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Goodwill and Intangibles - Summary of Changes in Carrying Amount of Goodwill and Core Deposit Intangible (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill |  |  |
Goodwill beginning balance | $ 58,488 | $ 58,621 | $ 9,353
Goodwill ending balance | 58,488 | 58,488 | 58,621
CDI |  |  |
Core deposit intangibles beginning balance | 7,567 | 9,412 | 3,409
Core deposit intangibles amortization of intangibles | (1,583) | (1,845) | (763)
Core deposit intangibles ending balance | $ 5,984 | 7,567 | 9,412
St. Martin Bancshares, Inc. |  |  |
Goodwill |  |  |
Goodwill acquired during period |  |  | 49,268
Goodwill acquired during period |  | (133) |
CDI |  |  |
Core deposit intangibles acquired during period |  | $ 0 | $ 6,766

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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e961-128460 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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