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Loans Receivable and Allowance for Loan Losses - Additional Information (Detail) |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) Commitment Loan | Dec. 31, 2017 USD ($) Loan | Jun. 30, 2017 USD ($) Loan | Jun. 30, 2018 USD ($) Allowance Commitment Loan | Mar. 31, 2018 USD ($) | Jun. 30, 2017 USD ($) Allowance Loan | Mar. 31, 2017 USD ($) | Jun. 30, 2018 USD ($) Allowance Commitment Loan | Jun. 30, 2017 USD ($) Allowance Loan
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Loans held for sale, average life from purchase to sale |  |  |  |  |  |  |  | 20 days |
Funds for reimbursement | $ 500,000 | $ 600,000 |  | $ 500,000 |  |  |  | $ 500,000 |
Loans reported as TDR | $ 19,400,000 | 20,400,000 |  | $ 19,400,000 |  |  |  | $ 19,400,000 |
Minimum performance requirement |  |  |  |  |  |  |  | 6 months |
Sustained performance period |  |  |  |  |  |  |  | 9 months |
Number of Loans | Loan |  |  |  | 16 |  | 11 |  | 25 | 32
Number of commitments to lend additional funds (commitment) | Commitment | 0 |  |  | 0 |  |  |  | 0 |
Loans modified as TDR allowance (allowance) | Allowance |  |  |  | 0 |  | 0 |  |  | 0
Residential mortgage loans acquired |  |  |  |  |  |  |  |  | $ 0
Loans receivable, net of allowance for loan losses | $ 9,074,176,000 | 8,523,651,000 |  | $ 9,074,176,000 |  |  |  | $ 9,074,176,000 |
Proceeds from sales of loans |  |  |  |  |  |  |  | 29,038,000 | 112,927,000
Gain on sale of SBA and other loans |  |  |  | $ 947,000 |  | $ 573,000 |  | 2,308,000 | 1,901,000
Term of fixed rate residential mortgage loans |  |  |  | 30 years |  | 30 years | 30 years |  |
Purchase price as a percentage of loans outstanding |  |  |  | 100.40% |  | 101.00% | 98.50% |  |
Residential real estate |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Residential real estate held in other real estate owned | 300,000 |  |  | $ 300,000 |  |  |  | 300,000 |
Loans in process of foreclosure | 2,200,000 | $ 1,600,000 |  | 2,200,000 |  |  |  | 2,200,000 |
Loans receivable, net of allowance for loan losses | $ 277,400,000 |  |  | 277,400,000 |  |  |  | $ 277,400,000 |
Commercial and industrial |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Number of loans modified as TDR (loan) | Loan | 1 | 1 |  |  |  |  |  |  |
Loans modified as TDR | $ 1,600,000 | $ 2,100,000 |  |  |  |  |  |  |
Manufactured housing |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Number of loans modified as TDR (loan) | Loan | 0 |  | 6 |  |  |  |  |  |
Loans modified as TDR |  |  |  |  |  |  |  |  | 300,000
Loans modified as TDR allowance (allowance) | Allowance |  |  |  |  |  |  |  | 1 |
Allowance for credit losses, effect of change in method |  |  |  |  |  |  |  | $ 1,000 |
Small Business Administration Loan |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable, net of allowance for loan losses | $ 11,700,000 |  | $ 7,000,000 | 11,700,000 | $ 15,000,000 | $ 7,000,000 | $ 8,700,000 | 11,700,000 | 7,000,000
Gain on sale of SBA and other loans |  |  |  | 900,000 | $ 1,400,000 | 600,000 | 800,000 |  |
Residential Mortgage Loan Commitments |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable, net of allowance for loan losses |  |  | $ 90,000,000 |  |  | $ 90,000,000 | 174,200,000 |  | $ 90,000,000
Multi-family |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable, net of allowance for loan losses |  |  |  |  |  |  | 94,900,000 |  |
Proceeds from sales of loans |  |  |  |  |  |  | 95,400,000 |  |
Gain on sale of SBA and other loans |  |  |  |  |  |  | $ 500,000 |  |
Federal Home Loan Bank of Pittsburgh |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Loans pledged as collateral | $ 5,600,000,000 | $ 5,500,000,000 |  | $ 5,600,000,000 |  |  |  | $ 5,600,000,000 |
Principal Forgiveness |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [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=84173941&loc=d3e5086-111524 + Details
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