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Fair Value Measurements - Book Value and Estimated Fair Value of Bank's Significant Financial Instruments Not Recorded at Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financial Assets: |  |
Debt securities held-to-maturity | $ 1,099,745 | $ 968,466
Restricted equity investments | 52,199 | 51,705
Financial Liabilities: |  |
Time deposits | 1,110,758 | 1,372,783
Securities sold under agreements to repurchase with retail customers | 134,465 | 128,454
Book Value |  |
Financial Assets: |  |
Cash and due from banks | 1,173,665 | 1,272,134
Debt securities held-to-maturity | 1,082,326 | 937,253
Restricted equity investments | 52,199 | 51,705
Loans receivable, net and loans held-for-sale | 7,863,765 | 7,750,381
Financial Liabilities: |  |
Deposits other than time deposits | 8,392,054 | 8,054,833
Time deposits | 1,110,758 | 1,372,783
Other borrowings | 228,176 | 235,471
Securities sold under agreements to repurchase with retail customers | 134,465 | 128,454
Level 1 Inputs |  |
Financial Assets: |  |
Cash and due from banks | 1,173,665 | 1,272,134
Debt securities held-to-maturity | 0 | 0
Restricted equity investments | 0 | 0
Loans receivable, net and loans held-for-sale | 0 | 0
Financial Liabilities: |  |
Deposits other than time deposits | 0 | 0
Time deposits | 0 | 0
Other borrowings | 0 | 0
Securities sold under agreements to repurchase with retail customers | 134,465 | 128,454
Level 2 Inputs |  |
Financial Assets: |  |
Cash and due from banks | 0 | 0
Debt securities held-to-maturity | 1,081,590 | 952,365
Restricted equity investments | 0 | 0
Loans receivable, net and loans held-for-sale | 0 | 0
Financial Liabilities: |  |
Deposits other than time deposits | 8,392,054 | 8,054,833
Time deposits | 1,118,867 | 1,383,173
Other borrowings | 241,122 | 251,798
Securities sold under agreements to repurchase with retail customers | 0 | 0
Level 3 Inputs |  |
Financial Assets: |  |
Cash and due from banks | 0 | 0
Debt securities held-to-maturity | 18,155 | 16,101
Restricted equity investments | 52,199 | 51,705
Loans receivable, net and loans held-for-sale | 7,822,353 | 7,806,743
Financial Liabilities: |  |
Deposits other than time deposits | 0 | 0
Time deposits | 0 | 0
Other borrowings | 0 | 0
Securities sold under agreements to repurchase with retail customers | $ 0 | $ 0

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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 Fair value portion of borrowing from Federal Home Loan Bank (FHLBank). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(3)(a)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + 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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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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- Definition Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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