Loans and Leases - Non-performing Loans and Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	$ 3,634,411	$ 3,693,562
Originated
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	3,386,727	3,325,065
Acquired
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	247,684	368,497
Nonperforming Financial Instruments
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	5,306	10,648
Nonperforming Financial Instruments | Originated
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	3,949	5,636
Nonperforming Financial Instruments | Acquired
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	1,357	5,012
Real estate loans | CRE - nonowner-occupied | Nonperforming Financial Instruments
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	57	199
Real estate loans | CRE - nonowner-occupied | Nonperforming Financial Instruments | Originated
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	57	199
Real estate loans | CRE - nonowner-occupied | Nonperforming Financial Instruments | Acquired
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	0	0
Real estate loans | CRE - owner-occupied | Nonperforming Financial Instruments
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	1,659	4,159
Real estate loans | CRE - owner-occupied | Nonperforming Financial Instruments | Originated
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	823	1,523
Real estate loans | CRE - owner-occupied | Nonperforming Financial Instruments | Acquired
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	836	2,636
Real estate loans | Home equity lines of credit | Nonperforming Financial Instruments
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	729	636
Real estate loans | Home equity lines of credit | Nonperforming Financial Instruments | Originated
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	515	636
Real estate loans | Home equity lines of credit | Nonperforming Financial Instruments | Acquired
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	214	0
Real estate loans | Residential Mortgage | 1st liens | Nonperforming Financial Instruments
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	99	2,447
Real estate loans | Residential Mortgage | 1st liens | Nonperforming Financial Instruments | Originated
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	26	630
Real estate loans | Residential Mortgage | 1st liens | Nonperforming Financial Instruments | Acquired
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	73	1,817
Real estate loans | Residential Mortgage | Junior liens | Nonperforming Financial Instruments
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	85	83
Real estate loans | Residential Mortgage | Junior liens | Nonperforming Financial Instruments | Originated
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	50	83
Real estate loans | Residential Mortgage | Junior liens | Nonperforming Financial Instruments | Acquired
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	35	0
Commercial & Industrial | Nonperforming Financial Instruments
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	1,775	2,180
Commercial & Industrial | Nonperforming Financial Instruments | Originated
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	1,657	1,799
Commercial & Industrial | Nonperforming Financial Instruments | Acquired
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	118	381
Consumer | Nonperforming Financial Instruments
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	30	61
Consumer | Nonperforming Financial Instruments | Originated
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	30	19
Consumer | Nonperforming Financial Instruments | Acquired
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	0	42
Leases | Nonperforming Financial Instruments
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	872	883
Leases | Nonperforming Financial Instruments | Originated
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	791	747
Leases | Nonperforming Financial Instruments | Acquired
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	81	136
Construction Loans | Nonperforming Financial Instruments
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	0	0
Construction Loans | Nonperforming Financial Instruments | Originated
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	0	0
Construction Loans | Nonperforming Financial Instruments | Acquired
Loans and Leases Receivable Disclosure [Line Items]
Total Accruing Loans and Leases	$ 0	$ 0