Loans Receivable - Changes in the Allowance for Losses on Loans Receivable (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Changes in allowance for losses on allocated loans receivable
Beginning balance	$ 122,809	$ 124,897	$ 116,819	$ 125,243	$ 125,243
Current period provision	11,456	2,169	19,712	6,403
Charge-offs	(7,907)	(4,869)	(13,260)	(11,528)
Recoveries	2,801	2,873	5,888	4,952
Ending balance	129,159	125,070	129,159	125,070	116,819
Off-Balance Sheet Exposure
Changes in allowance for losses on allocated loans receivable
Beginning balance	13,604	16,324	13,949	17,123	17,123
Current period provision	(2,712)	(2,539)	(3,057)	(3,338)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance	10,892	13,785	10,892	13,785	13,949
Personal Banking
Changes in allowance for losses on allocated loans receivable
Beginning balance	42,351	44,668	43,464	51,706	51,706
Current period provision	169	(453)	2,502	(3,552)
Charge-offs	(4,017)	(3,050)	(8,683)	(8,197)
Recoveries	1,302	2,076	2,522	3,284
Ending balance	39,805	43,241	39,805	43,241	43,464
Personal Banking | Off-Balance Sheet Exposure
Changes in allowance for losses on allocated loans receivable
Beginning balance	61	65	62	67	67
Current period provision	4	(1)	3	(3)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance	65	64	65	64	62
Personal Banking | Residential mortgage loans
Changes in allowance for losses on allocated loans receivable
Beginning balance	13,275	16,821	14,347	18,193	18,193
Current period provision	(1,079)	(2,375)	(1,672)	(3,774)
Charge-offs	(273)	(252)	(861)	(414)	(845)
Recoveries	166	805	275	994
Ending balance	12,089	14,999	12,089	14,999	14,347
Personal Banking | Residential mortgage loans | Off-Balance Sheet Exposure
Changes in allowance for losses on allocated loans receivable
Beginning balance		1		2	2
Current period provision		0		(1)
Charge-offs		0		0
Recoveries		0		0
Ending balance		1		1
Personal Banking | Home equity loans
Changes in allowance for losses on allocated loans receivable
Beginning balance	4,624	5,334	4,845	5,403	5,403
Current period provision	(228)	(279)	(378)	(134)
Charge-offs	(413)	(237)	(686)	(649)	(1,736)
Recoveries	233	392	435	590
Ending balance	4,216	5,210	4,216	5,210	4,845
Personal Banking | Home equity loans | Off-Balance Sheet Exposure
Changes in allowance for losses on allocated loans receivable
Beginning balance	61	64	62	65	65
Current period provision	4	(1)	3	(2)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance	65	63	65	63	62
Personal Banking | Vehicle loans
Changes in allowance for losses on allocated loans receivable
Beginning balance	22,455	21,061	22,389	26,911	26,911
Current period provision	448	1,767	2,263	(1,927)
Charge-offs	(2,150)	(1,926)	(4,451)	(4,514)	(8,809)
Recoveries	481	462	1,033	894
Ending balance	21,234	21,364	21,234	21,364	22,389
Personal Banking | Consumer loans
Changes in allowance for losses on allocated loans receivable
Beginning balance	1,997	1,452	1,883	1,199	1,199
Current period provision	1,028	434	2,289	2,283
Charge-offs	(1,181)	(635)	(2,685)	(2,620)	(5,929)
Recoveries	422	417	779	806
Ending balance	2,266	1,668	2,266	1,668	1,883
Commercial Banking
Changes in allowance for losses on allocated loans receivable
Beginning balance	80,458	80,229	73,355	73,537	73,537
Current period provision	11,287	2,622	17,210	9,955
Charge-offs	(3,890)	(1,819)	(4,577)	(3,331)
Recoveries	1,499	797	3,366	1,668
Ending balance	89,354	81,829	89,354	81,829	73,355
Commercial Banking | Off-Balance Sheet Exposure
Changes in allowance for losses on allocated loans receivable
Beginning balance	13,543	16,259	13,887	17,056	17,056
Current period provision	(2,716)	(2,538)	(3,060)	(3,335)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance	10,827	13,721	10,827	13,721	13,887
Commercial Banking | Commercial real estate loans
Changes in allowance for losses on allocated loans receivable
Beginning balance	45,583	54,474	44,328	51,267	51,267
Current period provision	7,432	(3,785)	7,281	(712)
Charge-offs	(293)	(500)	(409)	(849)	(15,321)
Recoveries	902	370	2,424	853
Ending balance	53,624	50,559	53,624	50,559	44,328
Commercial Banking | Commercial real estate loans | Off-Balance Sheet Exposure
Changes in allowance for losses on allocated loans receivable
Beginning balance	2,956	6,218	4,154	6,147	6,147
Current period provision	(1,059)	(1,768)	(2,257)	(1,697)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance	1,897	4,450	1,897	4,450	4,154
Commercial Banking | Commercial real estate loans - owner occupied
Changes in allowance for losses on allocated loans receivable
Beginning balance	4,187	4,055	3,882	3,775	3,775
Current period provision	(130)	(453)	168	(181)
Charge-offs	0	0	0	0	0
Recoveries	73	13	80	21
Ending balance	4,130	3,615	4,130	3,615	3,882
Commercial Banking | Commercial real estate loans - owner occupied | Off-Balance Sheet Exposure
Changes in allowance for losses on allocated loans receivable
Beginning balance	136	154	160	173	173
Current period provision	124	(3)	100	(22)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance	260	151	260	151	160
Commercial Banking | Commercial loans
Changes in allowance for losses on allocated loans receivable
Beginning balance	30,688	21,700	25,145	18,495	18,495
Current period provision	3,985	6,860	9,761	10,848
Charge-offs	(3,597)	(1,319)	(4,168)	(2,482)	(14,462)
Recoveries	524	414	862	794
Ending balance	31,600	27,655	31,600	27,655	25,145
Commercial Banking | Commercial loans | Off-Balance Sheet Exposure
Changes in allowance for losses on allocated loans receivable
Beginning balance	10,451	9,887	9,573	10,736	10,736
Current period provision	(1,781)	(767)	(903)	(1,616)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance	$ 8,670	$ 9,120	$ 8,670	$ 9,120	$ 9,573