Loans Receivable, Net - ACL Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Allowance for credit losses
Balance at beginning of period	$ 200,955	$ 189,385	$ 192,757	$ 182,283	$ 182,283
Acquisitions			3
Provision for credit losses	6,981	5,095	21,138	16,609
Charge-offs	(3,976)	(3,201)	(12,406)	(10,284)
Recoveries	1,210	992	3,678	3,663
Balance at end of period	205,170	192,271	205,170	192,271	192,757
Residential real estate
Allowance for credit losses
Balance at beginning of period	24,653	20,847	22,325	19,683	19,683
Acquisitions			0
Provision for credit losses	626	848	2,934	2,021
Charge-offs	0	0	0	(20)	(20)
Recoveries	10	2	30	13
Balance at end of period	25,289	21,697	25,289	21,697	22,325
Commercial real estate
Allowance for credit losses
Balance at beginning of period	136,346	129,598	130,924	125,816	125,816
Acquisitions			3
Provision for credit losses	2,176	1,415	7,965	5,369
Charge-offs	0	(203)	(395)	(619)	(2,080)
Recoveries	25	42	50	286
Balance at end of period	138,547	130,852	138,547	130,852	130,924
Other commercial
Allowance for credit losses
Balance at beginning of period	22,219	21,797	21,194	21,454	21,454
Acquisitions			0
Provision for credit losses	1,947	306	5,321	1,845
Charge-offs	(1,456)	(654)	(4,849)	(2,895)	(3,891)
Recoveries	459	322	1,503	1,367
Balance at end of period	23,169	21,771	23,169	21,771	21,194
Home equity
Allowance for credit losses
Balance at beginning of period	11,261	11,053	11,766	10,759	10,759
Acquisitions			0
Provision for credit losses	145	534	(409)	881
Charge-offs	(2)	0	(27)	(102)	(129)
Recoveries	54	37	128	86
Balance at end of period	11,458	11,624	11,458	11,624	11,766
Other consumer
Allowance for credit losses
Balance at beginning of period	6,476	6,090	6,548	4,571	4,571
Acquisitions			0
Provision for credit losses	2,087	1,992	5,327	6,493
Charge-offs	(2,518)	(2,344)	(7,135)	(6,648)	(8,975)
Recoveries	662	589	1,967	1,911
Balance at end of period	$ 6,707	$ 6,327	$ 6,707	$ 6,327	$ 6,548