New Accounting Pronouncement - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018	Sep. 30, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease right of use asset	$ 137,076		$ 0
Opearing lease liability	152,421		$ 0
Cumulative effect of accounting change	$ 4,905			$ 1,935
ASU 2016-02
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease right of use asset		$ 139,000
Deferred rent liabilities		15,000
Opearing lease liability		154,000
Cumulative effect of accounting change		$ 4,800
ASU 2016-13
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Decrease to the Common Equity Tier One and Total Capital ratio	30.00%
Tier 2 Allowance Limit	1.25%
ASU 2016-13 | Minimum
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit loss, increase (decrease)	$ 360,000
Allowance for credit loss change of existing reserve	85.00%
ASU 2016-13 | Maximum
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit loss, increase (decrease)	$ 400,000
Allowance for credit loss change of existing reserve	95.00%