | 687,518 | 520,409
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and due from banks | 267,643 | 172,157
Deposits | 4,696,909 | 4,503,971
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Total Other Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 12,168 | 11,660
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
FHLB-NY stock | 32,745 | 31,066
Accrued interest receivable | 64,369 | 59,018
Deposits | 2,856,154 | 2,274,686
Borrowed Funds | 773,473 | 753,306
Accrued interest payable | 16,805 | 12,111
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps | 50,303 | 69,013
Interest rate swaps | 37,710 | 28,401
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity | 7,243 | 7,058
Securities available for sale | 926,731 | 354,344
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Total Other Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 673,911 | 507,312
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans | 6,416,360 | 6,512,841
Borrowed Funds | 47,923 | 47,850
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Total Other Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity | 56,709 | 58,697
Securities available for sale | $ 1,439 | $ 1,437

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