Loans Receivable, Net - Credit Quality Indicators for RRE and Consumer Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Credit Quality Indicators By Origination
Total	$ 14,399,755	$ 13,432,031
Residential real estate
Credit Quality Indicators By Origination
Term loans originated current fiscal year	290,234	427,814
Term loans originated fiscal year before current fiscal year	584,815	179,395
Term loans originated two years before current fiscal year	131,704	66,543
Term loans originated three years before current fiscal year	48,997	51,095
Term loans originated four years before current fiscal year	40,466	42,181
Term loans originated five years before current fiscal year	163,160	146,299
Revolving loans	1,743	138,556
Total	1,261,119	1,051,883
Residential real estate | Performing
Credit Quality Indicators By Origination
Term loans originated current fiscal year	290,234	427,318
Term loans originated fiscal year before current fiscal year	583,300	178,016
Term loans originated two years before current fiscal year	131,569	66,470
Term loans originated three years before current fiscal year	48,997	50,816
Term loans originated four years before current fiscal year	40,198	42,005
Term loans originated five years before current fiscal year	161,528	143,473
Revolving loans	1,743	138,556
Total	1,257,569	1,046,654
Residential real estate | 30-89 Days Past Due
Credit Quality Indicators By Origination
Term loans originated current fiscal year	0	496
Term loans originated fiscal year before current fiscal year	1,515	1,232
Term loans originated two years before current fiscal year	0	0
Term loans originated three years before current fiscal year	0	0
Term loans originated four years before current fiscal year	0	0
Term loans originated five years before current fiscal year	163	861
Revolving loans	0	0
Total	1,678	2,589
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
Term loans originated fiscal year before current fiscal year	0	147
Term loans originated two years before current fiscal year	135	73
Term loans originated three years before current fiscal year	0	279
Term loans originated four years before current fiscal year	268	176
Term loans originated five years before current fiscal year	1,469	1,965
Revolving loans	0	0
Total	1,872	2,640
Home equity
Credit Quality Indicators By Origination
Term loans originated current fiscal year	54	871
Term loans originated fiscal year before current fiscal year	38	303
Term loans originated two years before current fiscal year	60	1,293
Term loans originated three years before current fiscal year	263	1,329
Term loans originated four years before current fiscal year	643	886
Term loans originated five years before current fiscal year	8,759	11,494
Revolving loans	763,765	720,112
Total	773,582	736,288
Home equity | Performing
Credit Quality Indicators By Origination
Term loans originated current fiscal year	54	871
Term loans originated fiscal year before current fiscal year	38	303
Term loans originated two years before current fiscal year	60	1,260
Term loans originated three years before current fiscal year	231	1,328
Term loans originated four years before current fiscal year	643	886
Term loans originated five years before current fiscal year	8,461	10,589
Revolving loans	761,244	717,089
Total	770,731	732,326
Home equity | 30-89 Days Past Due
Credit Quality Indicators By Origination
Term loans originated current fiscal year	0	0
Term loans originated fiscal year before current fiscal year	0	0
Term loans originated two years before current fiscal year	0	0
Term loans originated three years before current fiscal year	0	0
Term loans originated four years before current fiscal year	0	0
Term loans originated five years before current fiscal year	25	576
Revolving loans	1,111	1,518
Total	1,136	2,094
Home equity | Non-Accrual and 90 Days or More Past Due
Credit Quality Indicators By Origination
Term loans originated current fiscal year	0	0
Term loans originated fiscal year before current fiscal year	0	0
Term loans originated two years before current fiscal year	0	33
Term loans originated three years before current fiscal year	32	1
Term loans originated four years before current fiscal year	0	0
Term loans originated five years before current fiscal year	273	329
Revolving loans	1,410	1,505
Total	1,715	1,868
Other consumer
Credit Quality Indicators By Origination
Term loans originated current fiscal year	89,945	151,407
Term loans originated fiscal year before current fiscal year	119,479	80,531
Term loans originated two years before current fiscal year	62,620	37,036
Term loans originated three years before current fiscal year	27,010	19,563
Term loans originated four years before current fiscal year	13,931	8,591
Term loans originated five years before current fiscal year	19,656	17,763
Revolving loans	36,951	33,948
Total	369,592	348,839
Other consumer | Performing
Credit Quality Indicators By Origination
Term loans originated current fiscal year	89,777	150,910
Term loans originated fiscal year before current fiscal year	118,899	80,072
Term loans originated two years before current fiscal year	62,420	36,647
Term loans originated three years before current fiscal year	26,635	19,268
Term loans originated four years before current fiscal year	13,675	8,506
Term loans originated five years before current fiscal year	18,015	15,968
Revolving loans	36,879	33,680
Total	366,300	345,051
Other consumer | 30-89 Days Past Due
Credit Quality Indicators By Origination
Term loans originated current fiscal year	168	469
Term loans originated fiscal year before current fiscal year	529	443
Term loans originated two years before current fiscal year	159	187
Term loans originated three years before current fiscal year	198	144
Term loans originated four years before current fiscal year	79	78
Term loans originated five years before current fiscal year	1,481	1,589
Revolving loans	59	257
Total	2,673	3,167
Other consumer | Non-Accrual and 90 Days or More Past Due
Credit Quality Indicators By Origination
Term loans originated current fiscal year	0	28
Term loans originated fiscal year before current fiscal year	51	16
Term loans originated two years before current fiscal year	41	202
Term loans originated three years before current fiscal year	177	151
Term loans originated four years before current fiscal year	177	7
Term loans originated five years before current fiscal year	160	206
Revolving loans	13	11
Total	$ 619	$ 621