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Loans and Leases - Additional Information (Detail) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total gross loans and leases receivable | $ 4,582,883,000 | $ 4,304,458,000
Accrued interest receivable | 13,646,000 | 12,770,000
Loans and leases receivable | 1,100,000,000 | 1,100,000,000
Loans 90 days or more past due and still accruing | 0 | 0
Commitments to lend additional funds to borrowers whose loans are impaired | 0 | 0
Non-accrual Non-PCI loans and leases | 18,283,000 | 15,805,000
Other real estate owned (OREO), net | 877,000 | 1,946,000
TDR loans receivable | $ 13,400,000 | 15,400,000
Principal and interest due | 3 months |
Reserves relating to loans included in allowance for loan losses | $ 2,800,000 | 2,200,000
Home equity line of credit [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total gross loans and leases receivable | 10,900,000 | 14,200,000
Loans and Finance Receivables [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accrued interest receivable | 11,200,000 | 10,200,000
Non-Accrual Loans and Leases, Excluding PCI Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual Non-PCI loans and leases | $ 1,600,000 | $ 900,000

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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