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Fair Value of Financial Instruments - Carrying Amounts and Estimated Fair Values of Selected Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Securities held-to-maturity, amortized cost | $ 58,888 | $ 32,018
Securities available for sale, fair value | 772,500 | 822,655
Interest Rate Swap [Member] |  |
Interest Rate Swaps, Net Amount | 2,352 | 1,001
Interest rate swaps | 388 | 2,239
Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, amortized cost | 7,934 | 7,953
Securities available for sale, fair value | 523,849 | 557,953
Other Debt Obligations [Member] |  |
Securities held-to-maturity, amortized cost | 50,954 | 24,065
Securities available for sale, fair value | 248,651 | 264,702
Reported Value Measurement [Member] |  |
Cash and due from banks | 49,787 | 118,561
Loans | 5,772,206 | 5,551,484
FHLB-NY stock | 56,921 | 57,282
Accrued interest receivable | 25,722 | 25,485
Deposits | 5,066,424 | 4,960,784
Borrowings | 1,237,231 | 1,250,843
Accrued interest payable | 6,752 | 5,890
Reported Value Measurement [Member] | Interest Rate Swap [Member] |  |
Interest Rate Swaps, Net Amount | 2,352 | 15,961
Interest rate swaps | 19,653 | 2,239
Reported Value Measurement [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, amortized cost | 7,934 | 7,953
Securities available for sale, fair value | 523,849 | 557,953
Reported Value Measurement [Member] | Other Debt Obligations [Member] |  |
Securities held-to-maturity, amortized cost | 50,954 | 24,065
Securities available for sale, fair value | 248,651 | 264,702
Estimate of Fair Value Measurement [Member] |  |
Cash and due from banks | 49,787 | 118,561
Loans | 5,822,124 | 5,496,266
FHLB-NY stock | 56,921 | 57,282
Accrued interest receivable | 25,722 | 25,485
Deposits | 5,070,046 | 4,955,077
Borrowings | 1,389,883 | 1,241,745
Accrued interest payable | 6,752 | 5,890
Estimate of Fair Value Measurement [Member] | Interest Rate Swap [Member] |  |
Interest Rate Swaps, Net Amount | 2,352 | 15,961
Interest rate swaps | 19,653 | 2,239
Estimate of Fair Value Measurement [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, amortized cost | 8,114 | 7,366
Securities available for sale, fair value | 523,849 | 557,953
Estimate of Fair Value Measurement [Member] | Other Debt Obligations [Member] |  |
Securities held-to-maturity, amortized cost | 53,998 | 22,508
Securities available for sale, fair value | 248,651 | 264,702
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash and due from banks | 49,787 | 118,561
Loans | 0 | 0
FHLB-NY stock | 0 | 0
Accrued interest receivable | 9 | 54
Deposits | 3,628,534 | 3,397,474
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 | 12,216 | 11,586
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 | 56,921 | 57,282
Accrued interest receivable | 2,519 | 2,756
Deposits | 1,441,512 | 1,557,603
Borrowings | 1,345,499 | 1,199,896
Accrued interest payable | 6,752 | 5,890
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |
Interest Rate Swaps, Net Amount | 2,352 | 15,961
Interest rate swaps | 19,653 | 2,239
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, amortized cost | 8,114 | 7,366
Securities available for sale, fair value | 523,849 | 557,953
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 | 235,103 | 251,860
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Cash and due from banks | 0 | 0
Loans | 5,822,124 | 5,496,266
FHLB-NY stock | 0 | 0
Accrued interest receivable | 23,194 | 22,675
Deposits | 0 | 0
Borrowings | 44,384 | 41,849
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 | 53,998 | 22,508
Securities available for sale, fair value | $ 1,332 | $ 1,256

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