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Fair Value - Fair Value Measurement (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assumed Gain/(Loss) From Loan Sale | $ 2,153 |
Interest Rate Movement Effect | (4,310) |
Servicing Rights Value | 14,314 |
Security Price Change | 1,280 |
Total Fair Value Measurement Gain/(Loss) | 13,437 | $ 5,824
Mortgage Banking [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Rate Lock Commitments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Notional or Principal Amount | 864,355 |
Assumed Gain/(Loss) From Loan Sale | 1,486 |
Interest Rate Movement Effect | (2,376) |
Servicing Rights Value | 9,920 |
Total Fair Value Measurement Gain/(Loss) | 9,030 |
Mortgage Banking [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Forward Sales Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Notional or Principal Amount | 1,120,810 |
Security Price Change | 1,280 |
Total Fair Value Measurement Gain/(Loss) | 1,280 |
Mortgage Banking [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgages Held for Sale [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Notional or Principal Amount | 319,817 | 350,558
Assumed Gain/(Loss) From Loan Sale | 667 |
Interest Rate Movement Effect | (1,934) |
Servicing Rights Value | 4,394 |
Total Fair Value Measurement Gain/(Loss) | $ 3,127 | $ 1,931

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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