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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, 2021 | Dec. 31, 2020
--- | --- | ---
Securities held-to-maturity, amortized cost | $ 57,888 | $ 57,832
Securities available for sale, fair value | 796,799 | 647,974
Interest Rate Swap [Member] |  |
Interest Rate Swaps, Net Amount | 7,393 | 1,319
Interest rate swaps | 4,129 | (2,629)
Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, amortized cost | 7,899 | 7,914
Securities available for sale, fair value | 584,145 | 404,460
Other Debt Obligations [Member] |  |
Securities held-to-maturity, amortized cost | 49,989 | 49,918
Securities available for sale, fair value | 212,654 | 243,514
Reported Value Measurement [Member] |  |
Cash and due from banks | 178,598 | 157,388
Loans | 6,630,354 | 6,704,674
FHLB-NY stock | 36,158 | 43,439
Accrued interest receivable | 40,912 | 44,041
Deposits | 6,488,598 | 6,136,355
Borrowings | 752,925 | 1,020,895
Accrued interest payable | 5,698 | 4,755
Reported Value Measurement [Member] | Interest Rate Swap [Member] |  |
Interest Rate Swaps, Net Amount | 7,393 | 1,319
Interest rate swaps | 33,196 | 60,987
Reported Value Measurement [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, amortized cost | 7,899 | 7,914
Securities available for sale, fair value | 584,145 | 404,460
Reported Value Measurement [Member] | Other Debt Obligations [Member] |  |
Securities held-to-maturity, amortized cost | 50,832 | 50,825
Securities available for sale, fair value | 212,654 | 243,514
Estimate of Fair Value Measurement [Member] |  |
Cash and due from banks | 178,598 | 157,388
Loans | 6,722,201 | 6,793,985
FHLB-NY stock | 36,158 | 43,439
Accrued interest receivable | 40,912 | 44,041
Deposits | 6,491,487 | 6,141,775
Borrowings | 753,952 | 1,017,573
Accrued interest payable | 5,698 | 4,755
Estimate of Fair Value Measurement [Member] | Interest Rate Swap [Member] |  |
Interest Rate Swaps, Net Amount | 7,393 | 1,319
Interest rate swaps | 33,196 | 60,987
Estimate of Fair Value Measurement [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, amortized cost | 8,698 | 8,991
Securities available for sale, fair value | 584,145 | 404,460
Estimate of Fair Value Measurement [Member] | Other Debt Obligations [Member] |  |
Securities held-to-maturity, amortized cost | 52,753 | 54,538
Securities available for sale, fair value | 212,654 | 243,514
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash and due from banks | 178,598 | 157,388
Loans | 0 | 0
FHLB-NY stock | 0 | 0
Accrued interest receivable | 2 | 2
Deposits | 5,448,500 | 4,997,994
Borrowings | 0 | 0
Accrued interest payable | 0 | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member] |  |
Interest Rate Swaps, Net Amount | 0 | 0
Interest rate swaps | 0 | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, amortized cost | 0 | 0
Securities available for sale, fair value | 0 | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Other Debt Obligations [Member] |  |
Securities held-to-maturity, amortized cost | 0 | 0
Securities available for sale, fair value | 12,572 | 12,703
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cash and due from banks | 0 | 0
Loans | 0 | 0
FHLB-NY stock | 36,158 | 43,439
Accrued interest receivable | 1,591 | 1,389
Deposits | 1,042,987 | 1,143,781
Borrowings | 702,374 | 974,437
Accrued interest payable | 5,698 | 4,755
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |
Interest Rate Swaps, Net Amount | 7,393 | 1,319
Interest rate swaps | 33,196 | 60,987
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, amortized cost | 8,698 | 8,991
Securities available for sale, fair value | 584,145 | 404,460
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Other Debt Obligations [Member] |  |
Securities held-to-maturity, amortized cost | 0 | 0
Securities available for sale, fair value | 198,534 | 229,516
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Cash and due from banks | 0 | 0
Loans | 6,722,201 | 6,793,985
FHLB-NY stock | 0 | 0
Accrued interest receivable | 39,319 | 42,650
Deposits | 0 | 0
Borrowings | 51,578 | 43,136
Accrued interest payable | 0 | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member] |  |
Interest Rate Swaps, Net Amount | 0 | 0
Interest rate swaps | 0 | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, amortized cost | 0 | 0
Securities available for sale, fair value | 0 | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Other Debt Obligations [Member] |  |
Securities held-to-maturity, amortized cost | 52,753 | 54,538
Securities available for sale, fair value | $ 1,548 | $ 1,295

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