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Goodwill and Intangible Assets - Schedule of Acquired Intangible Assets, Other than Goodwill (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 16,975 | $ 16,902
Accumulated Amortization | 8,120 | 7,550
Net Carrying Amount | 8,855 | 9,352
MSRs [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 2,183 | 2,110
Accumulated Amortization | 541 | 446
Net Carrying Amount | 1,642 | 1,664
Core deposit intangibles [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 14,792 | 14,792
Accumulated Amortization | 7,579 | 7,104
Net Carrying Amount | $ 7,213 | $ 7,688

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