ACL for Loans - Prior Period Adversely Classified Loans (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans $ 3,087,246
Commercial real estate  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 1,478,235
Commercial and industrial  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 435,660
Commercial construction  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 373,309
SBA Paycheck Protection Program ("PPP")  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 453,084
Residential mortgages  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 252,971
Home equity loans and lines  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 85,006
Consumer  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 8,981
Substandard  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 52,386
Substandard | Commercial real estate  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 40,088
Substandard | Commercial and industrial  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 7,901
Substandard | Commercial construction  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 3,501
Substandard | SBA Paycheck Protection Program ("PPP")  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 0
Substandard | Residential mortgages  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 474
Substandard | Home equity loans and lines  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 381
Substandard | Consumer  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 41
Doubtful  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 2,490
Doubtful | Commercial real estate  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 197
Doubtful | Commercial and industrial  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 2,293
Doubtful | Commercial construction  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 0
Doubtful | SBA Paycheck Protection Program ("PPP")  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 0
Doubtful | Residential mortgages  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 0
Doubtful | Home equity loans and lines  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 0
Doubtful | Consumer  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 0
Loss  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 0
Loss | Commercial real estate  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 0
Loss | Commercial and industrial  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 0
Loss | Commercial construction  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 0
Loss | SBA Paycheck Protection Program ("PPP")  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 0
Loss | Residential mortgages  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 0
Loss | Home equity loans and lines  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 0
Loss | Consumer  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 0
Not Adversely Classified  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 3,032,370
Not Adversely Classified | Commercial real estate  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 1,437,950
Not Adversely Classified | Commercial and industrial  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 425,466
Not Adversely Classified | Commercial construction  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 369,808
Not Adversely Classified | SBA Paycheck Protection Program ("PPP")  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 453,084
Not Adversely Classified | Residential mortgages  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 252,497
Not Adversely Classified | Home equity loans and lines  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans 84,625
Not Adversely Classified | Consumer  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total loans $ 8,940