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Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 31,994 | $ 32,003
Accumulated Amortization | (17,058) | (15,533)
Net Carrying Amount | 14,936 | 16,470
Core Deposit Intangibles [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 25,907 | 25,907
Accumulated Amortization | (12,456) | (11,113)
Net Carrying Amount | 13,451 | 14,794
Customer Relationship Intangibles [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 5,699 | 5,699
Accumulated Amortization | (4,289) | (4,115)
Net Carrying Amount | 1,410 | 1,584
Mortgage Servicing Intangibles [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 388 | 397
Accumulated Amortization | (313) | (305)
Net Carrying Amount | $ 75 | $ 92

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