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Loans and Leases Receivable and Allowance for Loan and Lease Losses - Narrative (Detail) | 12 Months Ended
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Dec. 31, 2019 USD ($) Loan Commitment Allowance | Dec. 31, 2018 USD ($) Loan Commitment | Dec. 31, 2017 USD ($) Commitment Loan Allowance
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans held for sale, average life from purchase to sale (days) | 30 days |  |
Troubled debt restructurings loans | $ 13,300,000 | $ 19,200,000 | $ 20,400,000
Minimum performance requirement (months) | 6 months |  |
Sustained performance period (months) | 6 months |  |
Lease receivables restructured as a TDR | $ 0 | $ 0 | $ 0
Number of loans | Loan | 28 | 41 | 40
Commitments to lend additional funds to debtors | Commitment | 0 | 0 | 0
Number of TDR loans that defaulted on payments | Loan | 4 | 4 | 5
Amount of TDR loans that defaulted on payments | $ 154,000 | $ 92,000 | $ 211,000
Allowance for TDR modification | $ 17,000 |  | $ 1,000
TDR modification (allowance) | Allowance | 15 |  | 1
Troubled Debt Restructurings |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Sustained performance period (months) | 9 months |  |
Residential Real Estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Other real estate owned | $ 200,000 | 200,000 |
Foreclosure loans | 900,000 | $ 2,100,000 |
Commercial and industrial (including owner occupied commercial real estate) |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of TDR loans that defaulted on payments | Loan |  | 1 | 1
Amount of TDR loans that defaulted on payments |  | $ 1,500,000 | $ 2,100,000
Federal Home Loan Bank of Pittsburgh |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans pledged as collateral | $ 4,600,000,000 | $ 5,400,000,000 |
Principal Forgiveness |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loans | Loan | 0 | 0 | 0

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