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Loans and Leases - Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]      
Impaired loans with related allowance, recorded investment $ 3,296 $ 3,058 $ 737
Impaired loans with related allowance, principal balance 3,296 3,058 737
Impaired loans, related allowance 462 258 86
Impaired loans with related allowance, average principal balance 2,679 2,746 775
Impaired loans with related allowance, interest income recognized 125 136 34
Impaired loans without related allowance, recorded investment 18,078 10,882 13,437
Impaired loans without related allowance, principal balance 19,605 13,005 15,017
Impaired loans without related allowance, average principal balance 18,746 10,914 20,322
Impaired loans without related allowance, interest income recognized 649 349 517
Impaired loans, recorded investment 21,374 13,940 14,174
Impaired loans, principal balance 22,901 16,063 15,754
Impaired loans, average principal balance 21,425 13,660 21,097
Impaired loans, interest income recognized 774 485 551
Home equity lines and loans      
Financing Receivable, Impaired [Line Items]      
Impaired loans with related allowance, recorded investment 1,280 577  
Impaired loans with related allowance, principal balance 1,280 577  
Impaired loans, related allowance 162 19  
Impaired loans with related allowance, average principal balance 640 232  
Impaired loans with related allowance, interest income recognized 27 7  
Impaired loans without related allowance, recorded investment 3,718 1,585 2,354
Impaired loans without related allowance, principal balance 3,724 1,645 2,778
Impaired loans without related allowance, average principal balance 3,537 1,636 2,833
Impaired loans without related allowance, interest income recognized 67 38 25
Residential mortgage      
Financing Receivable, Impaired [Line Items]      
Impaired loans with related allowance, recorded investment 1,966 2,436 622
Impaired loans with related allowance, principal balance 1,966 2,436 622
Impaired loans, related allowance 272 230 73
Impaired loans with related allowance, average principal balance 1,983 2,467 639
Impaired loans with related allowance, interest income recognized 94 127 27
Impaired loans without related allowance, recorded investment 4,641 5,290 6,644
Impaired loans without related allowance, principal balance 4,728 5,529 6,970
Impaired loans without related allowance, average principal balance 4,750 4,994 7,544
Impaired loans without related allowance, interest income recognized 133 191 276
Commercial and industrial      
Financing Receivable, Impaired [Line Items]      
Impaired loans with related allowance, recorded investment   18 84
Impaired loans with related allowance, principal balance   18 84
Impaired loans, related allowance   5 5
Impaired loans with related allowance, average principal balance   19 103
Impaired loans with related allowance, interest income recognized   1 5
Impaired loans without related allowance, recorded investment 2,629 1,879 2,862
Impaired loans without related allowance, principal balance 3,803 3,613 3,692
Impaired loans without related allowance, average principal balance 3,349 2,079 8,362
Impaired loans without related allowance, interest income recognized 126 35 146
Consumer      
Financing Receivable, Impaired [Line Items]      
Impaired loans with related allowance, recorded investment 50 27 31
Impaired loans with related allowance, principal balance 50 27 31
Impaired loans, related allowance 28 4 8
Impaired loans with related allowance, average principal balance 56 28 33
Impaired loans with related allowance, interest income recognized 4 1 2
Commercial Mortgage      
Financing Receivable, Impaired [Line Items]      
Impaired loans without related allowance, recorded investment 7,007 2,128 1,577
Impaired loans without related allowance, principal balance 7,264 2,218 1,577
Impaired loans without related allowance, average principal balance 7,010 2,205 1,583
Impaired loans without related allowance, interest income recognized 320 85 70
Impaired Loans Without Related Allowance | Leases      
Financing Receivable, Impaired [Line Items]      
Impaired loans, recorded investment $ 1,200 $ 272 $ 240