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Loans Receivable and Allowance for Loan Losses - Additional Information (Detail) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) Allowance Commitment Loan | Mar. 31, 2017 USD ($) Allowance Loan | Dec. 31, 2017 USD ($) Commitment
Financing Receivable, Modifications [Line Items] |  |  |
Funds for reimbursement | $ 600,000 |  |
Loans reported as TDR | $ 19,000,000 |  | $ 20,400,000
Minimum performance requirement | 6 months |  |
Sustained performance period | 9 months |  |
Number of commitments to lend additional funds (commitment) | Commitment | 0 |  | 0
Loans modified as TDR allowance (allowance) | Allowance | 0 | 0 |
Residential mortgage loans acquired |  | $ 0 |
Loans receivable, net of allowance for loan losses | $ 6,904,067,000 |  | $ 6,730,243,000
Gain on sale of SBA and other loans | 1,361,000 | $ 1,328,000 |
Term of fixed rate residential mortgage loans |  | 30 years |
Purchase price as a percentage of loans outstanding |  | 98.50% |
Residential real estate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Residential real estate held in other real estate owned | 300,000 |  |
Loans in process of foreclosure | $ 1,200,000 |  | $ 1,600,000
Commercial and industrial |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of loans modified as TDR (loan) | Loan | 1 |  |
Loans modified as TDR | $ 2,100,000 |  |
Manufactured housing |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of loans modified as TDR (loan) | Loan | 1 | 5 |
Loans modified as TDR | $ 29,000 | $ 200,000 |
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 | 15,000,000 | 8,700,000 |
Gain on sale of SBA and other loans | 1,400,000 | 800,000 |
Residential Mortgage Loan Commitments |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Loans receivable, net of allowance for loan losses |  | 174,200,000 |
Multi-family |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Loans receivable, net of allowance for loan losses |  | 94,900,000 |
Loans receivable, net |  | 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 | $ 5,500,000,000 |  |

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- Definition The effect of a change in method or methods for calculating the allowance for credit losses on the current period provision. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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