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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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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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