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Allowance for Credit Losses - Average Recorded Investment and Interest Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment $ 18,200 $ 17,900
Originated    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 13,325 11,127
Interest Income Recognized With No Related Allowance 0 0
Average Recorded Investment With Related Allowance 1,523 2,731
Interest Income Recognized With Related Allowance 0 0
Average Recorded Investment 14,848 13,858
Interest Income Recognized 0 0
Originated | Commercial and industrial | Other    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 1,830 1,979
Interest Income Recognized With No Related Allowance 0 0
Average Recorded Investment With Related Allowance 132 1,374
Interest Income Recognized With Related Allowance 0 0
Originated | Commercial real estate | Other    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 7,552 5,165
Interest Income Recognized With No Related Allowance 0 0
Average Recorded Investment With Related Allowance 1,391 1,357
Interest Income Recognized With Related Allowance 0 0
Originated | Residential Real Estate | Home equity    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 3,943 3,983
Interest Income Recognized With No Related Allowance 0 0
Acquired    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With Related Allowance 0 0
Interest Income Recognized With Related Allowance 0 0
Average Recorded Investment 3,346 3,994
Interest Income Recognized 0 0
Acquired | Commercial and industrial | Other    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 21 50
Interest Income Recognized With No Related Allowance 0 0
Acquired | Commercial real estate | Other    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 822 999
Interest Income Recognized With No Related Allowance 0 0
Acquired | Residential Real Estate | Home equity    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 2,503 2,945
Interest Income Recognized With No Related Allowance $ 0 $ 0