Loans Receivable - Loan Delinquencies (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Loan payment delinquencies
Total loans receivable	$ 11,354,364	$ 11,414,809
90 days or greater delinquent and accruing	2,511	2,698
Total delinquency
Loan payment delinquencies
Total loans receivable	68,298	93,270
30-59 days delinquent
Loan payment delinquencies
Total loans receivable	23,435	54,413
60-89 days delinquent
Loan payment delinquencies
Total loans receivable	24,373	14,266
90 days or greater delinquent
Loan payment delinquencies
Total loans receivable	20,490	24,591
Current
Loan payment delinquencies
Total loans receivable	11,286,066	11,321,539
Personal Banking
Loan payment delinquencies
Total loans receivable	6,584,612	6,782,070
90 days or greater delinquent and accruing	2,002	2,463
Personal Banking | Total delinquency
Loan payment delinquencies
Total loans receivable	38,316	74,644
Personal Banking | 30-59 days delinquent
Loan payment delinquencies
Total loans receivable	14,759	47,013
Personal Banking | 60-89 days delinquent
Loan payment delinquencies
Total loans receivable	12,486	12,532
Personal Banking | 90 days or greater delinquent
Loan payment delinquencies
Total loans receivable	11,071	15,099
Personal Banking | Current
Loan payment delinquencies
Total loans receivable	6,546,296	6,707,426
Personal Banking | Residential mortgage loans
Loan payment delinquencies
Total loans receivable	3,324,068	3,428,185
90 days or greater delinquent and accruing	1,390	1,671
Personal Banking | Residential mortgage loans | Total delinquency
Loan payment delinquencies
Total loans receivable	14,392	45,832
Personal Banking | Residential mortgage loans | 30-59 days delinquent
Loan payment delinquencies
Total loans receivable	616	30,041
Personal Banking | Residential mortgage loans | 60-89 days delinquent
Loan payment delinquencies
Total loans receivable	8,223	7,796
Personal Banking | Residential mortgage loans | 90 days or greater delinquent
Loan payment delinquencies
Total loans receivable	5,553	7,995
Personal Banking | Residential mortgage loans | Current
Loan payment delinquencies
Total loans receivable	3,309,676	3,382,353
Personal Banking | Home equity loans
Loan payment delinquencies
Total loans receivable	1,180,486	1,227,858
90 days or greater delinquent and accruing	34	26
Personal Banking | Home equity loans | Total delinquency
Loan payment delinquencies
Total loans receivable	7,342	9,869
Personal Banking | Home equity loans | 30-59 days delinquent
Loan payment delinquencies
Total loans receivable	3,771	5,761
Personal Banking | Home equity loans | 60-89 days delinquent
Loan payment delinquencies
Total loans receivable	1,065	982
Personal Banking | Home equity loans | 90 days or greater delinquent
Loan payment delinquencies
Total loans receivable	2,506	3,126
Personal Banking | Home equity loans | Current
Loan payment delinquencies
Total loans receivable	1,173,144	1,217,989
Personal Banking | Vehicle loans
Loan payment delinquencies
Total loans receivable	1,960,928	2,008,601
90 days or greater delinquent and accruing	8	44
Personal Banking | Vehicle loans | Total delinquency
Loan payment delinquencies
Total loans receivable	14,724	16,759
Personal Banking | Vehicle loans | 30-59 days delinquent
Loan payment delinquencies
Total loans receivable	9,759	10,382
Personal Banking | Vehicle loans | 60-89 days delinquent
Loan payment delinquencies
Total loans receivable	2,774	3,326
Personal Banking | Vehicle loans | 90 days or greater delinquent
Loan payment delinquencies
Total loans receivable	2,191	3,051
Personal Banking | Vehicle loans | Current
Loan payment delinquencies
Total loans receivable	1,946,204	1,991,842
Personal Banking | Consumer loans
Loan payment delinquencies
Total loans receivable	119,130	117,426
90 days or greater delinquent and accruing	570	722
Personal Banking | Consumer loans | Total delinquency
Loan payment delinquencies
Total loans receivable	1,858	2,184
Personal Banking | Consumer loans | 30-59 days delinquent
Loan payment delinquencies
Total loans receivable	613	829
Personal Banking | Consumer loans | 60-89 days delinquent
Loan payment delinquencies
Total loans receivable	424	428
Personal Banking | Consumer loans | 90 days or greater delinquent
Loan payment delinquencies
Total loans receivable	821	927
Personal Banking | Consumer loans | Current
Loan payment delinquencies
Total loans receivable	117,272	115,242
Commercial Banking
Loan payment delinquencies
Total loans receivable	4,769,752	4,632,739
90 days or greater delinquent and accruing	509	235
Commercial Banking | Total delinquency
Loan payment delinquencies
Total loans receivable	29,982	18,626
Commercial Banking | 30-59 days delinquent
Loan payment delinquencies
Total loans receivable	8,676	7,400
Commercial Banking | 60-89 days delinquent
Loan payment delinquencies
Total loans receivable	11,887	1,734
Commercial Banking | 90 days or greater delinquent
Loan payment delinquencies
Total loans receivable	9,419	9,492
Commercial Banking | Current
Loan payment delinquencies
Total loans receivable	4,739,770	4,614,113
Commercial Banking | Commercial real estate loans
Loan payment delinquencies
Total loans receivable	2,665,016	2,628,457
90 days or greater delinquent and accruing	185	225
Commercial Banking | Commercial real estate loans | Total delinquency
Loan payment delinquencies
Total loans receivable	12,511	9,576
Commercial Banking | Commercial real estate loans | 30-59 days delinquent
Loan payment delinquencies
Total loans receivable	3,893	2,010
Commercial Banking | Commercial real estate loans | 60-89 days delinquent
Loan payment delinquencies
Total loans receivable	2,736	1,031
Commercial Banking | Commercial real estate loans | 90 days or greater delinquent
Loan payment delinquencies
Total loans receivable	5,882	6,535
Commercial Banking | Commercial real estate loans | Current
Loan payment delinquencies
Total loans receivable	2,652,505	2,618,881
Commercial Banking | Commercial real estate loans - owner occupied
Loan payment delinquencies
Total loans receivable	362,622	345,553
90 days or greater delinquent and accruing	0	0
Commercial Banking | Commercial real estate loans - owner occupied | Total delinquency
Loan payment delinquencies
Total loans receivable	988	1,371
Commercial Banking | Commercial real estate loans - owner occupied | 30-59 days delinquent
Loan payment delinquencies
Total loans receivable	417	1,194
Commercial Banking | Commercial real estate loans - owner occupied | 60-89 days delinquent
Loan payment delinquencies
Total loans receivable	419	0
Commercial Banking | Commercial real estate loans - owner occupied | 90 days or greater delinquent
Loan payment delinquencies
Total loans receivable	152	177
Commercial Banking | Commercial real estate loans - owner occupied | Current
Loan payment delinquencies
Total loans receivable	361,634	344,182
Commercial Banking | Commercial loans
Loan payment delinquencies
Total loans receivable	1,742,114	1,658,729
90 days or greater delinquent and accruing	324	10
Commercial Banking | Commercial loans | Total delinquency
Loan payment delinquencies
Total loans receivable	16,483	7,679
Commercial Banking | Commercial loans | 30-59 days delinquent
Loan payment delinquencies
Total loans receivable	4,366	4,196
Commercial Banking | Commercial loans | 60-89 days delinquent
Loan payment delinquencies
Total loans receivable	8,732	703
Commercial Banking | Commercial loans | 90 days or greater delinquent
Loan payment delinquencies
Total loans receivable	3,385	2,780
Commercial Banking | Commercial loans | Current
Loan payment delinquencies
Total loans receivable	$ 1,725,631	$ 1,651,050