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Business Segments (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Segment
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Segment Reporting Information      
Number of business segments | Segment 3    
Segment Reporting Information, Revenue for Reportable Segment [Abstract]      
Interest and dividend income $ 302,929 $ 326,084  
Interest expense 72,587 75,600  
Net interest income 230,342 250,484  
Other Income and Expenses [Abstract]      
Provision for (reversal of) expected credit losses 68,971 13,763  
Other non-interest income (expense) 35,475 35,435  
Allocated expenses (income) 0 0  
Non-interest expense 177,427 158,753  
Income before income tax expense 48,600 130,477  
Income tax expense 12,175 30,346  
Net income 36,425 100,131  
Total loans, leases, and loans held for sale, net of unearned income 24,749,477 23,096,746  
Total assets 32,239,983 31,260,189 $ 31,713,450
Total deposits 25,526,237 24,092,062 $ 25,219,349
Average assets 31,986,139 30,833,500  
Mortgage income      
Other Income and Expenses [Abstract]      
Non-interest income 23,245 11,849  
Title revenue      
Other Income and Expenses [Abstract]      
Non-interest income 5,936 5,225  
Operating Segments | IBERIABANK      
Segment Reporting Information, Revenue for Reportable Segment [Abstract]      
Interest and dividend income 300,930 324,644  
Interest expense 72,587 75,600  
Net interest income 228,343 249,044  
Other Income and Expenses [Abstract]      
Provision for (reversal of) expected credit losses 68,960 13,823  
Other non-interest income (expense) 35,465 35,463  
Allocated expenses (income) (1,729) (2,033)  
Non-interest expense 155,333 143,755  
Income before income tax expense 41,244 128,962  
Income tax expense 10,384 29,975  
Net income 30,860 98,987  
Total loans, leases, and loans held for sale, net of unearned income 24,522,757 22,944,800  
Total assets 31,914,337 31,044,209  
Total deposits 25,497,777 24,078,698  
Average assets 31,694,266 30,660,806  
Operating Segments | IMC      
Segment Reporting Information, Revenue for Reportable Segment [Abstract]      
Interest and dividend income 1,999 1,439  
Interest expense 0 0  
Net interest income 1,999 1,439  
Other Income and Expenses [Abstract]      
Provision for (reversal of) expected credit losses 11 (60)  
Other non-interest income (expense) 10 (12)  
Allocated expenses (income) 1,305 1,500  
Non-interest expense 16,910 10,541  
Income before income tax expense 7,028 1,295  
Income tax expense 1,603 307  
Net income 5,425 988  
Total loans, leases, and loans held for sale, net of unearned income 226,720 151,946  
Total assets 298,030 191,254  
Total deposits 28,460 13,364  
Average assets 264,341 148,174  
Operating Segments | LTC      
Segment Reporting Information, Revenue for Reportable Segment [Abstract]      
Interest and dividend income 0 1  
Interest expense 0 0  
Net interest income 0 1  
Other Income and Expenses [Abstract]      
Provision for (reversal of) expected credit losses 0 0  
Other non-interest income (expense) 0 (16)  
Allocated expenses (income) 424 533  
Non-interest expense 5,184 4,457  
Income before income tax expense 328 220  
Income tax expense 188 64  
Net income 140 156  
Total loans, leases, and loans held for sale, net of unearned income 0 0  
Total assets 27,616 24,726  
Total deposits 0  
Average assets 27,532 24,520  
Operating Segments | Mortgage income | IBERIABANK      
Other Income and Expenses [Abstract]      
Non-interest income 0 0  
Operating Segments | Mortgage income | IMC      
Other Income and Expenses [Abstract]      
Non-interest income 23,245 11,849  
Operating Segments | Mortgage income | LTC      
Other Income and Expenses [Abstract]      
Non-interest income 0 0  
Operating Segments | Title revenue | IBERIABANK      
Other Income and Expenses [Abstract]      
Non-interest income 0 0  
Operating Segments | Title revenue | IMC      
Other Income and Expenses [Abstract]      
Non-interest income 0 0  
Operating Segments | Title revenue | LTC      
Other Income and Expenses [Abstract]      
Non-interest income $ 5,936 $ 5,225