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Acquisition Activity - Summary of Acquisition Activity (Detail) - USD ($) $ in Thousands |  |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 06, 2017 | Sep. 15, 2015 | Feb. 14, 2014 | Jul. 15, 2011 | Mar. 12, 2010 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total Assets |  |  |  |  |  | $ 1,689,382 |  |  |
Total Loans |  |  |  |  |  | 1,175,891 |  |  |
Goodwill |  |  |  |  |  | 58,488 | $ 58,488 | $ 58,621 | $ 9,353
Core Deposit Intangible |  |  |  |  |  | 13,670 |  |  |
Total Deposits |  |  |  |  |  | 1,359,210 |  |  |
Nonaccretable Discount |  |  |  |  |  | $ 88,674 |  |  |
Statewide Bank |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total Assets |  |  |  |  | $ 188,026 |  |  |  |
Total Loans |  |  |  |  | 110,415 |  |  |  |
Goodwill |  |  |  |  | 560 |  |  |  |
Core Deposit Intangible |  |  |  |  | 1,429 |  |  |  |
Total Deposits |  |  |  |  | 206,925 |  |  |  |
Nonaccretable Discount |  |  |  |  | $ 61,478 |  |  |  |
GS Financial Corporation |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total Assets |  |  |  | $ 256,677 |  |  |  |  |
Total Loans |  |  |  | 182,440 |  |  |  |  |
Goodwill |  |  |  | 296 |  |  |  |  |
Core Deposit Intangible |  |  |  | 859 |  |  |  |  |
Total Deposits |  |  |  | 193,518 |  |  |  |  |
Nonaccretable Discount |  |  |  | $ 5,490 |  |  |  |  |
Britton & Koontz Capital Corporation |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total Assets |  |  | $ 298,930 |  |  |  |  |  |
Total Loans |  |  | 161,581 |  |  |  |  |  |
Goodwill |  |  | 43 |  |  |  |  |  |
Core Deposit Intangible |  |  | 3,030 |  |  |  |  |  |
Total Deposits |  |  | 216,600 |  |  |  |  |  |
Nonaccretable Discount |  |  | $ 17,946 |  |  |  |  |  |
Louisiana Bancorp, Inc. |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total Assets |  | $ 352,897 |  |  |  |  |  |  |
Total Loans |  | 281,583 |  |  |  |  |  |  |
Goodwill |  | 8,454 |  |  |  |  |  |  |
Core Deposit Intangible |  | 1,586 |  |  |  |  |  |  |
Total Deposits |  | 208,670 |  |  |  |  |  |  |
Nonaccretable Discount |  | $ 0 |  |  |  |  |  |  |
St. Martin Bancshares, Inc. |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total Assets | $ 592,852 |  |  |  |  |  |  |  |
Total Loans | 439,872 |  |  |  |  |  |  |  |
Goodwill | 49,135 |  |  |  |  |  |  |  |
Core Deposit Intangible | 6,766 |  |  |  |  |  |  |  |
Total Deposits | 533,497 |  |  |  |  |  |  |  |
Nonaccretable Discount | $ 3,760 |  |  |  |  |  |  |  |

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- Definition Change in the estimate of cash flows expected to be collected, after acquisition of a loan, which results in a decrease in accretable yield (for example, as a result of an other-than-temporary impairment). This relates to loans accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118938799&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 + Details
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