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Loans Receivable and Allowance for Loan Losses - Narrative (Detail) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 11, 2016 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Sep. 30, 2016 USD ($) | Mar. 31, 2014 Allowance | Dec. 31, 2017 USD ($) Allowance Commitment Loan | Dec. 31, 2016 USD ($) Allowance Commitment Loan | Dec. 31, 2015 USD ($) Commitment Loan
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |
Loans receivable, net of allowance for loan losses, carrying value |  |  |  |  |  | $ 6,730,243,000 | $ 6,117,322,000 |
Available funds for reimbursement |  |  |  |  |  | 600,000 | 1,000,000 |
Individually evaluated for impairment |  |  |  |  |  | 38,435,000 | 29,411,000 |
Troubled debt restructurings loans |  |  |  |  |  | $ 20,400,000 | $ 16,400,000 | $ 11,400,000
Minimum performance requirement (months) |  |  |  |  |  | 6 months |  |
Sustained performance period (months) |  |  |  |  |  | 6 months |  |
Commitments to lend additional funds to debtors | Commitment |  |  |  |  |  | 0 | 0 | 0
Number of TDR loans that defaulted on payments | Loan |  |  |  |  |  |  |  | 11
TDR modification (allowance) | Allowance |  |  |  |  | 0 | 3 |  |
Payments for termination to FDIC | $ 1,400,000 |  |  |  |  |  |  |
Mortgage loans on real estate, loans acquired |  | $ 90,000,000 | $ 174,200,000 | $ 0 |  |  |  |
Loans held-for-investment, term |  |  | 30 years |  |  |  |  |
Loans held-for-investment, purchase price as a percentage of loans outstanding |  | 101.00% | 98.50% |  |  |  |  |
Gain (loss) on sales of loans |  |  |  |  |  | $ 4,223,000 | $ 3,685,000 | $ 4,047,000
Commercial and industrial (including owner occupied commercial real estate) |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |
TDR modification (allowance) | Allowance |  |  |  |  |  |  | 2 |
Allowance for TDR modification |  |  |  |  |  |  | $ 200,000 |
Commercial real estate non-owner occupied |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |
TDR modification (allowance) | Allowance |  |  |  |  |  |  | 1 |
Allowance for TDR modification |  |  |  |  |  |  | $ 100,000 |
Commercial and industrial |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  | 17,461,000 | 8,516,000 |
Other |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  | 30,000 | 57,000 |
Manufactured housing |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  | $ 10,089,000 | $ 9,665,000 |
Number of TDR loans that defaulted on payments | Loan |  |  |  |  |  | 5 | 8 |
Amount of TDR loans that defaulted on payments |  |  |  |  |  | $ 200,000 | $ 200,000 | $ 300,000
Commercial real estate - non-owner occupied |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  | 160,000 | $ 2,151,000 |
Number of TDR loans that defaulted on payments | Loan |  |  |  |  |  |  | 1 |
Amount of TDR loans that defaulted on payments |  |  |  |  |  |  | $ 1,800,000 |
Residential real estate |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |
Loans receivable, net of allowance for loan losses, carrying value |  |  |  |  |  | 191,600,000 |  |
Individually evaluated for impairment |  |  |  |  |  | 9,247,000 | $ 6,972,000 |
Number of TDR loans that defaulted on payments | Loan |  |  |  |  |  |  | 1 |
Amount of TDR loans that defaulted on payments |  |  |  |  |  |  | $ 100,000 |
Gain (loss) on sales of loans |  |  |  |  |  | 200,000 |  |
Multi-family |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |
Loans receivable, net of allowance for loan losses, carrying value |  |  |  |  |  | 226,900,000 |  |
Individually evaluated for impairment |  |  |  |  |  | 0 | 0 |
Gain (loss) on sales of loans |  |  |  |  |  | $ 400,000 |  |
Commercial |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on sales of loans |  |  |  |  |  |  | 100,000 |
Troubled Debt Restructurings |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |
Sustained performance period (months) |  |  |  |  |  | 9 months |  |
Residential Real Estate |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |
Other real estate owned |  |  |  |  |  | $ 300,000 | 500,000 |
Foreclosure loans |  |  |  |  |  | 1,600,000 | 400,000 |
Commercial and industrial (including owner occupied commercial real estate) |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |
Loans receivable, net of allowance for loan losses, carrying value |  |  |  |  |  | $ 3,900,000 |  |
Number of TDR loans that defaulted on payments | Loan |  |  |  |  |  | 1 |  |
Amount of TDR loans that defaulted on payments |  |  |  |  |  | $ 2,100,000 |  |
Gain (loss) on sales of loans |  |  |  |  |  | $ 100,000 |  |
Number of loans | Loan |  |  |  |  |  | 1 |  |
Small Business Administration Loan |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |
Loans receivable, net of allowance for loan losses, carrying value |  |  |  |  |  | $ 35,800,000 | 33,300,000 |
Gain (loss) on sales of loans |  |  |  |  |  | $ 3,500,000 | 3,700,000 |
Manufactured Housing |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |
TDR modification (allowance) | Allowance |  |  |  |  |  | 1 |  |
Allowance for TDR modification |  |  |  |  |  | $ 1,000 |  |
Commercial |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |
Loans receivable, net of allowance for loan losses, carrying value |  |  |  |  |  |  | 5,700,000 |
Federal Home Loan Bank of Pittsburgh |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |
Loans pledged as collateral |  |  |  |  |  | $ 5,500,000,000 | 4,800,000,000 |
Held and Used | Commercial and industrial |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |
Loans receivable, net of allowance for loan losses, carrying value |  |  |  |  |  |  | 11,500,000 |
Held and Used | Other |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |
Loans receivable, net of allowance for loan losses, carrying value |  |  |  |  |  |  | $ 700,000 |

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