Loans Receivable, Net - ACL Activity (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Allowance for credit losses
Balance at beginning of period	$ 192,757	$ 182,283	$ 182,283
Acquisitions	3
Provision for credit losses	9,091	6,260
Charge-offs	(4,295)	(3,293)
Recoveries	1,223	1,354
Balance at end of period	198,779	186,604	192,757
Residential real estate
Allowance for credit losses
Balance at beginning of period	22,325	19,683	19,683
Acquisitions	0
Provision for credit losses	1,837	293
Charge-offs	0	(5)	(20)
Recoveries	4	3
Balance at end of period	24,166	19,974	22,325
Commercial real estate
Allowance for credit losses
Balance at beginning of period	130,924	125,816	125,816
Acquisitions	3
Provision for credit losses	4,207	4,704
Charge-offs	0	(347)	(2,080)
Recoveries	19	80
Balance at end of period	135,153	130,253	130,924
Other commercial
Allowance for credit losses
Balance at beginning of period	21,194	21,454	21,454
Acquisitions	0
Provision for credit losses	2,293	(121)
Charge-offs	(1,932)	(772)	(3,891)
Recoveries	539	603
Balance at end of period	22,094	21,164	21,194
Home equity
Allowance for credit losses
Balance at beginning of period	11,766	10,759	10,759
Acquisitions	0
Provision for credit losses	(764)	(230)
Charge-offs	(25)	(4)	(129)
Recoveries	22	45
Balance at end of period	10,999	10,570	11,766
Other consumer
Allowance for credit losses
Balance at beginning of period	6,548	4,571	4,571
Acquisitions	0
Provision for credit losses	1,518	1,614
Charge-offs	(2,338)	(2,165)	(8,975)
Recoveries	639	623
Balance at end of period	$ 6,367	$ 4,643	$ 6,548