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Allowance for Credit Losses (ACL) - Disaggregated analysis of the changes in allowance for credit losses (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 01, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Allowance for credit losses
Balance at beginning of period		$ 370,645	$ 300,396	$ 356,444	$ 301,807	$ 301,807
Allowance Adjustment - FMV for ACBI merger			4,540		4,540
Adjusted CECL balance			304,936		304,936
Charge-offs		(7,578)	(6,163)	(12,205)	(11,653)	(23,446)
Recoveries		4,268	3,824	7,857	6,991
Net (charge-offs) recoveries		(3,310)	(2,339)	(4,348)	(4,662)
Provision (recovery)		60,057	17,111	75,296	(4,892)
Balance at end of period		427,392	319,708	427,392	319,708	356,444
Quantitative allowance
Collectively evaluated		435,558	258,437	435,558	258,437
Individually evaluated		16,264	16,932	16,264	16,932
Total quantitative allowance		451,822	275,369	451,822	275,369
Qualitative allowance		(24,430)	44,339	(24,430)	44,339
Unfunded Commitment
Allowance for credit losses
Provision (recovery)		21,700	2,200	3,800	2,000
Initial PCD Allowance
Allowance for credit losses
Balance at end of period			13,758		13,758
Initial Non PCD Allowance
Allowance for credit losses
Balance at end of period			13,697		13,697
Residential Mortgage Sr.
Allowance for credit losses
Balance at beginning of period		77,351	46,002	72,188	47,036	47,036
Allowance Adjustment - FMV for ACBI merger			727		727
Adjusted CECL balance			46,729		46,729
Charge-offs		(37)	(61)	(39)	(119)
Recoveries		302	361	596	755
Net (charge-offs) recoveries		265	300	557	636
Provision (recovery)		3,853	8,678	8,724	6,872
Balance at end of period		81,469	55,707	81,469	55,707	72,188
Quantitative allowance
Collectively evaluated		82,205	55,203	82,205	55,203
Individually evaluated		174	479	174	479
Total quantitative allowance		82,379	55,682	82,379	55,682
Qualitative allowance		(910)	25	(910)	25
Residential Mortgage Sr. | Initial PCD Allowance
Allowance for credit losses
Balance at end of period			811		811
Residential Mortgage Sr. | Initial Non PCD Allowance
Allowance for credit losses
Balance at end of period			352		352
Residential Mortgage Jr.
Allowance for credit losses
Balance at beginning of period		349	586	405	611	611
Adjusted CECL balance			586		586
Charge-offs					(19)
Recoveries		3	110	8	165
Net (charge-offs) recoveries		3	110	8	146
Provision (recovery)		40	(163)	(21)	(250)
Balance at end of period		392	533	392	533	405
Quantitative allowance
Collectively evaluated		393	533	393	533
Total quantitative allowance		393	533	393	533
Qualitative allowance		(1)		(1)
Residential Mortgage Jr. | Initial Non PCD Allowance
Allowance for credit losses
Balance at end of period			26		26
HELOC
Allowance for credit losses
Balance at beginning of period		14,318	13,671	14,886	13,325	13,325
Adjusted CECL balance			13,671		13,671
Charge-offs			(203)	(39)	(421)
Recoveries		532	395	777	652
Net (charge-offs) recoveries		532	192	738	231
Provision (recovery)		(638)	3,055	(1,412)	3,230
Balance at end of period		14,212	16,918	14,212	16,918	14,886
Quantitative allowance
Collectively evaluated		12,083	13,488	12,083	13,488
Individually evaluated		2,331	3,418	2,331	3,418
Total quantitative allowance		14,414	16,906	14,414	16,906
Qualitative allowance		(202)	12	(202)	12
HELOC | Initial Non PCD Allowance
Allowance for credit losses
Balance at end of period			132		132
Residential Construction
Allowance for credit losses
Balance at beginning of period		9,176	5,616	8,974	4,997	4,997
Adjusted CECL balance			5,616		5,616
Recoveries		22	2	94	5
Net (charge-offs) recoveries		22	2	94	5
Provision (recovery)		(329)	1,947	(199)	2,561
Balance at end of period		8,869	7,565	8,869	7,565	8,974
Quantitative allowance
Collectively evaluated		8,779	7,565	8,779	7,565
Total quantitative allowance		8,779	7,565	8,779	7,565
Qualitative allowance		90		90
Residential Construction | Initial Non PCD Allowance
Allowance for credit losses
Balance at end of period			2		2
Commercial Construction and Development
Allowance for credit losses
Balance at beginning of period		55,069	25,358	45,410	37,593	37,593
Adjusted CECL balance			25,358		25,358
Charge-offs		(2)		(2)	(4)
Recoveries		198	410	456	644
Net (charge-offs) recoveries		196	410	454	640
Provision (recovery)		49	1,962	9,450	(12,476)
Balance at end of period		55,314	27,730	55,314	27,730	45,410
Quantitative allowance
Collectively evaluated		84,827	21,572	84,827	21,572
Individually evaluated			865		865
Total quantitative allowance		84,827	22,437	84,827	22,437
Qualitative allowance		(29,513)	5,293	(29,513)	5,293
Commercial Construction and Development | Initial PCD Allowance
Allowance for credit losses
Balance at end of period			86		86
Commercial Construction and Development | Initial Non PCD Allowance
Allowance for credit losses
Balance at end of period			1,887		1,887
Consumer
Allowance for credit losses
Balance at beginning of period		23,319	21,899	22,767	23,149	23,149
Adjusted CECL balance			21,899		21,899
Charge-offs		(3,017)	(2,124)	(5,746)	(4,785)
Recoveries		520	660	1,104	1,192
Net (charge-offs) recoveries		(2,497)	(1,464)	(4,642)	(3,593)
Provision (recovery)		3,755	4,317	6,452	5,145
Balance at end of period		24,577	24,752	24,577	24,752	22,767
Quantitative allowance
Collectively evaluated		24,577	24,752	24,577	24,752
Total quantitative allowance		24,577	24,752	24,577	24,752
Consumer | Initial Non PCD Allowance
Allowance for credit losses
Balance at end of period			51		51
Multifamily
Allowance for credit losses
Balance at beginning of period		5,507	3,903	3,684	4,921	4,921
Adjusted CECL balance			3,903		3,903
Provision (recovery)		4,260	(1,445)	6,083	(2,889)
Balance at end of period		9,767	2,458	9,767	2,458	3,684
Quantitative allowance
Collectively evaluated		9,680	2,458	9,680	2,458
Total quantitative allowance		9,680	2,458	9,680	2,458
Qualitative allowance		87		87
Multifamily | Initial Non PCD Allowance
Allowance for credit losses
Balance at end of period			426		426
Municipal
Allowance for credit losses
Balance at beginning of period		879	607	849	565	565
Adjusted CECL balance			607		607
Provision (recovery)		(134)	96	(104)	138
Balance at end of period		745	703	745	703	849
Quantitative allowance
Collectively evaluated		670	703	670	703
Total quantitative allowance		670	703	670	703
Qualitative allowance		75		75
CRE Owner Occupied
Allowance for credit losses
Balance at beginning of period		57,541	49,094	58,083	61,794	61,794
Allowance Adjustment - FMV for ACBI merger			930		930
Adjusted CECL balance			50,024		50,024
Charge-offs		(35)	(78)	(35)	(449)
Recoveries		93	94	386	408
Net (charge-offs) recoveries		58	16	351	(41)
Provision (recovery)		13,160	14,648	12,325	(1,993)
Balance at end of period		70,759	64,688	70,759	64,688	58,083
Quantitative allowance
Collectively evaluated		62,998	42,294	62,998	42,294
Individually evaluated		6,936	5,588	6,936	5,588
Total quantitative allowance		69,934	47,882	69,934	47,882
Qualitative allowance		825	16,806	825	16,806
CRE Owner Occupied | Initial PCD Allowance
Allowance for credit losses
Balance at end of period			2,409		2,409
CRE Owner Occupied | Initial Non PCD Allowance
Allowance for credit losses
Balance at end of period			2,519		2,519
Non Owner Occupied CRE
Allowance for credit losses
Balance at beginning of period		82,473	96,360	78,485	79,649	79,649
Adjusted CECL balance			96,360		96,360
Charge-offs			(360)	(51)	(360)
Recoveries		334	304	440	373
Net (charge-offs) recoveries		334	(56)	389	13
Provision (recovery)		32,462	(11,135)	36,395	2,810
Balance at end of period		115,269	85,169	115,269	85,169	78,485
Quantitative allowance
Collectively evaluated		112,563	63,666	112,563	63,666
Individually evaluated		1,723	140	1,723	140
Total quantitative allowance		114,286	63,806	114,286	63,806
Qualitative allowance		983	21,363	983	21,363
Non Owner Occupied CRE | Initial Non PCD Allowance
Allowance for credit losses
Balance at end of period			2,697		2,697
C & I
Allowance for credit losses
Balance at beginning of period		44,663	37,300	50,713	28,167	28,167
Allowance Adjustment - FMV for ACBI merger			2,883		2,883
Adjusted CECL balance			40,183		40,183
Charge-offs		(4,487)	(3,337)	(6,293)	(5,496)
Recoveries		2,264	1,488	3,996	2,797
Net (charge-offs) recoveries		(2,223)	(1,849)	(2,297)	(2,699)
Provision (recovery)		3,579	(4,849)	(2,397)	(8,040)
Balance at end of period		46,019	33,485	46,019	33,485	$ 50,713
Quantitative allowance
Collectively evaluated		36,783	26,203	36,783	26,203
Individually evaluated		5,100	6,442	5,100	6,442
Total quantitative allowance		41,883	32,645	41,883	32,645
Qualitative allowance		$ 4,136	840	$ 4,136	840
C & I | Initial PCD Allowance
Allowance for credit losses
Balance at end of period			10,452		10,452
C & I | Initial Non PCD Allowance
Allowance for credit losses
Balance at end of period			$ 5,605		$ 5,605
Atlantic Capital
Allowance for credit losses
Charge-offs	$ (22,100)

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- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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The valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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The valuation allowance for financing receivables that are expected to be uncollectible that were individually and collectively evaluated for impairment.

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Represents the adjusted Current Expected Credit Losses (CECL) balance.

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Represents the amount of allowance Adjustment of Fair market value for ACBI merger.

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Amount of qualitative allowance for credit loss on financing receivable.

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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
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- Definition

Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (e)
-Publisher FASB
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Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

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-Topic 326
-SubTopic 20
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-Section 50
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-URI https://asc.fasb.org//1943274/2147479319/326-20-50-6

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Amount, excluding accrued interest, of decrease (increase) in allowance for credit loss on financing receivable from writeoff (recovery). Excludes net investment in lease.

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Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

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