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Loans (Impaired Loans) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Recorded Investment of Impaired Loans with No Related Allowance [1] $ 14,389 $ 14,626
Recorded Investment of Impaired Loans with Related Allowance [1] 2,128 5,993
Total Recorded Investment of Impaired Loans [1] 16,517 20,619
Unpaid Principal of Impaired Loans with No Related Allowance 15,387 14,908
Unpaid Principal of Impaired Loans with Related Allowance 2,224 10,995
Total Unpaid Principal of Impaired Loans 17,611 25,903
No Related Allowance on Impaired Loans 0 0
Related Allowance on Impaired Loans 278 1,129
Commercial Real Estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment of Impaired Loans with No Related Allowance [1] 0 0
Recorded Investment of Impaired Loans with Related Allowance [1] 0 4,954
Unpaid Principal of Impaired Loans with No Related Allowance 0 0
Unpaid Principal of Impaired Loans with Related Allowance 0 9,910
No Related Allowance on Impaired Loans 0 0
Related Allowance on Impaired Loans 0 1,018
Commercial & Industrial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment of Impaired Loans with No Related Allowance [1] 5,427 4,986
Recorded Investment of Impaired Loans with Related Allowance [1] 456 191
Unpaid Principal of Impaired Loans with No Related Allowance 6,257 5,081
Unpaid Principal of Impaired Loans with Related Allowance 508 212
No Related Allowance on Impaired Loans 0 0
Related Allowance on Impaired Loans 53 1
Total Commercial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment of Impaired Loans with No Related Allowance [1] 5,427 4,986
Recorded Investment of Impaired Loans with Related Allowance [1] 456 5,145
Total Recorded Investment of Impaired Loans [1] 5,883 10,131
Unpaid Principal of Impaired Loans with No Related Allowance 6,257 5,081
Unpaid Principal of Impaired Loans with Related Allowance 508 10,122
Total Unpaid Principal of Impaired Loans 6,765 15,203
No Related Allowance on Impaired Loans 0 0
Related Allowance on Impaired Loans 53 1,019
Residential Real Estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment of Impaired Loans with No Related Allowance [1] 8,288 9,069
Recorded Investment of Impaired Loans with Related Allowance [1] 1,421 715
Total Recorded Investment of Impaired Loans [1] 9,709 9,784
Unpaid Principal of Impaired Loans with No Related Allowance 8,455 9,256
Unpaid Principal of Impaired Loans with Related Allowance 1,467 741
Total Unpaid Principal of Impaired Loans 9,922 9,997
No Related Allowance on Impaired Loans 0 0
Related Allowance on Impaired Loans 112 104
Home Equity    
Financing Receivable, Impaired [Line Items]    
Recorded Investment of Impaired Loans with No Related Allowance [1] 560 557
Recorded Investment of Impaired Loans with Related Allowance [1] 223 0
Unpaid Principal of Impaired Loans with No Related Allowance 560 557
Unpaid Principal of Impaired Loans with Related Allowance 223 0
No Related Allowance on Impaired Loans 0 0
Related Allowance on Impaired Loans 108 0
Other    
Financing Receivable, Impaired [Line Items]    
Recorded Investment of Impaired Loans with No Related Allowance [1] 114 14
Recorded Investment of Impaired Loans with Related Allowance [1] 28 133
Unpaid Principal of Impaired Loans with No Related Allowance 115 14
Unpaid Principal of Impaired Loans with Related Allowance 26 132
No Related Allowance on Impaired Loans 0 0
Related Allowance on Impaired Loans 5 6
Total Consumer    
Financing Receivable, Impaired [Line Items]    
Recorded Investment of Impaired Loans with No Related Allowance [1] 674 571
Recorded Investment of Impaired Loans with Related Allowance [1] 251 133
Total Recorded Investment of Impaired Loans [1] 925 704
Unpaid Principal of Impaired Loans with No Related Allowance 675 571
Unpaid Principal of Impaired Loans with Related Allowance 249 132
Total Unpaid Principal of Impaired Loans 924 703
No Related Allowance on Impaired Loans 0 0
Related Allowance on Impaired Loans $ 113 $ 6
[1] The recorded investment in impaired loans consists of unpaid principal balance, net of charge-offs, interest payments received applied to principal and unamortized deferred loan origination fees and costs. For accruing impaired loans (troubled debt restructurings for which management has concluded that the collectibility of the loan is not in doubt), the recorded investment also includes accrued interest.