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Goodwill and Intangible Assets - Schedule of Acquired Intangible Assets, Other than Goodwill (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 16,857	$ 8,339
Accumulated Amortization	7,209	7,060
Net Carrying Amount	9,648	1,279
MSRs [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,065	1,065
Accumulated Amortization	386	322
Net Carrying Amount	1,679	743
Core deposit intangibles [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	14,792	7,274
Accumulated Amortization	6,823	6,738
Net Carrying Amount	$ 7,969	$ 536

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-Topic 350
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
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