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Fair Value - Fair Value Measurement (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assumed Gain/(Loss) From Loan Sale	$ (1,734)
Interest Rate Movement Effect	(1,096)
Servicing Rights Value	8,978
Security Price Change	969
Total Fair Value Measurement Gain/(Loss)	7,117
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	668,936
Assumed Gain/(Loss) From Loan Sale	(1,433)
Interest Rate Movement Effect	(1,361)
Servicing Rights Value	6,405
Total Fair Value Measurement Gain/(Loss)	3,611
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	838,131
Security Price Change	969
Total Fair Value Measurement Gain/(Loss)	969
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	256,017
Assumed Gain/(Loss) From Loan Sale	(301)
Interest Rate Movement Effect	265
Servicing Rights Value	2,573
Total Fair Value Measurement Gain/(Loss)	$ 2,537

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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

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+ 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=84234895&loc=SL5624171-113959

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