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Loans and Leases Receivable and Allowance for Loan and Lease Losses - Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 USD ($) Loan | Sep. 30, 2019 USD ($) Commitment Loan | Sep. 30, 2018 USD ($) Loan Allowance | Sep. 30, 2019 USD ($) Commitment Loan | Sep. 30, 2018 USD ($) Loan Allowance
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Loans held for sale, average life from purchase to sale |  |  |  | 30 days |
Loans reported as TDR | $ 19,200,000 | $ 13,500,000 |  | $ 13,500,000 |
Lease receivable, TDR | 0 | $ 0 |  | $ 0 |
Minimum performance requirement |  |  |  | 9 months |
Number of loans | Loan |  | 7 | 8 | 21 | 33
Recorded investment |  | $ 196,000 | $ 473,000 | $ 1,142,000 | $ 1,458,000
Number of loans modified as TDR (loan) | Loan |  |  |  | 4 | 0
Number of commitments to lend additional funds (commitment) | Commitment |  | 0 |  | 0 |
Loans modified as TDR |  |  |  | $ 158,000 | $ 0
Loans modified as TDR allowance, amount |  | $ 3,000 |  | $ 6,000 |
Loans modified as TDR (loans) | Loan |  | 4 |  | 9 |
Loans modified as TDR allowance (allowance) | Allowance |  |  | 0 |  | 0
Loans and leases receivable, net of allowance for loan and lease losses | 8,503,522,000 | $ 9,723,714,000 |  | $ 9,723,714,000 |
Loans pledged as collateral | 5,400,000,000 | 5,200,000,000 |  | 5,200,000,000 |
Residential real estate |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Residential real estate held in other real estate owned | 200,000 | 200,000 |  | 200,000 |
Loans in process of foreclosure | $ 2,100,000 | $ 800,000 |  | $ 800,000 |
Commercial and industrial |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans modified as TDR (loan) | Loan | 1 |  |  |  |
Loans modified as TDR | $ 1,500,000 |  |  |  |
Forgiveness of debt |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans | Loan |  | 0 | 0 | 0 | 0

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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=118936363&loc=d3e5086-111524 + Details
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