Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Interest income
Loans	$ 120,244	$ 76,779	$ 348,315	$ 194,631
Investment securities	13,868	10,906	40,400	28,669
Interest earning deposits with banks and other interest income	5,271	1,452	14,295	2,102
Total interest income	139,383	89,137	403,010	225,402
Interest expense
Interest bearing demand deposits	16,668	4,934	46,201	6,258
Savings and money market deposits	11,045	3,609	28,409	5,719
Time deposits	22,482	4,717	53,844	13,501
Advances from the Federal Home Loan Bank	8,207	3,977	22,591	9,799
Senior notes	942	941	2,825	2,825
Subordinated notes	361	362	1,084	811
Junior subordinated debentures	1,097	700	3,264	2,002
Securities sold under agreements to repurchase	4	0	5	0
Total interest expense	60,806	19,240	158,223	40,915
Net interest income	78,577	69,897	244,787	184,487
Provision for (reversal of) credit losses	8,000	7,314	48,777	(2,912)
Net interest income after provision for (reversal of) credit losses	70,577	62,583	196,010	187,399
Noninterest income
Deposits and service fees	5,053	4,629	14,952	13,826
Brokerage, advisory and fiduciary activities	4,370	4,619	12,808	13,654
Change in cash surrender value of bank owned life insurance	1,483	1,352	4,324	4,028
Loan-level derivative income	1,196	2,786	3,743	6,947
Cards and trade finance servicing fees	734	622	1,829	1,720
Gain (loss) on early extinguishment of advances from the Federal Home Loan Bank, net	7,010	0	33,623	(712)
Derivative (losses) gains, net	(77)	(95)	179	(585)
Securities (losses) gains, net	(54)	1,508	(11,022)	(325)
Other noninterest income	2,206	535	7,447	4,359
Total noninterest income	21,921	15,956	67,883	42,912
Noninterest expense
Salaries and employee benefits	31,334	30,109	100,457	90,724
Occupancy and equipment	7,293	6,559	20,828	21,044
Professional and other services fees	5,325	5,045	20,368	15,918
Telecommunication and data processing	3,556	3,861	11,647	11,113
Advertising expenses	2,724	2,066	9,642	8,291
FDIC assessments and insurance	2,590	1,746	8,066	4,668
Depreciation and amortization	1,795	1,481	5,362	3,927
Loan-level derivative expense	18	1,810	1,728	4,865
Other real estate owned and repossessed assets (income) expense, net	(134)	234	2,297	3,408
Contract termination costs	0	289	1,550	7,103
Loans held for sale valuation expense	5,562	0	5,562	159
Other operating expenses	4,357	2,913	14,146	7,952
Total noninterest expenses	64,420	56,113	201,653	179,172
Income before income tax expense	28,078	22,426	62,240	51,139
Income tax expense	(6,337)	(4,936)	(13,511)	(10,994)
Net income before attribution of noncontrolling interest	21,741	17,490	48,729	40,145
Noncontrolling interest	(378)	(44)	(884)	(1,192)
Net income attributable to Amerant Bancorp Inc.	22,119	17,534	49,613	41,337
Other comprehensive loss, net of tax
Net unrealized holding losses on debt securities available for sale arising during the period	(18,569)	(34,959)	(25,939)	(101,038)
Net unrealized holding gains (losses) on cash flow hedges arising during the period	129	(16)	217	162
Reclassification adjustment for items included in net income	(268)	(274)	723	(549)
Other comprehensive loss	(18,708)	(35,249)	(24,999)	(101,425)
Comprehensive income (loss)	$ 3,411	$ (17,715)	$ 24,614	$ (60,088)
Earnings Per Share (Note 18):
Basic earnings per common share (in dollars per share)	$ 0.66	$ 0.52	$ 1.48	$ 1.22
Diluted earnings per common share (in dollars per share)	$ 0.66	$ 0.52	$ 1.47	$ 1.21