Loans Receivable, Net - Credit Quality Indicators for RRE and Consumer Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Credit Quality Indicators By Origination
Gross Charge-Offs	$ 4,135	$ 3,790	$ 8,430	$ 7,083
Total	16,851,991		16,851,991		$ 16,198,082
Residential real estate
Credit Quality Indicators By Origination
Gross Charge-Offs, originated current fiscal year			0		0
Gross Charge-Offs, originated fiscal year before current fiscal year			0		5
Gross Charge-Offs, originated two years before current fiscal year			0		0
Gross Charge-Offs, originated three years before current fiscal year			0		0
Gross Charge-Offs, originated four years before current fiscal year			0		0
Gross Charge-Offs, Prior			0		15
Gross Charge-Offs, Revolving loans			0		0
Gross Charge-Offs	0	15	0	20	20
Term loans originated current fiscal year	62,011		62,011		234,568
Term loans originated fiscal year before current fiscal year	287,522		287,522		673,782
Term loans originated two years before current fiscal year	668,416		668,416		495,645
Term loans originated three years before current fiscal year	472,164		472,164		99,199
Term loans originated four years before current fiscal year	95,183		95,183		42,054
Term loans originated five years before current fiscal year	186,172		186,172		158,828
Revolving loans	60		60		468
Total	1,771,528		1,771,528		1,704,544
Residential real estate | Performing
Credit Quality Indicators By Origination
Term loans originated current fiscal year	61,830		61,830		233,753
Term loans originated fiscal year before current fiscal year	287,294		287,294		671,196
Term loans originated two years before current fiscal year	666,781		666,781		495,645
Term loans originated three years before current fiscal year	471,137		471,137		99,199
Term loans originated four years before current fiscal year	95,183		95,183		42,054
Term loans originated five years before current fiscal year	182,983		182,983		153,489
Revolving loans	60		60		468
Total	1,765,268		1,765,268		1,695,804
Residential real estate | 30-89 Days Past Due
Credit Quality Indicators By Origination
Term loans originated current fiscal year	181		181		815
Term loans originated fiscal year before current fiscal year	228		228		2,586
Term loans originated two years before current fiscal year	1,295		1,295		0
Term loans originated three years before current fiscal year	1,027		1,027		0
Term loans originated four years before current fiscal year	0		0		0
Term loans originated five years before current fiscal year	765		765		2,670
Revolving loans	0		0		0
Total	3,496		3,496		6,071
Residential real estate | Non-Accrual and 90 Days or More Past Due
Credit Quality Indicators By Origination
Term loans originated current fiscal year	0		0		0
Term loans originated fiscal year before current fiscal year	0		0		0
Term loans originated two years before current fiscal year	340		340		0
Term loans originated three years before current fiscal year	0		0		0
Term loans originated four years before current fiscal year	0		0		0
Term loans originated five years before current fiscal year	2,424		2,424		2,669
Revolving loans	0		0		0
Total	2,764		2,764		2,669
Home equity
Credit Quality Indicators By Origination
Gross Charge-Offs, originated current fiscal year			0		0
Gross Charge-Offs, originated fiscal year before current fiscal year			15		0
Gross Charge-Offs, originated two years before current fiscal year			0		48
Gross Charge-Offs, originated three years before current fiscal year			0		50
Gross Charge-Offs, originated four years before current fiscal year			0		0
Gross Charge-Offs, Prior			10		31
Gross Charge-Offs, Revolving loans			0		0
Gross Charge-Offs	0	98	25	102	129
Term loans originated current fiscal year	0		0		0
Term loans originated fiscal year before current fiscal year	145		145		20
Term loans originated two years before current fiscal year	0		0		0
Term loans originated three years before current fiscal year	132		132		21
Term loans originated four years before current fiscal year	0		0		178
Term loans originated five years before current fiscal year	4,796		4,796		5,492
Revolving loans	900,811		900,811		882,302
Total	905,884		905,884		888,013
Home equity | Performing
Credit Quality Indicators By Origination
Term loans originated current fiscal year	0		0		0
Term loans originated fiscal year before current fiscal year	145		145		20
Term loans originated two years before current fiscal year	0		0		0
Term loans originated three years before current fiscal year	132		132		21
Term loans originated four years before current fiscal year	0		0		178
Term loans originated five years before current fiscal year	4,720		4,720		5,277
Revolving loans	893,439		893,439		875,735
Total	898,436		898,436		881,231
Home equity | 30-89 Days Past Due
Credit Quality Indicators By Origination
Term loans originated current fiscal year	0		0		0
Term loans originated fiscal year before current fiscal year	0		0		0
Term loans originated two years before current fiscal year	0		0		0
Term loans originated three years before current fiscal year	0		0		0
Term loans originated four years before current fiscal year	0		0		0
Term loans originated five years before current fiscal year	0		0		11
Revolving loans	5,238		5,238		4,522
Total	5,238		5,238		4,533
Home equity | Non-Accrual and 90 Days or More Past Due
Credit Quality Indicators By Origination
Term loans originated current fiscal year	0		0		0
Term loans originated fiscal year before current fiscal year	0		0		0
Term loans originated two years before current fiscal year	0		0		0
Term loans originated three years before current fiscal year	0		0		0
Term loans originated four years before current fiscal year	0		0		0
Term loans originated five years before current fiscal year	76		76		204
Revolving loans	2,134		2,134		2,045
Total	2,210		2,210		2,249
Other consumer
Credit Quality Indicators By Origination
Gross Charge-Offs, originated current fiscal year			3,946		7,801
Gross Charge-Offs, originated fiscal year before current fiscal year			220		715
Gross Charge-Offs, originated two years before current fiscal year			263		170
Gross Charge-Offs, originated three years before current fiscal year			95		85
Gross Charge-Offs, originated four years before current fiscal year			24		73
Gross Charge-Offs, Prior			69		131
Gross Charge-Offs, Revolving loans			0		0
Gross Charge-Offs	2,279	$ 2,139	4,617	$ 4,304	8,975
Term loans originated current fiscal year	68,155		68,155		139,295
Term loans originated fiscal year before current fiscal year	109,883		109,883		98,630
Term loans originated two years before current fiscal year	79,214		79,214		62,961
Term loans originated three years before current fiscal year	50,932		50,932		29,143
Term loans originated four years before current fiscal year	22,344		22,344		12,335
Term loans originated five years before current fiscal year	24,110		24,110		17,314
Revolving loans	39,949		39,949		40,678
Total	394,587		394,587		400,356
Other consumer | Performing
Credit Quality Indicators By Origination
Term loans originated current fiscal year	66,630		66,630		137,035
Term loans originated fiscal year before current fiscal year	109,185		109,185		97,536
Term loans originated two years before current fiscal year	78,070		78,070		62,107
Term loans originated three years before current fiscal year	50,101		50,101		29,012
Term loans originated four years before current fiscal year	22,243		22,243		12,279
Term loans originated five years before current fiscal year	23,650		23,650		16,664
Revolving loans	39,437		39,437		39,489
Total	389,316		389,316		394,122
Other consumer | 30-89 Days Past Due
Credit Quality Indicators By Origination
Term loans originated current fiscal year	1,512		1,512		2,079
Term loans originated fiscal year before current fiscal year	544		544		870
Term loans originated two years before current fiscal year	894		894		805
Term loans originated three years before current fiscal year	345		345		119
Term loans originated four years before current fiscal year	53		53		43
Term loans originated five years before current fiscal year	93		93		173
Revolving loans	509		509		1,182
Total	3,950		3,950		5,271
Other consumer | Non-Accrual and 90 Days or More Past Due
Credit Quality Indicators By Origination
Term loans originated current fiscal year	13		13		181
Term loans originated fiscal year before current fiscal year	154		154		224
Term loans originated two years before current fiscal year	250		250		49
Term loans originated three years before current fiscal year	486		486		12
Term loans originated four years before current fiscal year	48		48		13
Term loans originated five years before current fiscal year	367		367		477
Revolving loans	3		3		7
Total	$ 1,321		$ 1,321		$ 963