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Allowance for Loan and Lease Losses - Loans Modified In Troubled Debt Restructuring (Details) - Originated Loans and Leases
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
loan
Sep. 30, 2017
USD ($)
loan
Sep. 30, 2016
USD ($)
loan
Financing Receivable, Modifications [Line Items]      
Number of Loans | loan 6 2 13
Pre-Modification Outstanding Recorded Investment $ 432 $ 162 $ 2,329
Post-Modification Outstanding Recorded Investment $ 432 $ 162 $ 2,329
Number of Loans | loan 1 [1],[2] 1 [3] 1 [4],[5]
Post-Modification Outstanding Recorded Investment $ 1,800 [1],[2] $ 55 [3] $ 1,800 [4],[5]
Commercial real estate | Other financing receivable      
Financing Receivable, Modifications [Line Items]      
Number of Loans | loan 1 [6]   1 [7]
Pre-Modification Outstanding Recorded Investment $ 50 [6]   $ 50 [7]
Post-Modification Outstanding Recorded Investment $ 50 [6]   $ 50 [7]
Number of Loans | loan 1 [2],[6]   1 [5],[7]
Post-Modification Outstanding Recorded Investment $ 1,800 [2],[6]   $ 1,800 [5],[7]
Residential real estate | Home equity      
Financing Receivable, Modifications [Line Items]      
Number of Loans | loan 5 [1] 2 [8] 10 [4]
Pre-Modification Outstanding Recorded Investment $ 382 [1] $ 162 [8] $ 1,164 [4]
Post-Modification Outstanding Recorded Investment $ 382 [1] $ 162 [8] $ 1,164 [4]
Number of Loans | loan 0 [1],[2] 1 [3],[8] 0 [4],[5]
Post-Modification Outstanding Recorded Investment $ 0 [1],[2] $ 55 [3],[8] $ 0 [4],[5]
Commercial and industrial | Other financing receivable      
Financing Receivable, Modifications [Line Items]      
Number of Loans | loan [9]     2
Pre-Modification Outstanding Recorded Investment [9]     $ 1,115
Post-Modification Outstanding Recorded Investment [9]     $ 1,115
Number of Loans | loan [5],[9]     0
Post-Modification Outstanding Recorded Investment [4],[5],[9]     $ 0
[1] Represents the following concessions: extension of term and reduction of rate.
[2] TDRs that defaulted during the three months ended September 30, 2016 that were restructured in the prior twelve months.
[3] TDRs that defaulted during the nine months ended September 30, 2017 that had been restructured in the prior twelve months.
[4] Represents the following concessions: extension of term and reduction of rate.
[5] TDRs that defaulted during the nine months ended September 30, 2016 that had been restructured in the prior twelve months.
[6] Represents the following concessions: extension of term and reduction of rate.
[7] Represents the following concessions: extension of term and reduction of rate.
[8] Represents the following concessions: extension of term and reduction of rate.
[9] Represents the following concessions: extension of term and reduction of rate.