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Loans Receivable - Summary of Originated and Acquired Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross $ 11,310,273   $ 10,920,452      
Allowance for credit losses (124,841) $ (124,423) (118,036) $ (109,819) $ (98,355) $ (102,241)
Total loans receivable, net 11,185,432   10,802,416      
Loans held-for-sale 10,592   9,913      
Unearned income, unamortized premiums and discounts and deferred fees and costs 71,500   76,100      
Personal Banking            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 6,886,647   6,964,928      
Allowance for credit losses (50,562) (50,851) (48,887) (41,244) (37,907) (31,040)
Personal Banking | Residential mortgage loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 3,472,763   3,498,599      
Allowance for credit losses (17,090) (17,556) (19,261) (17,967) (16,158) (7,373)
Loans held-for-sale 10,200   9,900      
Personal Banking | Home equity loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 1,258,765   1,297,674      
Allowance for credit losses (5,044) (5,002) (5,902) (5,448) (5,232) (5,300)
Personal Banking | Vehicle loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 2,039,699   2,056,783      
Allowance for credit losses (27,226) (27,283) (23,059) (17,004) (15,738) (15,483)
Personal Banking | Consumer loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 115,420   111,872      
Allowance for credit losses (1,202) (1,010) (665) (825) (779) (2,884)
Commercial Banking            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 4,423,626   3,955,524      
Allowance for credit losses (74,279) (73,572) (69,149) (68,575) (60,448) (71,201)
Commercial Banking | Commercial real estate loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 2,553,644   2,448,028      
Allowance for credit losses (48,582) (50,056) (44,506) (49,649) (39,641) (54,141)
Loans held-for-sale 435   0      
Commercial Banking | Commercial real estate loans - owner occupied            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 369,373   375,527      
Allowance for credit losses (3,479) (3,498) (4,004) (4,087) (4,095) (3,883)
Commercial Banking | Commercial loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 1,500,609   1,131,969      
Allowance for credit losses (22,218) $ (20,018) (20,639) $ (14,839) $ (16,712) $ (13,177)
Originated            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 10,620,595   10,089,414      
Allowance for credit losses (116,596)   (107,379)      
Total loans receivable, net 10,503,999   9,982,035      
Originated | Personal Banking            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 6,527,159   6,529,189      
Originated | Personal Banking | Residential mortgage loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 3,322,136   3,327,879      
Originated | Personal Banking | Home equity loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 1,126,675   1,131,641      
Originated | Personal Banking | Vehicle loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 1,969,029   1,965,385      
Originated | Personal Banking | Consumer loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 109,319   104,284      
Originated | Commercial Banking            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 4,093,436   3,560,225      
Originated | Commercial Banking | Commercial real estate loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 2,286,563   2,135,607      
Originated | Commercial Banking | Commercial real estate loans - owner occupied            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 343,714   341,704      
Originated | Commercial Banking | Commercial loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 1,463,159   1,082,914      
Acquired            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 689,678   831,038      
Allowance for credit losses (8,245)   (10,657)      
Total loans receivable, net 681,433   820,381      
Acquired | Personal Banking            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 359,488   435,739      
Acquired | Personal Banking | Residential mortgage loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 150,627   170,720      
Acquired | Personal Banking | Home equity loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 132,090   166,033      
Acquired | Personal Banking | Vehicle loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 70,670   91,398      
Acquired | Personal Banking | Consumer loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 6,101   7,588      
Acquired | Commercial Banking            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 330,190   395,299      
Acquired | Commercial Banking | Commercial real estate loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 267,081   312,421      
Acquired | Commercial Banking | Commercial real estate loans - owner occupied            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross 25,659   33,823      
Acquired | Commercial Banking | Commercial loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable, gross $ 37,450   $ 49,055