Loans Receivable, Net - Collateral-Dependent Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	$ 16,198,082	$ 15,246,812
Residential Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	1,704,544	1,446,008
Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	10,303,306	9,797,047
Other Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	2,901,863	2,799,668
Home Equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	888,013	822,232
Other Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	400,356	381,857
Collateral Pledged
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	43,044	42,513
Collateral Pledged | Residential Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	11,134	2,456
Collateral Pledged | Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	24,921	33,355
Collateral Pledged | Other Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	3,963	4,288
Collateral Pledged | Home Equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	1,993	1,276
Collateral Pledged | Other Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	1,033	1,138
Business assets
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	3,236	3,172
Business assets | Residential Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	0	0
Business assets | Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	6	32
Business assets | Other Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	3,230	3,140
Business assets | Home Equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	0	0
Business assets | Other Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	0	0
Residential Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	17,578	5,061
Residential Real Estate | Residential Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	11,099	2,407
Residential Real Estate | Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	4,317	990
Residential Real Estate | Other Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	98	318
Residential Real Estate | Home Equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	1,968	1,201
Residential Real Estate | Other Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	96	145
Other real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	21,635	33,125
Other real estate | Residential Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	35	49
Other real estate | Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	20,598	32,333
Other real estate | Other Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	620	300
Other real estate | Home Equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	25	75
Other real estate | Other Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	357	368
Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	595	1,155
Other | Residential Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	0	0
Other | Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	0	0
Other | Other Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	15	530
Other | Home Equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	0	0
Other | Other Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	$ 580	$ 625