Allowance for Loan and Lease Losses and Credit Quality - Summary of TDR Modifications (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification Investment	$ 51,758	$ 21,048	$ 24,070
Post-modification Investment	51,528	20,973	23,847
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification Investment	41,344	12,481	13,343
Post-modification Investment	41,344	12,481	13,318
Commercial | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification Investment	5,347	7,253	10,266
Post-modification Investment	5,347	7,253	10,241
Commercial | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification Investment	35,997	5,228	3,077
Post-modification Investment	35,997	5,228	3,077
Consumer Loan Portfolio
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification Investment	10,414	8,567	10,727
Post-modification Investment	10,184	8,492	10,529
Consumer Loan Portfolio | Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification Investment	6,053	5,333	7,666
Post-modification Investment	5,912	5,259	7,480
Consumer Loan Portfolio | Consumer installment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification Investment	217	1,052	892
Post-modification Investment	183	1,052	892
Consumer Loan Portfolio | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification Investment	4,144	2,182	2,169
Post-modification Investment	$ 4,089	$ 2,181	$ 2,157