Summary of Significant Accounting Policies - Schedule of Allowance for Credit Losses Upon Adoption of ASU 2016-13 (Details) - USD ($) $ in Thousands	Jan. 01, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Total Allowance for Credit Losses		$ 216,252	$ 110,027	$ 106,693	$ 107,346
Accounting Standards Update 2016-13
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Total Allowance for Credit Losses			110,027
Reserve for Unfunded Commitments			6,822
Total Reserve for Credit Losses			116,849
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Total Allowance for Credit Losses	$ (1,737)		(1,737)
Reserve for Unfunded Commitments	(3,335)
Total Reserve for Credit Losses	(5,072)
Retained Earnings
Total Pre-tax Impact	5,072
Tax Effect	(1,440)
Increase to Retained Earnings	3,632
Accounting Standards Update 2016-13 | January 1, 2020
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Total Allowance for Credit Losses	108,290		108,290
Reserve for Unfunded Commitments	3,487
Total Reserve for Credit Losses	111,777
Accounting Standards Update 2016-13 | Commercial Loan
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Total Allowance for Credit Losses			73,801
Accounting Standards Update 2016-13 | Commercial Loan | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Total Allowance for Credit Losses	(18,789)
Accounting Standards Update 2016-13 | Commercial Loan | January 1, 2020
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Total Allowance for Credit Losses	55,012
Accounting Standards Update 2016-13 | Consumer Loan
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Total Allowance for Credit Losses			$ 36,226
Accounting Standards Update 2016-13 | Consumer Loan | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Total Allowance for Credit Losses	17,052
Accounting Standards Update 2016-13 | Consumer Loan | January 1, 2020
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Total Allowance for Credit Losses	$ 53,278