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Loans and Leases - Additional Information (Detail) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 USD ($) SecurityLoan | Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accrued interest receivable | $ 12,946,000 | $ 13,331,000
Loans and leases receivable pledged to secure advances | 1,200,000,000 | 1,100,000,000
Loans and leases 90 days or more past due and still accruing | 0 | 4,000
Commitments to lend additional funds to borrowers whose loans are impaired | 0 | 0
TDR loans receivable | $ 47,100,000 | 10,300,000
Principal and interest due | 3 months |
Reserves relating to loans included in allowance for loan losses | $ 15,900,000 | 313,000
Increase in allowance | 15,700,000 |
Loans and lease receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accrued interest receivable | 11,200,000 | $ 10,900,000
Real estate loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified within last twelve months | $ 30,300,000 |
Number of loans modified within last twelve months | SecurityLoan | 7 |
Commercial and industrial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified within last twelve months | $ 12,700,000 |
Number of loans modified within last twelve months | SecurityLoan | 1 |

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