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Allowance for Credit Losses - Recorded Investment and Related Allowance (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Originated  
Financing Receivable, Impaired [Line Items]  
Recorded investment with no related allowance $ 15,849
Unpaid principal balance with no related allowance 16,974
Recorded investment with related allowance 3,536
Unpaid principal balance with related allowance 3,536
Impaired Financing Receivable, Related Allowance 907
Recorded investment 19,385
Unpaid Principal Balance 20,510
Originated | Commercial and industrial | Other  
Financing Receivable, Impaired [Line Items]  
Recorded investment with no related allowance 1,865
Unpaid principal balance with no related allowance 1,965
Recorded investment with related allowance 245
Unpaid principal balance with related allowance 245
Impaired Financing Receivable, Related Allowance 245
Originated | Commercial real estate | Other  
Financing Receivable, Impaired [Line Items]  
Recorded investment with no related allowance 10,205
Unpaid principal balance with no related allowance 11,017
Recorded investment with related allowance 3,291
Unpaid principal balance with related allowance 3,291
Impaired Financing Receivable, Related Allowance 662
Originated | Residential real estate | Home equity  
Financing Receivable, Impaired [Line Items]  
Recorded investment with no related allowance 3,779
Unpaid principal balance with no related allowance 3,992
Acquired  
Financing Receivable, Impaired [Line Items]  
Recorded investment 2,830
Unpaid Principal Balance 2,933
Acquired | Commercial and industrial | Other  
Financing Receivable, Impaired [Line Items]  
Recorded investment with no related allowance 2
Unpaid principal balance with no related allowance 2
Acquired | Commercial real estate | Other  
Financing Receivable, Impaired [Line Items]  
Recorded investment with no related allowance 714
Unpaid principal balance with no related allowance 714
Acquired | Residential real estate | Home equity  
Financing Receivable, Impaired [Line Items]  
Recorded investment with no related allowance 2,114
Unpaid principal balance with no related allowance $ 2,217