Loans Receivable, Net - Aging Analysis (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	$ 18,532,740	$ 17,261,849
Accruing loans 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	41,100	25,347
Accruing loans 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	13,303	6,881
Accruing loans 90 days or more past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	11,371	6,177
Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	101,130	58,850
Non-accrual loans with no ACL	34,914	20,060
Non-accrual loans with ACL	442	385
Current loans receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	18,431,610	17,202,999
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	1,931,554	1,858,929
Residential real estate | Accruing loans 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	9,625	5,195
Residential real estate | Accruing loans 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	1,323	404
Residential real estate | Accruing loans 90 days or more past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	2,116	1,509
Residential real estate | Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	20,417	14,033
Non-accrual loans with no ACL	7,278	6,850
Non-accrual loans with ACL	75	75
Residential real estate | Current loans receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	1,911,137	1,844,896
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	11,935,109	10,963,713
Commercial real estate | Accruing loans 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	19,314	8,852
Commercial real estate | Accruing loans 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	3,006	2,792
Commercial real estate | Accruing loans 90 days or more past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	2,616	2,899
Commercial real estate | Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	34,815	22,555
Non-accrual loans with no ACL	9,879	8,012
Non-accrual loans with ACL	0	0
Commercial real estate | Current loans receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	11,900,294	10,941,158
Other commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	3,303,889	3,119,535
Other commercial | Accruing loans 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	7,082	6,261
Other commercial | Accruing loans 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	5,407	1,180
Other commercial | Accruing loans 90 days or more past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	5,221	985
Other commercial | Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	32,160	10,284
Non-accrual loans with no ACL	14,163	1,691
Non-accrual loans with ACL	287	167
Other commercial | Current loans receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	3,271,729	3,109,251
Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	975,429	930,994
Home equity | Accruing loans 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	2,582	1,965
Home equity | Accruing loans 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	2,669	1,699
Home equity | Accruing loans 90 days or more past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	978	646
Home equity | Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	9,034	7,136
Non-accrual loans with no ACL	2,805	2,826
Non-accrual loans with ACL	0	0
Home equity | Current loans receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	966,395	923,858
Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	386,759	388,678
Other consumer | Accruing loans 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	2,497	3,074
Other consumer | Accruing loans 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	898	806
Other consumer | Accruing loans 90 days or more past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	440	138
Other consumer | Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	4,704	4,842
Non-accrual loans with no ACL	789	681
Non-accrual loans with ACL	80	143
Other consumer | Current loans receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	$ 382,055	$ 383,836