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Credit Quality and Nonperforming Assets (Carrying Amount and Unpaid Principal Balance of Purchased Credit Impaired Loans) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance, Total [1] $ 26,977 $ 28,235
Impaired Financing Receivable, Carrying Value, Total [2] 24,043 25,521
Purchased Credit Impaired Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance, Total 1,143 1,197
Impaired Financing Receivable, Carrying Value, Total 171 188
Purchased Credit Impaired Loans [Member] | Consumer Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance, Total 0 1
Impaired Financing Receivable, Carrying Value, Total 0 0
Purchased Credit Impaired Loans [Member] | Commercial And Industrial Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance, Total 19 38
Impaired Financing Receivable, Carrying Value, Total 0 0
Purchased Credit Impaired Loans [Member] | Real Estate Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, Unpaid Principal Balance, Total 1,124 1,158
Impaired Financing Receivable, Carrying Value, Total $ 171 $ 188
[1] Contractual principal balance due from customer.
[2] Principal balance on Company's books, less any direct charge offs, including interest applied to principal and unaccreted discount or premium.