Loans Receivable, Net - Aging Analysis (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	$ 16,851,991	$ 16,198,082
Accruing loans 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	20,978	43,455
Accruing loans 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	28,700	6,512
Accruing loans 90 days or more past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	4,692	3,312
Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	67,056	74,095
Non-accrual loans with no ACL	10,428	20,722
Non-accrual loans with ACL	2,258	94
Current loans receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	16,784,935	16,123,987
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	1,771,528	1,704,544
Residential real estate | Accruing loans 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	414	5,342
Residential real estate | Accruing loans 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	3,082	729
Residential real estate | Accruing loans 90 days or more past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	364	107
Residential real estate | Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	6,260	8,740
Non-accrual loans with no ACL	2,400	2,562
Non-accrual loans with ACL	0	0
Residential real estate | Current loans receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	1,765,268	1,695,804
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	10,713,964	10,303,306
Commercial real estate | Accruing loans 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	5,600	18,134
Commercial real estate | Accruing loans 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	11,590	2,439
Commercial real estate | Accruing loans 90 days or more past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	2,644	2,161
Commercial real estate | Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	25,446	36,414
Non-accrual loans with no ACL	3,467	13,680
Non-accrual loans with ACL	2,145	0
Commercial real estate | Current loans receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	10,688,518	10,266,892
Other commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	3,066,028	2,901,863
Other commercial | Accruing loans 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	7,395	12,745
Other commercial | Accruing loans 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	12,409	774
Other commercial | Accruing loans 90 days or more past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	875	530
Other commercial | Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	22,631	15,925
Non-accrual loans with no ACL	1,952	1,869
Non-accrual loans with ACL	0	7
Other commercial | Current loans receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	3,043,397	2,885,938
Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	905,884	888,013
Home equity | Accruing loans 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	4,355	3,006
Home equity | Accruing loans 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	883	1,527
Home equity | Accruing loans 90 days or more past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	382	283
Home equity | Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	7,448	6,782
Non-accrual loans with no ACL	1,828	1,966
Non-accrual loans with ACL	0	0
Home equity | Current loans receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	898,436	881,231
Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	394,587	400,356
Other consumer | Accruing loans 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	3,214	4,228
Other consumer | Accruing loans 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	736	1,043
Other consumer | Accruing loans 90 days or more past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	427	231
Other consumer | Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	5,271	6,234
Non-accrual loans with no ACL	781	645
Non-accrual loans with ACL	113	87
Other consumer | Current loans receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	$ 389,316	$ 394,122