Allowance for Credit Losses - Amortized Cost Basis of Revolving Loans that Were Converted to Term Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Credit quality
Total Revolving Loans Converted to Term Loans During the Period	$ 54,817
Commercial and Industrial
Credit quality
Total Revolving Loans Converted to Term Loans During the Period	35,760
Commercial real estate
Credit quality
Total Revolving Loans Converted to Term Loans During the Period	310
Residential Mortgage.
Credit quality
Total Revolving Loans Converted to Term Loans During the Period	296
Home equity Line
Credit quality
Total Revolving Loans Converted to Term Loans During the Period	13,569
Consumer
Credit quality
Total Revolving Loans Converted to Term Loans During the Period	$ 4,882