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Loans and Leases - Additional Information (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total gross loans and leases receivable | $ 4,575,620,000 | $ 4,600,540,000
Accrued interest receivable | 13,397,000 | 13,331,000
Loans and leases receivable pledged to secure advances | 1,100,000,000 | 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 | $ 10,000,000 | 10,300,000
Principal and interest due | 3 months |
Reserves relating to loans included in allowance for loan losses | $ 397,000 | 313,000
Home equity line of credit |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total gross loans and leases receivable | 9,900,000 | 10,300,000
Loans and lease receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accrued interest receivable | $ 11,500,000 | $ 10,900,000

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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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- Definition Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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- Definition Reflects the unfunded portion of contractual agreements to lend funds to borrowers for loans whose terms have been modified by troubled debt restructuring. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18794-111554 + Details
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