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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Financial Assets: |  |  |  |  |  |
Cash and cash equivalents, Carrying Value |  | $ 2,722,915 | $ 1,947,931 | $ 741,870 | $ 1,474,955 | $ 2,528,169
Cash and cash equivalents, Estimated Fair Value |  | 2,722,915 | 1,947,931 | 741,870 |  |
FHLB stock, Carrying Value | [1] | 698,984 | 714,005 | 647,562 |  |
FHLB stock, Estimated Fair Value | [1] | 698,984 | 714,005 | 647,562 |  |
Loans and leases, net, Carrying Value |  | 43,068,816 | 42,806,691 | 41,746,517 |  |
Loans and leases, net, Estimated Fair Value |  | 42,433,118 | 42,376,214 | 41,699,929 |  |
Financial Liabilities: |  |  |  |  |  |
Deposits, Carrying Value |  | 34,197,136 | 32,436,813 | 31,657,132 |  |
Deposits, Estimated Fair Value |  | 34,215,071 | 32,466,013 | 31,713,945 |  |
Borrowed funds, Carrying Value |  | 15,758,787 | 16,083,544 | 14,557,593 |  |
Borrowed funds, Estimated Fair Value |  | 16,475,503 | 16,794,338 | 14,882,776 |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |
Cash and cash equivalents, Carrying Value |  | 2,722,915 | 1,947,931 | 741,870 |  |
Financial Liabilities: |  |  |  |  |  |
Deposits, Carrying Value | [2] | 24,582,838 | 22,106,133 | 17,442,274 |  |
Significant Other Observable Inputs (Level 2) |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |
FHLB stock, Carrying Value | [1] | 698,984 | 714,005 | 647,562 |  |
Financial Liabilities: |  |  |  |  |  |
Deposits, Carrying Value | [3] | 9,632,233 | 10,359,880 | 14,271,671 |  |
Borrowed funds, Carrying Value |  | 16,475,503 | 16,794,338 | 14,882,776 |  |
Significant Unobservable Inputs (Level 3) |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |
Loans and leases, net, Carrying Value |  | $ 42,433,118 | $ 42,376,214 | $ 41,699,929 |  |
[1] | Carrying value and estimated fair value are at cost.
[2] | Interest-bearing checking and money market accounts, savings accounts, and non-interest-bearing accounts.
[3] | Certificates of deposit.

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809 + Details
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