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Loans and Loans Held for Sale - Restructured Loans by Type of Concession (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
loan
Dec. 31, 2016
USD ($)
loan
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 36 53
Pre-Modification Outstanding Recorded Investment [1] $ 5,757 $ 14,074
Post-Modification Outstanding Recorded Investment [1] 6,142 12,192
Total Difference in Recorded Investment $ 385 $ (1,882)
Chapter 7 bankruptcy    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan [2] 26 29
Pre-Modification Outstanding Recorded Investment [1],[2] $ 770 $ 1,840
Post-Modification Outstanding Recorded Investment [1],[2] 709 1,712
Total Difference in Recorded Investment [2] $ (61) $ (128)
Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 0 1
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 250
Post-Modification Outstanding Recorded Investment [1] 0 242
Total Difference in Recorded Investment $ 0 $ (8)
Maturity date extension    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 3 13
Pre-Modification Outstanding Recorded Investment [1] $ 905 $ 6,795
Post-Modification Outstanding Recorded Investment [1] 1,406 5,197
Total Difference in Recorded Investment $ 501 $ (1,598)
Maturity date extension and interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 3 3
Pre-Modification Outstanding Recorded Investment [1] $ 1,973 $ 884
Post-Modification Outstanding Recorded Investment [1] 1,918 877
Total Difference in Recorded Investment $ (55) $ (7)
Principal deferral    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 2 7
Pre-Modification Outstanding Recorded Investment [1] $ 113 $ 4,305
Post-Modification Outstanding Recorded Investment [1] 113 4,164
Total Difference in Recorded Investment $ 0 $ (141)
Principal forgiveness    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 2 0
Pre-Modification Outstanding Recorded Investment [1] $ 1,996 $ 0
Post-Modification Outstanding Recorded Investment [1] 1,996 0
Total Difference in Recorded Investment $ 0 $ 0
Commercial real estate | Chapter 7 bankruptcy    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan [2] 0 1
Pre-Modification Outstanding Recorded Investment [1],[2] $ 0 $ 709
Post-Modification Outstanding Recorded Investment [1],[2] 0 646
Total Difference in Recorded Investment [2] $ 0 $ (63)
Commercial real estate | Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 0 1
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 250
Post-Modification Outstanding Recorded Investment [1] 0 242
Total Difference in Recorded Investment $ 0 $ (8)
Commercial real estate | Maturity date extension    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 1 0
Pre-Modification Outstanding Recorded Investment [1] $ 400 $ 0
Post-Modification Outstanding Recorded Investment [1] 398 0
Total Difference in Recorded Investment $ (2) $ 0
Commercial and industrial | Maturity date extension    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 1 4
Pre-Modification Outstanding Recorded Investment [1] $ 274 $ 4,756
Post-Modification Outstanding Recorded Investment [1] 777 3,334
Total Difference in Recorded Investment $ 503 $ (1,422)
Commercial and industrial | Maturity date extension and interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 2 0
Pre-Modification Outstanding Recorded Investment [1] $ 1,800 $ 0
Post-Modification Outstanding Recorded Investment [1] 1,805 0
Total Difference in Recorded Investment $ 5 $ 0
Commercial and industrial | Principal deferral    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 2 5
Pre-Modification Outstanding Recorded Investment [1] $ 113 $ 985
Post-Modification Outstanding Recorded Investment [1] 113 986
Total Difference in Recorded Investment $ 0 $ 1
Commercial construction | Maturity date extension    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 0 3
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 1,251
Post-Modification Outstanding Recorded Investment [1] 0 1,151
Total Difference in Recorded Investment $ 0 $ (100)
Commercial construction | Principal forgiveness    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 2 0
Pre-Modification Outstanding Recorded Investment [1] $ 1,996 $ 0
Post-Modification Outstanding Recorded Investment [1] 1,996 0
Total Difference in Recorded Investment $ 0 $ 0
Residential mortgage | Chapter 7 bankruptcy    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan [2] 1 7
Pre-Modification Outstanding Recorded Investment [1],[2] $ 33 $ 439
Post-Modification Outstanding Recorded Investment [1],[2] 31 413
Total Difference in Recorded Investment [2] $ (2) $ (26)
Residential mortgage | Maturity date extension    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 0 1
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 483
Post-Modification Outstanding Recorded Investment [1] 0 414
Total Difference in Recorded Investment $ 0 $ (69)
Residential mortgage | Maturity date extension and interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 0 1
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 280
Post-Modification Outstanding Recorded Investment [1] 0 279
Total Difference in Recorded Investment $ 0 $ (1)
Residential mortgage | Principal deferral    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 0 1
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 3,273
Post-Modification Outstanding Recorded Investment [1] 0 3,133
Total Difference in Recorded Investment $ 0 $ (140)
Home equity | Chapter 7 bankruptcy    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan [2] 21 19
Pre-Modification Outstanding Recorded Investment [1],[2] $ 689 $ 676
Post-Modification Outstanding Recorded Investment [1],[2] 643 643
Total Difference in Recorded Investment [2] $ (46) $ (33)
Home equity | Maturity date extension    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 1 5
Pre-Modification Outstanding Recorded Investment [1] $ 231 $ 305
Post-Modification Outstanding Recorded Investment [1] 231 298
Total Difference in Recorded Investment $ 0 $ (7)
Home equity | Maturity date extension and interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 1 2
Pre-Modification Outstanding Recorded Investment [1] $ 173 $ 604
Post-Modification Outstanding Recorded Investment [1] 113 598
Total Difference in Recorded Investment $ (60) $ (6)
Home equity | Principal deferral    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 0 1
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 47
Post-Modification Outstanding Recorded Investment [1] 0 45
Total Difference in Recorded Investment $ 0 $ (2)
Installment and other consumer | Chapter 7 bankruptcy    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan [2] 4 2
Pre-Modification Outstanding Recorded Investment [1],[2] $ 48 $ 16
Post-Modification Outstanding Recorded Investment [1],[2] 35 10
Total Difference in Recorded Investment [2] $ (13) $ (6)
[1] Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end
[2] Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.