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Intangible Assets and Goodwill - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 32,003 | $ 23,585
Accumulated Amortization | (15,533) | (12,503)
Net Carrying Amount | 16,470 | 11,082
Core Deposit Intangibles [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 25,907 | 17,447
Accumulated Amortization | (11,113) | (8,451)
Net Carrying Amount | 14,794 | 8,996
Customer Relationship Intangibles [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 5,699 | 5,699
Accumulated Amortization | (4,115) | (3,767)
Net Carrying Amount | 1,584 | 1,932
Mortgage Servicing Intangibles [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 397 | 439
Accumulated Amortization | (305) | (285)
Net Carrying Amount | $ 92 | $ 154

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