Bank Loans (Schedule of Term Loans Amortized Cost Basis by Origination Year and Revolving Cost Amortized Cost Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	$ 17,761,548	$ 16,743,487
Commercial And Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	7,656,507	7,345,753
Commercial And Industrial | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty Two [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	451,990
Commercial And Industrial | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty One [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	1,641,198
Commercial And Industrial | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	332,214
Commercial And Industrial | Term Loans Amortized Cost Basis By Origination Year Two Thousand Nineteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	419,468
Commercial And Industrial | Term Loans Amortized Cost Basis By Origination Year Two Thousand Eighteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	463,308
Commercial And Industrial | Term Loans Amortized Cost Basis By Origination Year Two Thousand Seventeen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	607,520
Commercial And Industrial | Revolving Loans Amortized Cost Basis [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	3,740,809
Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	6,008,507	5,482,026
Residential Mortgage | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty Two [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	855,640
Residential Mortgage | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty One [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	2,659,672
Residential Mortgage | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	1,131,094
Residential Mortgage | Term Loans Amortized Cost Basis By Origination Year Two Thousand Nineteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	519,260
Residential Mortgage | Term Loans Amortized Cost Basis By Origination Year Two Thousand Eighteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	214,470
Residential Mortgage | Term Loans Amortized Cost Basis By Origination Year Two Thousand Sixteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	628,371
Securities-Based Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	2,954,212	2,880,158
Securities-Based Loans [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty One [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	74,148
Securities-Based Loans [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	34,445
Securities-Based Loans [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Nineteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	88,778
Securities-Based Loans [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Eighteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year
Securities-Based Loans [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Sixteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	10,312
Securities-Based Loans [Member] | Revolving Loans Amortized Cost Basis [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	2,746,529
Construction And Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	521,623	511,084
Construction And Land [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty One [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	33,532
Construction And Land [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	162,879
Construction And Land [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Nineteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	156,479
Construction And Land [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Eighteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	101,151
Construction And Land [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Sixteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	67,582
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	499,825	409,847
Commercial Real Estate [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty Two [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	83,891
Commercial Real Estate [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty One [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	124,648
Commercial Real Estate [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	72,901
Commercial Real Estate [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Nineteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	149,226
Commercial Real Estate [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Eighteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	21,951
Commercial Real Estate [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Sixteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	47,208
Home Equity Lines Of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	87,901	82,508
Home Equity Lines Of Credit [Member] | Revolving Loans Amortized Cost Basis [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	87,901
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	32,973	32,111
Other [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty Two [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	240
Other [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty One [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	779
Other [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	10,000
Other [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Eighteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	1,031
Other [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Sixteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	19,155
Other [Member] | Revolving Loans Amortized Cost Basis [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	1,768
Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	17,587,865	16,553,018
Pass [Member] | Commercial And Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	7,504,185	7,193,435
Pass [Member] | Commercial And Industrial | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty Two [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	451,990
Pass [Member] | Commercial And Industrial | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty One [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	1,641,198
Pass [Member] | Commercial And Industrial | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	331,699
Pass [Member] | Commercial And Industrial | Term Loans Amortized Cost Basis By Origination Year Two Thousand Nineteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	361,033
Pass [Member] | Commercial And Industrial | Term Loans Amortized Cost Basis By Origination Year Two Thousand Eighteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	400,325
Pass [Member] | Commercial And Industrial | Term Loans Amortized Cost Basis By Origination Year Two Thousand Sixteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	581,516
Pass [Member] | Commercial And Industrial | Revolving Loans Amortized Cost Basis [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	3,736,424
Pass [Member] | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	6,007,175	5,480,693
Pass [Member] | Residential Mortgage | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty Two [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	855,640
Pass [Member] | Residential Mortgage | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty One [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	2,659,672
Pass [Member] | Residential Mortgage | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	1,131,094
Pass [Member] | Residential Mortgage | Term Loans Amortized Cost Basis By Origination Year Two Thousand Nineteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	519,260
Pass [Member] | Residential Mortgage | Term Loans Amortized Cost Basis By Origination Year Two Thousand Eighteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	214,470
Pass [Member] | Residential Mortgage | Term Loans Amortized Cost Basis By Origination Year Two Thousand Sixteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	627,039
Pass [Member] | Securities-Based Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	2,954,212	2,880,158
Pass [Member] | Securities-Based Loans [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty One [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	74,148
Pass [Member] | Securities-Based Loans [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	34,445
Pass [Member] | Securities-Based Loans [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Nineteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	88,778
Pass [Member] | Securities-Based Loans [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Sixteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	10,312
Pass [Member] | Securities-Based Loans [Member] | Revolving Loans Amortized Cost Basis [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	2,746,529
Pass [Member] | Construction And Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	501,623	476,844
Pass [Member] | Construction And Land [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty One [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	33,532
Pass [Member] | Construction And Land [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	162,879
Pass [Member] | Construction And Land [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Nineteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	156,479
Pass [Member] | Construction And Land [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Eighteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	81,151
Pass [Member] | Construction And Land [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Sixteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	67,582
Pass [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	499,825	407,298
Pass [Member] | Commercial Real Estate [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty Two [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	83,891
Pass [Member] | Commercial Real Estate [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty One [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	124,648
Pass [Member] | Commercial Real Estate [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	72,901
Pass [Member] | Commercial Real Estate [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Nineteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	149,226
Pass [Member] | Commercial Real Estate [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Eighteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	21,951
Pass [Member] | Commercial Real Estate [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Sixteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	47,208
Pass [Member] | Home Equity Lines Of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	87,872	82,479
Pass [Member] | Home Equity Lines Of Credit [Member] | Revolving Loans Amortized Cost Basis [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	87,872
Pass [Member] | Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	32,973	32,111
Pass [Member] | Other [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty Two [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	240
Pass [Member] | Other [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty One [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	779
Pass [Member] | Other [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	10,000
Pass [Member] | Other [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Eighteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	1,031
Pass [Member] | Other [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Sixteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	19,155
Pass [Member] | Other [Member] | Revolving Loans Amortized Cost Basis [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	1,768
Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	38,000	54,817
Special Mention [Member] | Commercial And Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	38,000	38,000
Special Mention [Member] | Commercial And Industrial | Term Loans Amortized Cost Basis By Origination Year Two Thousand Nineteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	30,000
Special Mention [Member] | Commercial And Industrial | Term Loans Amortized Cost Basis By Origination Year Two Thousand Eighteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	8,000
Special Mention [Member] | Construction And Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year		14,240
Special Mention [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year		2,548
Special Mention [Member] | Home Equity Lines Of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year		29
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	118,874	127,831
Substandard [Member] | Commercial And Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	98,845	107,747
Substandard [Member] | Commercial And Industrial | Term Loans Amortized Cost Basis By Origination Year Two Thousand Nineteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	28,435
Substandard [Member] | Commercial And Industrial | Term Loans Amortized Cost Basis By Origination Year Two Thousand Eighteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	46,217
Substandard [Member] | Commercial And Industrial | Term Loans Amortized Cost Basis By Origination Year Two Thousand Sixteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	19,808
Substandard [Member] | Commercial And Industrial | Revolving Loans Amortized Cost Basis [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	4,385
Substandard [Member] | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year		84
Substandard [Member] | Construction And Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	20,000	20,000
Substandard [Member] | Construction And Land [Member] | Term Loans Amortized Cost Basis By Origination Year Two Thousand Eighteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	20,000
Substandard [Member] | Home Equity Lines Of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	29
Substandard [Member] | Home Equity Lines Of Credit [Member] | Revolving Loans Amortized Cost Basis [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	29
Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	16,809	7,821
Doubtful [Member] | Commercial And Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	15,477	6,571
Doubtful [Member] | Commercial And Industrial | Term Loans Amortized Cost Basis By Origination Year Two Thousand Twenty [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	515
Doubtful [Member] | Commercial And Industrial | Term Loans Amortized Cost Basis By Origination Year Two Thousand Eighteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	8,766
Doubtful [Member] | Commercial And Industrial | Term Loans Amortized Cost Basis By Origination Year Two Thousand Sixteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	6,196
Doubtful [Member] | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	1,332	1,249
Doubtful [Member] | Residential Mortgage | Term Loans Amortized Cost Basis By Origination Year Two Thousand Sixteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year	$ 1,332
Doubtful [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans amortized cost basis by origination year		$ 1