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Fair Value of Financial Instruments - Carrying Amounts and Estimated Fair Values of Selected Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Securities held-to-maturity, amortized cost | $ 58,556 | $ 58,888
Securities available for sale, fair value | 715,412 | 772,500
Interest Rate Swap [Member] |  |
Interest Rate Swaps, Net Amount |  | 2,352
Interest rate swaps | (1,915) | 388
Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, amortized cost | 7,929 | 7,934
Securities available for sale, fair value | 489,556 | 523,849
Other Debt Obligations [Member] |  |
Securities held-to-maturity, amortized cost | 50,627 | 50,954
Securities available for sale, fair value | 225,856 | 248,651
Reported Value Measurement [Member] |  |
Cash and due from banks | 157,184 | 49,787
Loans | 5,932,088 | 5,772,206
FHLB-NY stock | 74,000 | 56,921
Accrued interest receivable | 25,526 | 25,722
Deposits | 4,901,486 | 5,066,424
Borrowings | 1,617,582 | 1,237,231
Accrued interest payable | 7,492 | 6,752
Reported Value Measurement [Member] | Interest Rate Swap [Member] |  |
Interest Rate Swaps, Net Amount |  | 2,352
Interest rate swaps | 70,611 | 19,653
Reported Value Measurement [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, amortized cost | 7,929 | 7,934
Securities available for sale, fair value | 489,556 | 523,849
Reported Value Measurement [Member] | Other Debt Obligations [Member] |  |
Securities held-to-maturity, amortized cost | 50,225 | 50,954
Securities available for sale, fair value | 225,856 | 248,651
Estimate of Fair Value Measurement [Member] |  |
Cash and due from banks | 157,184 | 49,787
Loans | 6,035,453 | 5,822,124
FHLB-NY stock | 74,000 | 56,921
Accrued interest receivable | 25,527 | 25,722
Deposits | 4,914,041 | 5,070,046
Borrowings | 1,624,010 | 1,389,883
Accrued interest payable | 7,492 | 6,752
Estimate of Fair Value Measurement [Member] | Interest Rate Swap [Member] |  |
Interest Rate Swaps, Net Amount |  | 2,352
Interest rate swaps | 70,611 | 19,653
Estimate of Fair Value Measurement [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, amortized cost | 8,953 | 8,114
Securities available for sale, fair value | 489,556 | 523,849
Estimate of Fair Value Measurement [Member] | Other Debt Obligations [Member] |  |
Securities held-to-maturity, amortized cost | 51,938 | 53,998
Securities available for sale, fair value | 225,856 | 248,651
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash and due from banks | 157,184 | 49,787
Loans | 0 | 0
FHLB-NY stock | 0 | 0
Accrued interest receivable | 2 | 9
Deposits | 3,729,105 | 3,628,534
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
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 | 12,476 | 12,216
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 | 74,000 | 56,921
Accrued interest receivable | 2,254 | 2,519
Deposits | 1,184,936 | 1,441,512
Borrowings | 1,578,884 | 1,345,499
Accrued interest payable | 7,492 | 6,752
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |
Interest Rate Swaps, Net Amount |  | 2,352
Interest rate swaps | 70,611 | 19,653
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, amortized cost | 8,953 | 8,114
Securities available for sale, fair value | 489,556 | 523,849
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 | 212,025 | 235,103
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Cash and due from banks | 0 | 0
Loans | 6,035,453 | 5,822,124
FHLB-NY stock | 0 | 0
Accrued interest receivable | 23,271 | 23,194
Deposits | 0 | 0
Borrowings | 45,126 | 44,384
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
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 | 51,938 | 53,998
Securities available for sale, fair value | $ 1,355 | $ 1,332

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