Loans Receivable, Net - Credit Quality Indicators for RRE and Consumer Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Credit Quality Indicators By Origination
Total	$ 14,851,233	$ 13,432,031
Residential real estate
Credit Quality Indicators By Origination
Term loans originated current fiscal year	428,697	427,814
Term loans originated fiscal year before current fiscal year	576,673	179,395
Term loans originated two years before current fiscal year	122,837	66,543
Term loans originated three years before current fiscal year	46,202	51,095
Term loans originated four years before current fiscal year	37,682	42,181
Term loans originated five years before current fiscal year	154,723	146,299
Revolving loans	1,554	138,556
Total	1,368,368	1,051,883
Residential real estate | Performing
Credit Quality Indicators By Origination
Term loans originated current fiscal year	428,697	427,318
Term loans originated fiscal year before current fiscal year	576,245	178,016
Term loans originated two years before current fiscal year	122,596	66,470
Term loans originated three years before current fiscal year	46,202	50,816
Term loans originated four years before current fiscal year	37,417	42,005
Term loans originated five years before current fiscal year	153,078	143,473
Revolving loans	1,554	138,556
Total	1,365,789	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	428	1,232
Term loans originated two years before current fiscal year	108	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	136	861
Revolving loans	0	0
Total	672	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	133	73
Term loans originated three years before current fiscal year	0	279
Term loans originated four years before current fiscal year	265	176
Term loans originated five years before current fiscal year	1,509	1,965
Revolving loans	0	0
Total	1,907	2,640
Home equity
Credit Quality Indicators By Origination
Term loans originated current fiscal year	61	871
Term loans originated fiscal year before current fiscal year	35	303
Term loans originated two years before current fiscal year	58	1,293
Term loans originated three years before current fiscal year	230	1,329
Term loans originated four years before current fiscal year	622	886
Term loans originated five years before current fiscal year	7,659	11,494
Revolving loans	784,891	720,112
Total	793,556	736,288
Home equity | Performing
Credit Quality Indicators By Origination
Term loans originated current fiscal year	61	871
Term loans originated fiscal year before current fiscal year	35	303
Term loans originated two years before current fiscal year	58	1,260
Term loans originated three years before current fiscal year	199	1,328
Term loans originated four years before current fiscal year	622	886
Term loans originated five years before current fiscal year	7,463	10,589
Revolving loans	782,629	717,089
Total	791,067	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	18	576
Revolving loans	928	1,518
Total	946	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	31	1
Term loans originated four years before current fiscal year	0	0
Term loans originated five years before current fiscal year	178	329
Revolving loans	1,334	1,505
Total	1,543	1,868
Other consumer
Credit Quality Indicators By Origination
Term loans originated current fiscal year	126,897	151,407
Term loans originated fiscal year before current fiscal year	102,979	80,531
Term loans originated two years before current fiscal year	55,245	37,036
Term loans originated three years before current fiscal year	22,762	19,563
Term loans originated four years before current fiscal year	12,195	8,591
Term loans originated five years before current fiscal year	17,769	17,763
Revolving loans	38,756	33,948
Total	376,603	348,839
Other consumer | Performing
Credit Quality Indicators By Origination
Term loans originated current fiscal year	126,660	150,910
Term loans originated fiscal year before current fiscal year	102,597	80,072
Term loans originated two years before current fiscal year	55,055	36,647
Term loans originated three years before current fiscal year	22,360	19,268
Term loans originated four years before current fiscal year	11,924	8,506
Term loans originated five years before current fiscal year	15,963	15,968
Revolving loans	38,732	33,680
Total	373,291	345,051
Other consumer | 30-89 Days Past Due
Credit Quality Indicators By Origination
Term loans originated current fiscal year	195	469
Term loans originated fiscal year before current fiscal year	299	443
Term loans originated two years before current fiscal year	155	187
Term loans originated three years before current fiscal year	233	144
Term loans originated four years before current fiscal year	92	78
Term loans originated five years before current fiscal year	1,568	1,589
Revolving loans	22	257
Total	2,564	3,167
Other consumer | Non-Accrual and 90 Days or More Past Due
Credit Quality Indicators By Origination
Term loans originated current fiscal year	42	28
Term loans originated fiscal year before current fiscal year	83	16
Term loans originated two years before current fiscal year	35	202
Term loans originated three years before current fiscal year	169	151
Term loans originated four years before current fiscal year	179	7
Term loans originated five years before current fiscal year	238	206
Revolving loans	2	11
Total	$ 748	$ 621