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Acquisition Activity | 12 Months Ended
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Dec. 31, 2019
Business Combinations [Abstract] |
Acquisition Activity | Acquisition Activity SUMMARY OF ACQUISITION ACTIVITY
(dollars in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  | Acquisition Date |  | Total Assets |  | Total Loans |  | Goodwill |  | Core Deposit Intangible |  | Total Deposits
Statewide Bank |  | 3/12/2010 |  | $ | 188,026 |  |  | $ | 110,415 |  |  | $ | 560 |  |  | $ | 1,429 |  |  | $ | 206,925 |
GS Financial Corporation |  | 7/15/2011 |  | 256,677 |  |  | 182,440 |  |  | 296 |  |  | 859 |  |  | 193,518 |
Britton & Koontz Capital Corporation |  | 2/14/2014 |  | 298,930 |  |  | 161,581 |  |  | 43 |  |  | 3,030 |  |  | 216,600 |
Louisiana Bancorp, Inc. |  | 9/15/2015 |  | 352,897 |  |  | 281,583 |  |  | 8,454 |  |  | 1,586 |  |  | 208,670 |
St. Martin Bancshares, Inc. |  | 12/6/2017 |  | 592,852 |  |  | 439,872 |  |  | 49,135 |  |  | 6,766 |  |  | 533,497 |
Total Acquisitions |  |  |  | $ | 1,689,382 |  |  | $ | 1,175,891 |  |  | $ | 58,488 |  |  | $ | 13,670 |  |  | $ | 1,359,210 |
Acquired loans which are impaired as of the date of acquisition are accounted for under ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality. The nonaccretable discount on acquired loans as of the acquisition date and aggregated by bank are summarized below. The balances represented an estimate of the undiscounted loss exposure in the acquired loans with deteriorated credit quality as of the acquisition date.
|  | (dollars in thousands) |  |
Acquisition |  | Acquisition Date |  | Nonaccretable Discount
Statewide Bank |  | 3/12/2010 |  | $ | 61,478 |
GS Financial Corporation |  | 7/15/2011 |  | 5,490 |
Britton & Koontz Capital Corporation |  | 2/14/2014 |  | 17,946 |
Louisiana Bancorp, Inc. |  | 9/15/2015 |  | — |
St. Martin Bancshares, Inc. |  | 12/6/2017 |  | 3,760 |
Total |  |  |  | $ | 88,674 |
The following table summarizes the changes in accretable yield on loans acquired with deteriorated credit quality for the years ended December 31, 2019, 2018 and 2017, respectively.
(dollars in thousands) |  | 2019 |  | 2018 |  | 2017
Balance, beginning of period |  | $ | (9,147) |  |  | $ | (9,303) |  |  | $ | (11,091) |
Acquisition accretable yield |  | — |  |  | — |  |  | (1,981) |
Accretion |  | 2,202 |  |  | 2,425 |  |  | 5,109 |
Net transfers from nonaccretable discount to accretable yield |  | (428) |  |  | (2,269) |  |  | (1,340) |
Balance, end of period |  | $ | (7,373) |  |  | $ | (9,147) |  |  | $ | (9,303) |
As of December 31, 2019, the weighted average remaining contractual life of the loan portfolio acquired with deteriorated credit quality was 5.5 years.

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- Definition The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -URI http://asc.fasb.org/topic&trid=2303972 + Details
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