Allowance for Credit Losses (ACL) - Disaggregated analysis of the changes in allowance for credit losses (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Jan. 01, 2025	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Allowance for credit losses
Balance at beginning of period	$ 465,280	$ 465,280	$ 456,573	$ 456,573
Allowance Adjustment - FMV for Independent merger		118,643
Independent Day 1 Loan Charge-offs PCD		(39,429)
Charge-offs		(7,422)
Charge-offs		(46,851)	(7,940)	(35,070)
Recoveries		2,982	5,261
Net (charge-offs) recoveries		(43,869)	(2,679)
Provision (benefit)		3,665	15,760
Balance at end of period		623,690	469,654	465,280
Independent
Allowance for credit losses
Allowance Adjustment - FMV for Independent merger	118,643
Initial Allowance for Non PCD loans acquired during period
Allowance for credit losses
Balance at end of period		79,971
Consumer loans
Allowance for credit losses
Charge-offs		(4,938)		(10,298)
Unfunded Commitment
Allowance for credit losses
Provision (recovery)		16,900	(3,100)
Unfunded Commitment | Independent
Allowance for credit losses
Provision (recovery)		12,100
Residential Mortgage Sr.
Allowance for credit losses
Balance at beginning of period	42,687	42,687	78,052	78,052
Allowance Adjustment - FMV for Independent merger		1,852
Independent Day 1 Loan Charge-offs PCD		(61)
Charge-offs		(507)
Charge-offs			(343)
Recoveries		200	123
Net (charge-offs) recoveries		(368)	(220)
Provision (benefit)		1,245	9,652
Balance at end of period		54,326	87,484	42,687
Residential Mortgage Sr. | Initial Allowance for Non PCD loans acquired during period
Allowance for credit losses
Balance at end of period		8,910
Residential Mortgage Jr.
Allowance for credit losses
Balance at beginning of period	432	432	745	745
Charge-offs		(13)
Recoveries		24	39
Net (charge-offs) recoveries		11	39
Provision (benefit)		265	446
Balance at end of period		793	1,230	432
Residential Mortgage Jr. | Initial Allowance for Non PCD loans acquired during period
Allowance for credit losses
Balance at end of period		85
HELOC
Allowance for credit losses
Balance at beginning of period	14,845	14,845	10,942	10,942
Charge-offs		(229)
Charge-offs			(110)
Recoveries		380	292
Net (charge-offs) recoveries		151	182
Provision (benefit)		(219)	600
Balance at end of period		14,868	11,724	14,845
HELOC | Initial Allowance for Non PCD loans acquired during period
Allowance for credit losses
Balance at end of period		91
Residential Construction
Allowance for credit losses
Balance at beginning of period	9,298	9,298	5,024	5,024
Charge-offs			(304)
Recoveries			7
Net (charge-offs) recoveries			(297)
Provision (benefit)		(1,443)	(175)
Balance at end of period		12,555	4,552	9,298
Residential Construction | Initial Allowance for Non PCD loans acquired during period
Allowance for credit losses
Balance at end of period		4,700
Commercial Construction and Development
Allowance for credit losses
Balance at beginning of period	65,553	65,553	65,772	65,772
Allowance Adjustment - FMV for Independent merger		6,448
Charge-offs			(1,475)
Recoveries		98	1,007
Net (charge-offs) recoveries		98	(468)
Provision (benefit)		(5,309)	(4,444)
Balance at end of period		78,541	60,860	65,553
Commercial Construction and Development | Initial Allowance for Non PCD loans acquired during period
Allowance for credit losses
Balance at end of period		11,751
Consumer
Allowance for credit losses
Balance at beginning of period	17,484	17,484	23,331	23,331
Allowance Adjustment - FMV for Independent merger		114
Independent Day 1 Loan Charge-offs PCD		(2,323)
Charge-offs		(1,805)
Charge-offs			(2,497)
Recoveries		830	1,125
Net (charge-offs) recoveries		(3,298)	(1,372)
Provision (benefit)		1,750	1,394
Balance at end of period		16,304	23,353	17,484
Consumer | Initial Allowance for Non PCD loans acquired during period
Allowance for credit losses
Balance at end of period		254
Multifamily
Allowance for credit losses
Balance at beginning of period	22,279	22,279	13,766	13,766
Allowance Adjustment - FMV for Independent merger		3,561
Recoveries			25
Net (charge-offs) recoveries			25
Provision (benefit)		4,315	3,221
Balance at end of period		33,960	17,012	22,279
Multifamily | Initial Allowance for Non PCD loans acquired during period
Allowance for credit losses
Balance at end of period		3,805
Municipal
Allowance for credit losses
Balance at beginning of period	1,197	1,197	900	900
Provision (benefit)		(2,037)	(24)
Balance at end of period		1,107	876	1,197
Municipal | Initial Allowance for Non PCD loans acquired during period
Allowance for credit losses
Balance at end of period		1,947
CRE Owner Occupied
Allowance for credit losses
Balance at beginning of period	78,753	78,753	71,580	71,580
Allowance Adjustment - FMV for Independent merger		8,075
Independent Day 1 Loan Charge-offs PCD		(1,302)
Charge-offs		(204)
Recoveries		50	103
Net (charge-offs) recoveries		(1,456)	103
Provision (benefit)		13,098	914
Balance at end of period		101,656	72,597	78,753
CRE Owner Occupied | Initial Allowance for Non PCD loans acquired during period
Allowance for credit losses
Balance at end of period		3,186
Non Owner Occupied CRE
Allowance for credit losses
Balance at beginning of period	111,538	111,538	137,055	137,055
Allowance Adjustment - FMV for Independent merger		93,820
Independent Day 1 Loan Charge-offs PCD		(13,556)
Charge-offs			(71)
Recoveries		96	10
Net (charge-offs) recoveries		(13,460)	(61)
Provision (benefit)		(51,121)	(2,296)
Balance at end of period		172,334	134,698	111,538
Non Owner Occupied CRE | Initial Allowance for Non PCD loans acquired during period
Allowance for credit losses
Balance at end of period		31,557
C & I
Allowance for credit losses
Balance at beginning of period	$ 101,214	101,214	49,406	49,406
Allowance Adjustment - FMV for Independent merger		4,773
Independent Day 1 Loan Charge-offs PCD		(22,187)
Charge-offs		(4,664)
Charge-offs			(3,140)
Recoveries		1,304	2,530
Net (charge-offs) recoveries		(25,547)	(610)
Provision (benefit)		43,121	6,472
Balance at end of period		137,246	$ 55,268	$ 101,214
C & I | Initial Allowance for Non PCD loans acquired during period
Allowance for credit losses
Balance at end of period		$ 13,685