Loans Receivable, Net - Aging Analysis (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Loan portfolio aging analysis
Loans receivable	$ 15,246,812	$ 13,432,031
Accruing loans 30-59 days past due
Loan portfolio aging analysis
Loans receivable	16,331	38,081
Accruing loans 60-89 days past due
Loan portfolio aging analysis
Loans receivable	4,636	12,485
Accruing loans 90 days or more past due
Loan portfolio aging analysis
Loans receivable	1,559	17,141
Financial Asset, Past Due
Loan portfolio aging analysis
Loans receivable	53,677	118,239
Non-accrual loans with no ACL	31,036	28,961
Non-accrual loans with ACL	115	21,571
Financial Asset, Not Past Due
Loan portfolio aging analysis
Loans receivable	15,193,135	13,313,792
Residential Real Estate
Loan portfolio aging analysis
Loans receivable	1,446,008	1,051,883
Residential Real Estate | Accruing loans 30-59 days past due
Loan portfolio aging analysis
Loans receivable	2,796	2,132
Residential Real Estate | Accruing loans 60-89 days past due
Loan portfolio aging analysis
Loans receivable	142	457
Residential Real Estate | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Loans receivable	215	223
Residential Real Estate | Financial Asset, Past Due
Loan portfolio aging analysis
Loans receivable	5,389	5,229
Non-accrual loans with no ACL	2,236	2,162
Non-accrual loans with ACL	0	255
Residential Real Estate | Financial Asset, Not Past Due
Loan portfolio aging analysis
Loans receivable	1,440,619	1,046,654
Commercial Real Estate
Loan portfolio aging analysis
Loans receivable	9,797,047	8,630,831
Commercial Real Estate | Accruing loans 30-59 days past due
Loan portfolio aging analysis
Loans receivable	5,462	26,063
Commercial Real Estate | Accruing loans 60-89 days past due
Loan portfolio aging analysis
Loans receivable	2,865	9,537
Commercial Real Estate | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Loans receivable	472	15,345
Commercial Real Estate | Financial Asset, Past Due
Loan portfolio aging analysis
Loans receivable	31,742	71,433
Non-accrual loans with no ACL	22,943	20,040
Non-accrual loans with ACL	0	448
Commercial Real Estate | Financial Asset, Not Past Due
Loan portfolio aging analysis
Loans receivable	9,765,305	8,559,398
Other Commercial
Loan portfolio aging analysis
Loans receivable	2,799,668	2,664,190
Other Commercial | Accruing loans 30-59 days past due
Loan portfolio aging analysis
Loans receivable	4,192	5,464
Other Commercial | Accruing loans 60-89 days past due
Loan portfolio aging analysis
Loans receivable	297	1,652
Other Commercial | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Loans receivable	542	1,383
Other Commercial | Financial Asset, Past Due
Loan portfolio aging analysis
Loans receivable	8,877	33,827
Non-accrual loans with no ACL	3,790	4,563
Non-accrual loans with ACL	56	20,765
Other Commercial | Financial Asset, Not Past Due
Loan portfolio aging analysis
Loans receivable	2,790,791	2,630,363
Home Equity
Loan portfolio aging analysis
Loans receivable	822,232	736,288
Home Equity | Accruing loans 30-59 days past due
Loan portfolio aging analysis
Loans receivable	754	1,582
Home Equity | Accruing loans 60-89 days past due
Loan portfolio aging analysis
Loans receivable	529	512
Home Equity | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Loans receivable	138	57
Home Equity | Financial Asset, Past Due
Loan portfolio aging analysis
Loans receivable	2,655	3,962
Non-accrual loans with no ACL	1,234	1,712
Non-accrual loans with ACL	0	99
Home Equity | Financial Asset, Not Past Due
Loan portfolio aging analysis
Loans receivable	819,577	732,326
Other Consumer
Loan portfolio aging analysis
Loans receivable	381,857	348,839
Other Consumer | Accruing loans 30-59 days past due
Loan portfolio aging analysis
Loans receivable	3,127	2,840
Other Consumer | Accruing loans 60-89 days past due
Loan portfolio aging analysis
Loans receivable	803	327
Other Consumer | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Loans receivable	192	133
Other Consumer | Financial Asset, Past Due
Loan portfolio aging analysis
Loans receivable	5,014	3,788
Non-accrual loans with no ACL	833	484
Non-accrual loans with ACL	59	4
Other Consumer | Financial Asset, Not Past Due
Loan portfolio aging analysis
Loans receivable	$ 376,843	$ 345,051