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Loans and Leases - Loans Receivable to Loans Held for Sale (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Reclassification From Portfolio Loans To Loans Held For Sale [Roll Forward] |  |  |
Balance at beginning of period | $ 9,316 | $ 2,874 |
Origination of loans held for sale | 109,111 | 91,367 |
Reclassification from loans receivable to loans held for sale | 0 | 0 | $ 360
Sales of loans held for sale | (111,977) | (84,901) |
Principal payoffs and amortization | (56) | (24) |
Balance at end of period | 6,394 | 9,316 | 2,874
Real estate loans [Member] |  |  |
Financing Receivable, Reclassification From Portfolio Loans To Loans Held For Sale [Roll Forward] |  |  |
Balance at beginning of period | 7,410 | 840 |
Origination of loans held for sale | 70,710 | 65,416 |
Sales of loans held for sale | (74,344) | (58,836) |
Principal payoffs and amortization | (30) | (10) |
Balance at end of period | 3,746 | 7,410 | 840
Commercial and industrial loans [Member] |  |  |
Financing Receivable, Reclassification From Portfolio Loans To Loans Held For Sale [Roll Forward] |  |  |
Balance at beginning of period | 1,906 | 2,034 |
Origination of loans held for sale | 38,401 | 25,951 |
Sales of loans held for sale | (37,633) | (26,065) |
Principal payoffs and amortization | (26) | (14) |
Balance at end of period | $ 2,648 | $ 1,906 | $ 2,034

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- Definition Financing Receivable, Reclassification From Loans Receivable To Loans Held For Sale [Roll Forward] + References No definition available. + Details
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- Definition Principal payoffs and amortization. + References No definition available. + Details
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- Definition Amount, after allowance for bad debt, of loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 The amount of cash paid for the origination of mortgages that are held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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- Definition The cash inflow resulting from the sale of loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3337-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3461-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 230 -Section 55 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82926135&loc=d3e60097-112785 + Details
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- Definition Value of loans and leases held in the entity's portfolio transferred to loans and leases held-for-sale in noncash transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 + Details
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