Subsequent Events Loan Modifications (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) contract	Mar. 31, 2019 contract
Subsequent Event [Line Items]
In process PPP Loans	$ 818,900,000
Number of loan modification requests	1,941
Financing Receivable, Modifications, Number of Contracts | contract	5	2
Number of Loan Modification Requests as a percent of Total Loans	4.38%
Amount of Loan Modification Requests	$ 1,421,908
Loan Modification Requests as a Percent of Total Loans	15.95%
Average PPP Loan Balance	$ 160,000
Median PPP Loan Balance	41,000
Process fee income PPP Loans	$ 25,900,000
Commercial And Industrial [Member]
Subsequent Event [Line Items]
Number of loan modification requests	308
Financing Receivable, Modifications, Number of Contracts | contract	2
Number of Loan Modification Requests as a percent of Total Loans	0.69%
Amount of Loan Modification Requests	$ 163,889
Loan Modification Requests as a Percent of Total Loans	1.84%
Commercial Real Estate Portfolio Segment [Member]
Subsequent Event [Line Items]
Number of loan modification requests	557
Number of Loan Modification Requests as a percent of Total Loans	1.27%
Amount of Loan Modification Requests	$ 967,643
Loan Modification Requests as a Percent of Total Loans	10.86%
Construction [Member]
Subsequent Event [Line Items]
Number of loan modification requests	19
Number of Loan Modification Requests as a percent of Total Loans	0.04%
Amount of Loan Modification Requests	$ 37,811
Loan Modification Requests as a Percent of Total Loans	0.42%
Small Business [Member]
Subsequent Event [Line Items]
Number of loan modification requests	289
Financing Receivable, Modifications, Number of Contracts | contract	1
Number of Loan Modification Requests as a percent of Total Loans	0.65%
Amount of Loan Modification Requests	$ 21,781
Loan Modification Requests as a Percent of Total Loans	0.24%
Residential Real Estate [Member]
Subsequent Event [Line Items]
Number of loan modification requests	438
Financing Receivable, Modifications, Number of Contracts | contract	1
Number of Loan Modification Requests as a percent of Total Loans	0.99%
Amount of Loan Modification Requests	$ 185,530
Loan Modification Requests as a Percent of Total Loans	2.08%
Home Equity Loan [Member]
Subsequent Event [Line Items]
Number of loan modification requests	308
Number of Loan Modification Requests as a percent of Total Loans	0.69%
Amount of Loan Modification Requests	$ 44,695
Loan Modification Requests as a Percent of Total Loans	0.50%
Consumer Portfolio Segment [Member]
Subsequent Event [Line Items]
Number of loan modification requests	22
Number of Loan Modification Requests as a percent of Total Loans	0.05%
Amount of Loan Modification Requests	$ 559
Loan Modification Requests as a Percent of Total Loans	0.01%