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Intangible Assets and Goodwill - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 39,247 | $ 32,003
Accumulated Amortization | (16,639) | (15,533)
Net Carrying Amount | 22,608 | 16,470
Core Deposit Intangibles [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 35,856 | 25,907
Accumulated Amortization | (14,131) | (11,113)
Net Carrying Amount | 21,725 | 14,794
Customer Relationship Intangibles [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 3,391 | 5,699
Accumulated Amortization | (2,508) | (4,115)
Net Carrying Amount | $ 883 | 1,584
Mortgage Servicing Intangibles [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount |  | 397
Accumulated Amortization |  | (305)
Net Carrying Amount |  | $ 92

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