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Allowance for Credit Losses - Average Recorded Investment and Interest Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Originated    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance $ 12,848 $ 12,610
Interest Income Recognized With No Related Allowance 0 0
Average Recorded Investment With Related Allowance 1,981 911
Interest Income Recognized With Related Allowance 0 0
Total Average Recorded Investment 14,829 13,521
Total Interest Income Recognized 0 0
Originated | Commercial and industrial | Other    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 1,505 2,123
Interest Income Recognized With No Related Allowance 0 0
Average Recorded Investment With Related Allowance 273 154
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 7,380 6,509
Interest Income Recognized With No Related Allowance 0 0
Average Recorded Investment With Related Allowance 1,708 757
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 3,963 3,978
Interest Income Recognized With No Related Allowance 0 0
Acquired    
Financing Receivable, Impaired [Line Items]    
Total Average Recorded Investment 3,471 3,468
Total Interest Income Recognized 0 0
Acquired | Commercial and industrial | Other    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 29 28
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 857 834
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 2,585 2,606
Interest Income Recognized With No Related Allowance $ 0 $ 0