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Securities - Summary of Held-to-Maturity and Available-for-Sale Securities Having Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	$ 2,610,084	$ 1,095,548
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	133,490	9,868
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	542,998	725,998
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	16,871	19,829
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	3,153,082	1,821,546
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	150,361	29,697
Debt Securities | U.S. Government and GSE obligations
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value		58,876
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss		136
Temporarily Impaired Available-for-Sale Securities, Total Fair Value		58,876
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss		136
Debt Securities | GSE Certificates
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	323,281	442,207
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	14,901	2,807
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value		73,568
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss		65
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	323,281	515,775
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	14,901	2,872
Debt Securities | GSE CMOs
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	918,257	522,441
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	50,422	3,949
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	918,257	522,441
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	50,422	3,949
Debt Securities | GSE Debentures
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	1,244,721
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	67,633
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	1,244,721
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	67,633
Debt Securities | Asset-backed Securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	112,149
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	405
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	179,063	363,618
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	2,962	5,703
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	291,212	363,618
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	3,367	5,703
Debt Securities | Municipal Bonds
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	8,744	8,891
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	186	90
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	8,744	8,891
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	186	90
Debt Securities | Corporate Bonds
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value		72,024
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss		2,976
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	319,590	246,528
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	5,410	3,471
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	319,590	318,552
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	5,410	6,447
Debt Securities | Capital Trust Notes
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	35,601	33,393
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	8,313	10,500
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	35,601	33,393
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	8,313	$ 10,500
Equity Securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	11,676
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	129
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	11,676
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	$ 129

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563

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