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Allowance for Loan and Lease Losses - Average Recorded Investment and Interest Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Originated Loans and Leases    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance $ 12,752 $ 11,930
Interest Income Recognized With No Related Allowance 0 0
Average Recorded Investment With Related Allowance 877 752
Interest Income Recognized With Related Allowance 0 0
Impaired Financing Receivable, Average Recorded Investment 13,629 12,682
Impaired Financing Receivable, Interest Income, Accrual Method 0 0
Total Acquired Loans    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 3,542 4,322
Interest Income Recognized With No Related Allowance 0 0
Average Recorded Investment With Related Allowance 37 137
Interest Income Recognized With Related Allowance 0 0
Impaired Financing Receivable, Average Recorded Investment 3,579 4,459
Impaired Financing Receivable, Interest Income, Accrual Method 0 0
Commercial and industrial | Originated Loans and Leases | Commercial and industrial other    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 2,399 280
Interest Income Recognized With No Related Allowance 0 0
Average Recorded Investment With Related Allowance 864 155
Interest Income Recognized With Related Allowance 0 0
Commercial and industrial | Total Acquired Loans | Commercial and industrial other    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 265 165
Interest Income Recognized With No Related Allowance 0 0
Average Recorded Investment With Related Allowance 37 0
Interest Income Recognized With Related Allowance 0 0
Commercial real estate | Originated Loans and Leases | Commercial and industrial other    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 6,373 8,162
Interest Income Recognized With No Related Allowance 0 0
Average Recorded Investment With Related Allowance 13 597
Interest Income Recognized With Related Allowance 0 0
Commercial real estate | Total Acquired Loans | Commercial and industrial other    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 1,469 2,746
Interest Income Recognized With No Related Allowance 0 0
Average Recorded Investment With Related Allowance 0 77
Interest Income Recognized With Related Allowance 0 0
Residential real estate | Originated Loans and Leases | Home equity    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 3,980 3,488
Interest Income Recognized With No Related Allowance 0 0
Residential real estate | Total Acquired Loans | Home equity    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 1,808 1,411
Interest Income Recognized With No Related Allowance 0 0
Average Recorded Investment With Related Allowance 0 $ 60
Interest Income Recognized With Related Allowance $ 0