Loans Receivable, Net - Aging Analysis (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Loan portfolio aging analysis
Loans receivable	$ 16,198,082	$ 15,246,812
Accruing loans 30-59 days past due
Loan portfolio aging analysis
Loans receivable	43,455	16,331
Accruing loans 60-89 days past due
Loan portfolio aging analysis
Loans receivable	6,512	4,636
Accruing loans 90 days or more past due
Loan portfolio aging analysis
Loans receivable	3,312	1,559
Financial Asset, Past Due
Loan portfolio aging analysis
Loans receivable	74,095	53,677
Non-accrual loans with no ACL	20,722	31,036
Non-accrual loans with ACL	94	115
Current
Loan portfolio aging analysis
Loans receivable	16,123,987	15,193,135
Residential Real Estate
Loan portfolio aging analysis
Loans receivable	1,704,544	1,446,008
Residential Real Estate | Accruing loans 30-59 days past due
Loan portfolio aging analysis
Loans receivable	5,342	2,796
Residential Real Estate | Accruing loans 60-89 days past due
Loan portfolio aging analysis
Loans receivable	729	142
Residential Real Estate | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Loans receivable	107	215
Residential Real Estate | Financial Asset, Past Due
Loan portfolio aging analysis
Loans receivable	8,740	5,389
Non-accrual loans with no ACL	2,562	2,236
Non-accrual loans with ACL	0	0
Residential Real Estate | Current
Loan portfolio aging analysis
Loans receivable	1,695,804	1,440,619
Commercial Real Estate
Loan portfolio aging analysis
Loans receivable	10,303,306	9,797,047
Commercial Real Estate | Accruing loans 30-59 days past due
Loan portfolio aging analysis
Loans receivable	18,134	5,462
Commercial Real Estate | Accruing loans 60-89 days past due
Loan portfolio aging analysis
Loans receivable	2,439	2,865
Commercial Real Estate | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Loans receivable	2,161	472
Commercial Real Estate | Financial Asset, Past Due
Loan portfolio aging analysis
Loans receivable	36,414	31,742
Non-accrual loans with no ACL	13,680	22,943
Non-accrual loans with ACL	0	0
Commercial Real Estate | Current
Loan portfolio aging analysis
Loans receivable	10,266,892	9,765,305
Other Commercial
Loan portfolio aging analysis
Loans receivable	2,901,863	2,799,668
Other Commercial | Accruing loans 30-59 days past due
Loan portfolio aging analysis
Loans receivable	12,745	4,192
Other Commercial | Accruing loans 60-89 days past due
Loan portfolio aging analysis
Loans receivable	774	297
Other Commercial | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Loans receivable	530	542
Other Commercial | Financial Asset, Past Due
Loan portfolio aging analysis
Loans receivable	15,925	8,877
Non-accrual loans with no ACL	1,869	3,790
Non-accrual loans with ACL	7	56
Other Commercial | Current
Loan portfolio aging analysis
Loans receivable	2,885,938	2,790,791
Home Equity
Loan portfolio aging analysis
Loans receivable	888,013	822,232
Home Equity | Accruing loans 30-59 days past due
Loan portfolio aging analysis
Loans receivable	3,006	754
Home Equity | Accruing loans 60-89 days past due
Loan portfolio aging analysis
Loans receivable	1,527	529
Home Equity | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Loans receivable	283	138
Home Equity | Financial Asset, Past Due
Loan portfolio aging analysis
Loans receivable	6,782	2,655
Non-accrual loans with no ACL	1,966	1,234
Non-accrual loans with ACL	0	0
Home Equity | Current
Loan portfolio aging analysis
Loans receivable	881,231	819,577
Other Consumer
Loan portfolio aging analysis
Loans receivable	400,356	381,857
Other Consumer | Accruing loans 30-59 days past due
Loan portfolio aging analysis
Loans receivable	4,228	3,127
Other Consumer | Accruing loans 60-89 days past due
Loan portfolio aging analysis
Loans receivable	1,043	803
Other Consumer | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Loans receivable	231	192
Other Consumer | Financial Asset, Past Due
Loan portfolio aging analysis
Loans receivable	6,234	5,014
Non-accrual loans with no ACL	645	833
Non-accrual loans with ACL	87	59
Other Consumer | Current
Loan portfolio aging analysis
Loans receivable	$ 394,122	$ 376,843