Loans Receivable, Net - Aging Analysis (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	$ 14,851,233	$ 13,432,031
Accruing loans 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	7,095	38,081
Accruing loans 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	3,827	12,485
Accruing loans 90 days or more past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	2,524	17,141
Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	45,939	118,239
Non-accrual loans with no ACL	32,361	28,961
Non-accrual loans with ACL	132	21,571
Current loans receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	14,805,294	13,313,792
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	1,368,368	1,051,883
Residential real estate | Accruing loans 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	427	2,132
Residential real estate | Accruing loans 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	245	457
Residential real estate | Accruing loans 90 days or more past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	98	223
Residential real estate | Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	2,579	5,229
Non-accrual loans with no ACL	1,809	2,162
Non-accrual loans with ACL	0	255
Residential real estate | Current loans receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	1,365,789	1,046,654
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	9,582,989	8,630,831
Commercial real estate | Accruing loans 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	1,967	26,063
Commercial real estate | Accruing loans 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	2,556	9,537
Commercial real estate | Accruing loans 90 days or more past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	1,406	15,345
Commercial real estate | Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	30,747	71,433
Non-accrual loans with no ACL	24,818	20,040
Non-accrual loans with ACL	0	448
Commercial real estate | Current loans receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	9,552,242	8,559,398
Other commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	2,729,717	2,664,190
Other commercial | Accruing loans 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	1,794	5,464
Other commercial | Accruing loans 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	423	1,652
Other commercial | Accruing loans 90 days or more past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	441	1,383
Other commercial | Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	6,812	33,827
Non-accrual loans with no ACL	4,051	4,563
Non-accrual loans with ACL	103	20,765
Other commercial | Current loans receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	2,722,905	2,630,363
Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	793,556	736,288
Home equity | Accruing loans 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	776	1,582
Home equity | Accruing loans 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	170	512
Home equity | Accruing loans 90 days or more past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	339	57
Home equity | Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	2,489	3,962
Non-accrual loans with no ACL	1,204	1,712
Non-accrual loans with ACL	0	99
Home equity | Current loans receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	791,067	732,326
Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	376,603	348,839
Other consumer | Accruing loans 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	2,131	2,840
Other consumer | Accruing loans 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	433	327
Other consumer | Accruing loans 90 days or more past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	240	133
Other consumer | Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	3,312	3,788
Non-accrual loans with no ACL	479	484
Non-accrual loans with ACL	29	4
Other consumer | Current loans receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	$ 373,291	$ 345,051