Credit Quality Indicators for Commercial Loans (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Commercial Real Estate
Credit Quality Indicators By Origination
Term loans originated in 2020 (year-to-date)	$ 339,688
Term loans originated in 2019	1,177,694
Term loans originated in 2018	1,082,524
Term loans originated in 2017	823,352
Term loans originated in 2016	560,146
Term loans originated in 2015 and prior	1,782,598
Revolving loans	162,301
Loans receivable	5,928,303
Commercial Real Estate | Pass
Credit Quality Indicators By Origination
Term loans originated in 2020 (year-to-date)	338,459
Term loans originated in 2019	1,170,434
Term loans originated in 2018	1,048,933
Term loans originated in 2017	801,190
Term loans originated in 2016	542,535
Term loans originated in 2015 and prior	1,732,836
Revolving loans	154,117
Loans receivable	5,788,504
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	3,421
Term loans originated in 2016	0
Term loans originated in 2015 and prior	0
Revolving loans	0
Loans receivable	3,421
Commercial Real Estate | Substandard
Credit Quality Indicators By Origination
Term loans originated in 2020 (year-to-date)	1,229
Term loans originated in 2019	7,260
Term loans originated in 2018	33,591
Term loans originated in 2017	18,741
Term loans originated in 2016	17,611
Term loans originated in 2015 and prior	49,352
Revolving loans	8,182
Loans receivable	135,966
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	410
Revolving loans	2
Loans receivable	412
Other Commercial
Credit Quality Indicators By Origination
Term loans originated in 2020 (year-to-date)	142,965
Term loans originated in 2019	386,443
Term loans originated in 2018	350,710
Term loans originated in 2017	340,398
Term loans originated in 2016	217,527
Term loans originated in 2015 and prior	220,822
Revolving loans	581,013
Loans receivable	2,239,878
Other Commercial | Pass
Credit Quality Indicators By Origination
Term loans originated in 2020 (year-to-date)	139,929
Term loans originated in 2019	380,272
Term loans originated in 2018	345,567
Term loans originated in 2017	334,937
Term loans originated in 2016	214,790
Term loans originated in 2015 and prior	213,739
Revolving loans	567,842
Loans receivable	2,197,076
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	0
Revolving loans	0
Loans receivable	0
Other Commercial | Substandard
Credit Quality Indicators By Origination
Term loans originated in 2020 (year-to-date)	3,036
Term loans originated in 2019	6,171
Term loans originated in 2018	5,142
Term loans originated in 2017	5,020
Term loans originated in 2016	2,588
Term loans originated in 2015 and prior	6,513
Revolving loans	13,060
Loans receivable	41,530
Other Commercial | 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	1
Term loans originated in 2017	441
Term loans originated in 2016	149
Term loans originated in 2015 and prior	570
Revolving loans	111
Loans receivable	$ 1,272