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Securities - Summary of Held-to-Maturity and Available-for-Sale Securities Having Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	$ 850,664	$ 1,671,447
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	9,253	21,770
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	783,381	627,545
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	25,067	11,637
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	1,634,045	2,298,992
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	34,320	33,407
Debt Securities | U.S. Treasury Obligations
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	49,987	11,917
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	3
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	49,987	11,917
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	3
Debt Securities | GSE Certificates
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	7,415	396,930
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	25	3,718
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value		7,542
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss		45
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	7,415	404,472
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	25	3,763
Debt Securities | GSE CMOs
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	2,579	609,502
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	6	2,582
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	128,575	133,955
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	77	959
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	131,154	743,457
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	83	3,541
Debt Securities | GSE Debentures
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	507,331
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	3,640
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	507,331
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	3,640
Debt Securities | Asset-backed Securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	58,647	256,619
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	372	10,854
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	366,963	116,635
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	9,615
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	425,610	373,254
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	9,987	10,854
Debt Securities | Municipal Bonds
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	9,235	9,349
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	113	475
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	9,235	9,349
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	113	475
Debt Securities | Corporate Bonds
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	163,643	99,300
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	3,962	700
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	245,201	172,717
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	4,799	2,283
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	408,844	272,017
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	8,761	2,983
Debt Securities | Capital Trust Notes
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	45,770
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	1,244
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	33,407	37,525
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	10,463	6,306
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	79,177	37,525
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	11,707	6,306
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		297,179
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss		3,916
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value		138,189
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss		1,396
Temporarily Impaired Available-for-Sale Securities, Total Fair Value		435,368
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss		5,312
Equity Securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	15,292
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	1
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value		11,633
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss		173
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	15,292	11,633
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	$ 1	$ 173

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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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