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Fair Value - Fair Value Measurement (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assumed Gain/(Loss) From Loan Sale | $ (870) |
Interest Rate Movement Effect | (2,133) |
Servicing Rights Value | 8,502 |
Security Price Change | 325 |
Total Fair Value Measurement Gain/(Loss) | 5,824 | $ 4,186
Mortgage Banking: | Level 2 | Fair Value, Measurements, Recurring | Rate lock commitments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Notional or Principal Amount | 490,184 |
Assumed Gain/(Loss) From Loan Sale | (666) |
Interest Rate Movement Effect | (407) |
Servicing Rights Value | 4,641 |
Security Price Change | 0 |
Total Fair Value Measurement Gain/(Loss) | 3,568 |
Mortgage Banking: | Level 2 | Fair Value, Measurements, Recurring | Forward sales contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Notional or Principal Amount | 705,405 |
Assumed Gain/(Loss) From Loan Sale | 0 |
Interest Rate Movement Effect | 0 |
Servicing Rights Value | 0 |
Security Price Change | 325 |
Total Fair Value Measurement Gain/(Loss) | 325 |
Mortgage Banking: | Level 2 | Fair Value, Measurements, Recurring | Mortgages held for sale |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Notional or Principal Amount | 350,558 | 357,912
Assumed Gain/(Loss) From Loan Sale | (204) |
Interest Rate Movement Effect | (1,726) |
Servicing Rights Value | 3,861 |
Security Price Change | 0 |
Total Fair Value Measurement Gain/(Loss) | $ 1,931 | $ (5,954)

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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