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Loans Receivable and Allowance for Loan Losses - Additional Information (Detail) |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) Loan Commitment | Dec. 31, 2017 USD ($) Loan | Jun. 30, 2017 USD ($) Loan | Jun. 30, 2018 USD ($) Allowance Commitment | Mar. 31, 2018 USD ($) | Jun. 30, 2017 USD ($) Allowance | Mar. 31, 2017 USD ($) | Jun. 30, 2018 USD ($) Allowance Commitment | Jun. 30, 2017 USD ($) Allowance
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
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 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 | $ 7,143,438,000 | 6,730,243,000 |  | $ 7,143,438,000 |  |  |  | $ 7,143,438,000 |
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 |

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- Definition The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 + 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=84173941&loc=d3e5086-111524 + Details
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