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Loans Receivable and Allowance for Loan Losses - Narrative (Detail) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) Commitment Loan | Jul. 11, 2016 USD ($) | Mar. 31, 2014 Allowance | Dec. 31, 2018 USD ($) Allowance Commitment Loan | Dec. 31, 2017 USD ($) Allowance Commitment Loan | Dec. 31, 2016 USD ($) Allowance Commitment Loan
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |
Loans held for sale, average life from purchase to sale (days) |  |  |  | 23 days |  |
Loans receivable, net of allowance for loan losses, carrying value | $ 8,503,522,000 |  |  | $ 8,503,522,000 | $ 8,523,651,000 |
Available funds for reimbursement | 500,000 |  |  | 500,000 | 600,000 |
Individually evaluated for impairment | 39,118,000 |  |  | 39,118,000 | 38,435,000 |
Troubled debt restructurings loans | $ 19,200,000 |  |  | $ 19,200,000 | $ 20,400,000 | $ 16,400,000
Minimum performance requirement (months) |  |  |  | 6 months |  |
Sustained performance period (months) |  |  |  | 6 months |  |
Commitments to lend additional funds to debtors | Commitment | 0 |  |  | 0 | 0 | 0
Number of Loans | Loan |  |  |  | 41 | 40 | 64
TDR modification (allowance) | Allowance |  |  | 0 | 0 | 1 | 0
Allowance for TDR modification |  |  |  |  | $ 1,000 |
Threshold period to pay potential liability related to FDIC loss sharing agreements |  |  |  | 45 days |  |
Payments for termination to FDIC |  | $ 1,400,000 |  |  |  |
Loans held-for-investment, purchase price as a percentage of loans outstanding |  |  |  | 99.90% | 99.40% |
Payments to acquire loans receivable |  |  |  | $ 398,468,000 | $ 264,090,000 | $ 0
Gain (loss) on sales of loans |  |  |  | 3,294,000 | 4,223,000 | $ 3,685,000
Commercial and industrial |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | $ 17,828,000 |  |  | 17,828,000 | 17,461,000 |
Other |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 111,000 |  |  | $ 111,000 | $ 30,000 |
Number of Loans | Loan |  |  |  | 1 | 0 | 0
Manufactured housing |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 10,195,000 |  |  | $ 10,195,000 | $ 10,089,000 |
Number of Loans | Loan |  |  |  | 38 | 36 | 58
Number of TDR loans that defaulted on payments | Loan |  |  |  |  | 5 | 8
Amount of TDR loans that defaulted on payments |  |  |  |  | $ 200,000 | $ 200,000
Commercial real estate non-owner occupied |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 129,000 |  |  | $ 129,000 | $ 160,000 |
Number of Loans | Loan |  |  |  | 0 | 0 | 1
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] |  |  |  |  |  |
Individually evaluated for impairment | 8,631,000 |  |  | $ 8,631,000 | $ 9,247,000 |
Number of Loans | Loan |  |  |  | 2 | 0 | 4
Number of TDR loans that defaulted on payments | Loan |  |  |  |  |  | 1
Amount of TDR loans that defaulted on payments |  |  |  |  |  | $ 100,000
Multi-family |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 1,155,000 |  |  | $ 1,155,000 | $ 0 |
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 | 200,000 |  |  | $ 200,000 | 300,000 |
Foreclosure loans | $ 2,100,000 |  |  | $ 2,100,000 | 1,600,000 |
Commercial and industrial (including owner occupied commercial real estate) |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |
Number of TDR loans that defaulted on payments | Loan |  |  |  | 1 |  |
Amount of TDR loans that defaulted on payments |  |  |  | $ 1,500,000 | 2,100,000 |
Manufactured Housing |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |
Number of TDR loans that defaulted on payments | Loan | 4 |  |  |  |  |
Amount of TDR loans that defaulted on payments | $ 100,000 |  |  |  |  |
Federal Home Loan Bank of Pittsburgh |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |
Loans pledged as collateral | $ 5,400,000,000 |  |  | $ 5,400,000,000 | $ 5,500,000,000 |
Principal Forgiveness |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |
Number of Loans | Loan |  |  |  | 0 | 0 | 0

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