Loans Held for Sale, Loans and Allowance for Credit Losses - Summary of Types of Loan Modifications that were Modified into TDRs (Details) - TDR	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Financing Receivable Modifications [Line Items]
Number of Loans Modified	7	1
Rate Concession
Financing Receivable Modifications [Line Items]
Number of Loans Modified	1
Modified Terms and/or Other Concessions
Financing Receivable Modifications [Line Items]
Number of Loans Modified	6	1
Commercial and Industrial
Financing Receivable Modifications [Line Items]
Number of Loans Modified	7	1
Commercial and Industrial | Rate Concession
Financing Receivable Modifications [Line Items]
Number of Loans Modified	1
Commercial and Industrial | Modified Terms and/or Other Concessions
Financing Receivable Modifications [Line Items]
Number of Loans Modified	6	1