Loans Receivable, Net - Aging Analysis (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Loan portfolio aging analysis
Loans receivable	$ 17,261,849	$ 16,198,082
Accruing loans 30-59 days past due
Loan portfolio aging analysis
Loans receivable	25,347	43,455
Accruing loans 60-89 days past due
Loan portfolio aging analysis
Loans receivable	6,881	6,512
Accruing loans 90 days or more past due
Loan portfolio aging analysis
Loans receivable	6,177	3,312
Financial Asset, Past Due
Loan portfolio aging analysis
Loans receivable	58,850	74,095
Non-accrual loans with no ACL	20,060	20,722
Non-accrual loans with ACL	385	94
Current
Loan portfolio aging analysis
Loans receivable	17,202,999	16,123,987
Residential Real Estate
Loan portfolio aging analysis
Loans receivable	1,858,929	1,704,544
Residential Real Estate | Accruing loans 30-59 days past due
Loan portfolio aging analysis
Loans receivable	5,195	5,342
Residential Real Estate | Accruing loans 60-89 days past due
Loan portfolio aging analysis
Loans receivable	404	729
Residential Real Estate | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Loans receivable	1,509	107
Residential Real Estate | Financial Asset, Past Due
Loan portfolio aging analysis
Loans receivable	14,033	8,740
Non-accrual loans with no ACL	6,850	2,562
Non-accrual loans with ACL	75	0
Residential Real Estate | Current
Loan portfolio aging analysis
Loans receivable	1,844,896	1,695,804
Commercial Real Estate
Loan portfolio aging analysis
Loans receivable	10,963,713	10,303,306
Commercial Real Estate | Accruing loans 30-59 days past due
Loan portfolio aging analysis
Loans receivable	8,852	18,134
Commercial Real Estate | Accruing loans 60-89 days past due
Loan portfolio aging analysis
Loans receivable	2,792	2,439
Commercial Real Estate | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Loans receivable	2,899	2,161
Commercial Real Estate | Financial Asset, Past Due
Loan portfolio aging analysis
Loans receivable	22,555	36,414
Non-accrual loans with no ACL	8,012	13,680
Non-accrual loans with ACL	0	0
Commercial Real Estate | Current
Loan portfolio aging analysis
Loans receivable	10,941,158	10,266,892
Other Commercial
Loan portfolio aging analysis
Loans receivable	3,119,535	2,901,863
Other Commercial | Accruing loans 30-59 days past due
Loan portfolio aging analysis
Loans receivable	6,261	12,745
Other Commercial | Accruing loans 60-89 days past due
Loan portfolio aging analysis
Loans receivable	1,180	774
Other Commercial | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Loans receivable	985	530
Other Commercial | Financial Asset, Past Due
Loan portfolio aging analysis
Loans receivable	10,284	15,925
Non-accrual loans with no ACL	1,691	1,869
Non-accrual loans with ACL	167	7
Other Commercial | Current
Loan portfolio aging analysis
Loans receivable	3,109,251	2,885,938
Home Equity
Loan portfolio aging analysis
Loans receivable	930,994	888,013
Home Equity | Accruing loans 30-59 days past due
Loan portfolio aging analysis
Loans receivable	1,965	3,006
Home Equity | Accruing loans 60-89 days past due
Loan portfolio aging analysis
Loans receivable	1,699	1,527
Home Equity | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Loans receivable	646	283
Home Equity | Financial Asset, Past Due
Loan portfolio aging analysis
Loans receivable	7,136	6,782
Non-accrual loans with no ACL	2,826	1,966
Non-accrual loans with ACL	0	0
Home Equity | Current
Loan portfolio aging analysis
Loans receivable	923,858	881,231
Other Consumer
Loan portfolio aging analysis
Loans receivable	388,678	400,356
Other Consumer | Accruing loans 30-59 days past due
Loan portfolio aging analysis
Loans receivable	3,074	4,228
Other Consumer | Accruing loans 60-89 days past due
Loan portfolio aging analysis
Loans receivable	806	1,043
Other Consumer | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Loans receivable	138	231
Other Consumer | Financial Asset, Past Due
Loan portfolio aging analysis
Loans receivable	4,842	6,234
Non-accrual loans with no ACL	681	645
Non-accrual loans with ACL	143	87
Other Consumer | Current
Loan portfolio aging analysis
Loans receivable	$ 383,836	$ 394,122