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Acquisition Activity (Tables)
 12 Months Ended
Dec. 31, 2019
Business Combinations [Abstract]  
Summary of 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
7/15/2011256,677  182,440  296  859  193,518  
Britton & Koontz Capital Corporation
2/14/2014298,930  161,581  43  3,030  216,600  
Louisiana Bancorp, Inc.
9/15/2015352,897  281,583  8,454  1,586  208,670  
St. Martin Bancshares, Inc.
12/6/2017592,852  439,872  49,135  6,766  533,497  
Total Acquisitions
$1,689,382  $1,175,891  $58,488  $13,670  $1,359,210  
Summary of Nonaccretable Discount on Acquired Loans
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
7/15/20115,490  
Britton & Koontz Capital Corporation
2/14/201417,946  
Louisiana Bancorp, Inc.
9/15/2015—  
St. Martin Bancshares, Inc.
12/6/20173,760  
Total$88,674  
Summary of Changes in Accretable Yield on the Loans Acquired with Deteriorated Credit Quality
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)
201920182017
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)