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Securities - Summary of Held-to-Maturity and Available-for-Sale Securities Having Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	$ 589,073	$ 1,671,447
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	10,340	21,770
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	884,962	627,545
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	39,653	11,637
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	1,474,035	2,298,992
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	49,993	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	9,997	11,917
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	3
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	9,997	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	13,142	396,930
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	35	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	13,142	404,472
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	35	3,763
Debt Securities | GSE CMOs
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	24,532	609,502
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	28	2,582
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	240,311	133,955
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	820	959
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	264,843	743,457
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	848	3,541
Debt Securities | Asset-backed Securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value		256,619
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss		10,854
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	361,265	116,635
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	18,962
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	361,265	373,254
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	18,962	10,854
Debt Securities | Municipal Bonds
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	9,215	9,349
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	185	475
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	9,215	9,349
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	185	475
Debt Securities | Corporate Bonds
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	483,178	99,300
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	6,274	700
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	241,190	172,717
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	8,810	2,283
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	724,368	272,017
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	15,084	2,983
Debt Securities | Capital Trust Notes
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	43,034
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	3,897
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	32,981	37,525
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	10,876	6,306
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	76,015	37,525
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	14,773	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	15,190
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	103
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	15,190	11,633
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	$ 103	$ 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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