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Allowance for Loan and Lease Losses - Average Recorded Investment and Interest Income (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Originated  
Financing Receivable, Impaired [Line Items]  
Average Recorded Investment With No Related Allowance $ 11,548
Interest Income Recognized With No Related Allowance 0
Average Recorded Investment With Related Allowance 1,026
Interest Income Recognized With Related Allowance 0
Total Average Recorded Investment 12,574
Total Interest Income Recognized 0
Originated | Commercial and industrial | Other  
Financing Receivable, Impaired [Line Items]  
Average Recorded Investment With No Related Allowance 1,468
Interest Income Recognized With No Related Allowance 0
Average Recorded Investment With Related Allowance 581
Interest Income Recognized With Related Allowance 0
Originated | Commercial real estate | Other  
Financing Receivable, Impaired [Line Items]  
Average Recorded Investment With No Related Allowance 6,099
Interest Income Recognized With No Related Allowance 0
Average Recorded Investment With Related Allowance 445
Interest Income Recognized With Related Allowance 0
Originated | Residential real estate | Home equity  
Financing Receivable, Impaired [Line Items]  
Average Recorded Investment With No Related Allowance 3,981
Interest Income Recognized With No Related Allowance 0
Acquired  
Financing Receivable, Impaired [Line Items]  
Average Recorded Investment With No Related Allowance 3,454
Interest Income Recognized With No Related Allowance 0
Total Average Recorded Investment 3,454
Total Interest Income Recognized 0
Acquired | Commercial and industrial | Other  
Financing Receivable, Impaired [Line Items]  
Average Recorded Investment With No Related Allowance 22
Interest Income Recognized With No Related Allowance 0
Acquired | Commercial real estate | Other  
Financing Receivable, Impaired [Line Items]  
Average Recorded Investment With No Related Allowance 855
Interest Income Recognized With No Related Allowance 0
Acquired | Residential real estate | Home equity  
Financing Receivable, Impaired [Line Items]  
Average Recorded Investment With No Related Allowance 2,577
Interest Income Recognized With No Related Allowance $ 0