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Loans - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accrued interest on loans | $ 14,806,000 |  | $ 16,363,000 |
PPP loans included in commercial and industrial loans | 4,817,151,000 |  | 4,880,168,000 |
Loans pledged to secure advances | 2,340,000,000 |  | 2,170,000,000 |
Loans held for sale, at the lower of cost or fair value | 32,674,000 |  | 8,568,000 | $ 6,020,000
Gains on sale of second draw PPP loans | 4,125,000 | $ 1,154,000 |  |
Proceeds from sale of second draw PPP loans | 122,564,000 | $ 18,212,000 |  |
Loans 90 days or more past due and still accruing | 0 |  | 0 |
TDR loans receivable | $ 23,600,000 |  | 25,000,000.0 |
Principal and interest due | 3 months |  |  |
Reserves relating to loans included in allowance for credit losses | $ 7,000 |  | 16,000,000,000 |
Loans default payment past due period | 30 days |  |  |
Total recorded investment | $ 0 |  | 398,000 |
Allowance for credit losses resulting from defaulted loans |  |  | 3,000 |
60-89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, past due less than 90 days | 31,800,000 |  | 53,400,000 |
Pass/Pass-Watch |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
PPP loans included in commercial and industrial loans | 4,573,667,000 |  | 4,663,021,000 |
Special Mention |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
PPP loans included in commercial and industrial loans | 96,057,000 |  | 76,978,000 |
Classified |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
PPP loans included in commercial and industrial loans | 147,427,000 |  | 140,169,000 |
Payment Protection Program |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Modified under provision of CARES Act | 116,400,000 |  | 155,600,000 |
Loans Modified under provision of CARES Act, current | 116,400,000 |  | 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 | 1,700,000 |  | 1,700,000 |
Payment Protection Program | 30-59 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans previously modified under provision of CARES Act | 5,200,000 |  | 4,900,000 |
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 | 8,000,000.0 |  | 13,900,000 |
Payment Protection Program | Pass/Pass-Watch |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Modified under provision of CARES Act | 47,400,000 |  | 99,900,000 |
Payment Protection Program | Special Mention |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Modified under provision of CARES Act | 50,800,000 |  | 31,300,000 |
Payment Protection Program | Classified |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Modified under provision of CARES Act | 18,200,000 |  | 24,400,000 |
SBA Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans held for sale, at the lower of cost or fair value | 10,900,000 |  |  |
PPP Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans held for sale, at the lower of cost or fair value | 21,700,000 |  |  |
Gains on sale of second draw PPP loans | 2,500,000 |  |  |
Proceeds from sale of second draw PPP loans | 108,500,000 |  |  |
Accrued Interest | Payment Protection Program |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
PPP loans included in commercial and industrial loans | 256,500,000 |  |  |
Modified Loans | Payment Protection Program |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Modified under provision of CARES Act | 116,400,000 |  |  |
Loans | Accrued Interest |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accrued interest on loans | 13,600,000 |  | 15,200,000 |
Unpaid deferred interest receivable related to loans modified under CARES Act | 5,200,000 |  | 7,500,000 |
Unpaid deferred interest receivable related to loans modified under CARES Act, net of valuation allowance | $ 1,200,000 |  | $ 1,700,000 |

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- Definition Amount of financing receivable modified as troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554 + Details
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- Definition The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans and leases that were sold during the reporting period. This element refers to the gain (loss) and not to the cash proceeds of the sales. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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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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