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Loans - Restructured in Troubled Debt (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | loan | 25 | 25
Loan Balance | $ 13,099 | $ 14,626
Specific Reserve | $ 4,866 | $ 4,554
Commercial, industrial, and agricultural |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | loan | 10 | 10
Loan Balance | $ 3,401 | $ 4,577
Specific Reserve | $ 107 | $ 104
Commercial mortgages |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | loan | 15 | 15
Loan Balance | $ 9,698 | $ 10,049
Specific Reserve | $ 4,759 | $ 4,450
Residential real estate |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | loan | 0 | 0
Loan Balance | $ 0 | $ 0
Specific Reserve | $ 0 | $ 0
Consumer |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | loan | 0 | 0
Loan Balance | $ 0 | $ 0
Specific Reserve | $ 0 | $ 0
Credit cards |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | loan | 0 | 0
Loan Balance | $ 0 | $ 0
Specific Reserve | $ 0 | $ 0

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