Credit Quality Indicators for Commercial Loans (Details) $ in Thousands	Jun. 30, 2020 USD ($)
Commercial Real Estate
Credit Quality Indicators By Origination
Term loans originated in 2020 (year-to-date)	$ 659,384
Term loans originated in 2019	1,185,582
Term loans originated in 2018	1,037,111
Term loans originated in 2017	809,549
Term loans originated in 2016	553,420
Term loans originated in 2015 and prior	1,654,405
Revolving loans	148,241
Loans receivable	6,047,692
Commercial Real Estate | Pass
Credit Quality Indicators By Origination
Term loans originated in 2020 (year-to-date)	656,332
Term loans originated in 2019	1,176,792
Term loans originated in 2018	1,003,201
Term loans originated in 2017	786,960
Term loans originated in 2016	534,881
Term loans originated in 2015 and prior	1,622,710
Revolving loans	146,605
Loans receivable	5,927,481
Commercial Real Estate | Special Mention
Credit Quality Indicators By Origination
Term loans originated in 2020 (year-to-date)	0
Term loans originated in 2019	0
Term loans originated in 2018	0
Term loans originated in 2017	0
Term loans originated in 2016	0
Term loans originated in 2015 and prior	66
Revolving loans	0
Loans receivable	66
Commercial Real Estate | Substandard
Credit Quality Indicators By Origination
Term loans originated in 2020 (year-to-date)	3,052
Term loans originated in 2019	8,790
Term loans originated in 2018	33,910
Term loans originated in 2017	22,589
Term loans originated in 2016	18,539
Term loans originated in 2015 and prior	31,256
Revolving loans	1,636
Loans receivable	119,772
Commercial Real Estate | Doubtful/Loss
Credit Quality Indicators By Origination
Term loans originated in 2020 (year-to-date)	0
Term loans originated in 2019	0
Term loans originated in 2018	0
Term loans originated in 2017	0
Term loans originated in 2016	0
Term loans originated in 2015 and prior	373
Revolving loans	0
Loans receivable	373
Other Commercial
Credit Quality Indicators By Origination
Term loans originated in 2020 (year-to-date)	1,646,307
Term loans originated in 2019	359,481
Term loans originated in 2018	311,638
Term loans originated in 2017	312,198
Term loans originated in 2016	201,794
Term loans originated in 2015 and prior	253,062
Revolving loans	462,769
Loans receivable	3,547,249
Other Commercial | Pass
Credit Quality Indicators By Origination
Term loans originated in 2020 (year-to-date)	1,641,537
Term loans originated in 2019	353,800
Term loans originated in 2018	305,819
Term loans originated in 2017	306,956
Term loans originated in 2016	199,013
Term loans originated in 2015 and prior	243,393
Revolving loans	450,404
Loans receivable	3,500,922
Other Commercial | Special Mention
Credit Quality Indicators By Origination
Term loans originated in 2020 (year-to-date)	0
Term loans originated in 2019	0
Term loans originated in 2018	0
Term loans originated in 2017	0
Term loans originated in 2016	0
Term loans originated in 2015 and prior	2,767
Revolving loans	849
Loans receivable	3,616
Other Commercial | Substandard
Credit Quality Indicators By Origination
Term loans originated in 2020 (year-to-date)	4,770
Term loans originated in 2019	5,679
Term loans originated in 2018	5,818
Term loans originated in 2017	4,747
Term loans originated in 2016	2,582
Term loans originated in 2015 and prior	5,738
Revolving loans	10,541
Loans receivable	39,875
Other Commercial | Doubtful/Loss
Credit Quality Indicators By Origination
Term loans originated in 2020 (year-to-date)	0
Term loans originated in 2019	2
Term loans originated in 2018	1
Term loans originated in 2017	495
Term loans originated in 2016	199
Term loans originated in 2015 and prior	1,164
Revolving loans	975
Loans receivable	$ 2,836