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Allowance for Loan and Lease Losses (Details 4) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Originated Loans and Leases    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance $ 11,930 $ 8,613
Interest Income Recognized With No Related Allowance 0 0
Average Recorded Investment With Related Allowance 752 591
Interest Income Recognized With Related Allowance 0 0
Average Recorded Investment 12,682 9,204
Interest Income Recognized 0 0
Originated Loans and Leases | Commercial and Industrial Other    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 280 624
Interest Income Recognized With No Related Allowance 0  
Average Recorded Investment With Related Allowance 155 4
Interest Income Recognized With Related Allowance 0 0
Originated Loans and Leases | Commercial Real Estate Other    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 8,162 5,699
Interest Income Recognized With No Related Allowance 0  
Average Recorded Investment With Related Allowance 597 587
Interest Income Recognized With Related Allowance 0 0
Originated Loans and Leases | Residential Real Estate - Home equity    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 3,488 2,290
Interest Income Recognized With No Related Allowance 0  
Total Acquired Loans    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 4,322 7,022
Interest Income Recognized With No Related Allowance 0 0
Average Recorded Investment With Related Allowance 137 550
Interest Income Recognized With Related Allowance 0 0
Average Recorded Investment 4,459 7,572
Interest Income Recognized 0 0
Total Acquired Loans | Commercial and Industrial Other    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 165 594
Interest Income Recognized With No Related Allowance 0 0
Average Recorded Investment With Related Allowance 0 518
Interest Income Recognized With Related Allowance 0 0
Total Acquired Loans | Commercial Real Estate Other    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 2,746 5,176
Interest Income Recognized With No Related Allowance 0 0
Average Recorded Investment With Related Allowance 77 32
Interest Income Recognized With Related Allowance 0 0
Total Acquired Loans | Commercial Real Estate - Construction    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 0 359
Interest Income Recognized With No Related Allowance 0 0
Total Acquired Loans | Residential Real Estate - Home equity    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment With No Related Allowance 1,411 893
Interest Income Recognized With No Related Allowance 0 $ 0
Average Recorded Investment With Related Allowance $ 60