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Loans Receivable - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) Property | Dec. 31, 2019 USD ($) Property
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
PPP loans included in commercial and industrial loans | $ 4,880,168,000 | $ 4,610,147,000
Accrued interest on loans | 16,363,000 | 11,742,000
Loans pledged to secure advances | 2,170,000,000 | 1,350,000,000
Loans 90 days or more past due and still accruing | $ 0 | $ 0
Number of real estate properties | Property | 4 | 2
Other real estate owned ("OREO") | $ 2,360,000 | $ 63,000
Reserves relating to loans included in allowance for credit losses | $ 16,000 | 22,700,000
Loans default payment past due period | 30 days |
Total recorded investment | $ 398,000 | 132,000
Allowance for credit losses resulting from defaulted loans | 3,000 | 0
60-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, past due less than 90 days | 53,400,000 | 60,900,000
Pass/Pass-Watch |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
PPP loans included in commercial and industrial loans | 4,663,021,000 |
Special Mention |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
PPP loans included in commercial and industrial loans | 76,978,000 |
Classified |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
PPP loans included in commercial and industrial loans | 140,169,000 |
Loans | Accrued Interest |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accrued interest on loans | 15,200,000 | $ 10,000,000.0
Unpaid deferred interest receivable related to loans modified under CARES Act | 7,500,000 |
Unpaid deferred interest receivable related to loans modified under CARES Act, net of valuation allowance | 1,700,000 |
Payment Protection Program |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
PPP loans included in commercial and industrial loans | 295,700,000 |
Loans Modified under provision of CARES Act | 155,600,000 |
Payment Protection Program | 60-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans previously modified under provision of CARES Act | 1.7 |
Payment Protection Program | 30-59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans previously modified under provision of CARES Act | 4.9 |
Payment Protection Program | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans previously modified under provision of CARES Act | 13.9 |
Payment Protection Program | Pass/Pass-Watch |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Modified under provision of CARES Act | 99,900,000 |
Payment Protection Program | Special Mention |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Modified under provision of CARES Act | 31,300,000 |
Payment Protection Program | Classified |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Modified under provision of CARES Act | 24,400,000 |
Payment Protection Program | Payment Deferral |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans deferred under provision of CARES Act | $ 1,410,000,000 |

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- Definition Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5086-111524 + Details
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