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Allowance for Credit Losses - Average Recorded Investment and Interest Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Originated    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance $ 9,058 $ 11,746
Interest Income Recognized With No Related Allowance 0 0
Average Recorded Investment With Related Allowance 2,272 1,193
Interest Income Recognized With Related Allowance 0 0
Total Average Recorded Investment 11,330 12,939
Total Interest Income Recognized 0 0
Originated | Commercial and industrial | Commercial and industrial other    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 1,331 2,352
Interest Income Recognized With No Related Allowance 0 0
Average Recorded Investment With Related Allowance 693 487
Interest Income Recognized With Related Allowance 0 0
Originated | Commercial real estate | Commercial and industrial other    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 3,718 5,400
Interest Income Recognized With No Related Allowance 0 0
Average Recorded Investment With Related Allowance 1,579 706
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 4,009 3,994
Interest Income Recognized With No Related Allowance 0 0
Acquired    
Financing Receivable, Impaired [Line Items]    
Total Average Recorded Investment 3,420 3,522
Total Interest Income Recognized 0 0
Acquired | Commercial and industrial | Commercial and industrial other    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 12 35
Interest Income Recognized With No Related Allowance 0 0
Acquired | Commercial real estate | Commercial and industrial other    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 851 896
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 2,557 2,591
Interest Income Recognized With No Related Allowance $ 0 $ 0