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Loans and the Allowance for Credit Losses - Schedule of Recorded Investment in Loans by Category (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | $ 7,737,854 | $ 7,656,281
Loans held for sale | 18,649 | 8,994
Total loans | 7,756,503 | 7,665,275
Commercial Real Estate - Land and Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | 483,046 | 528,072
Commercial Real Estate - Improved Property [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | 3,394,587 | 3,325,623
Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | 1,300,577 | 1,265,460
Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | 3,877,633 | 3,853,695
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | 1,633,613 | 1,611,607
Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | 335,728 | 326,188
Home Equity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | $ 590,303 | $ 599,331

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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. 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=118952595&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 + Details
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- Definition Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 + Details
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