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Loans - Schedule of Net Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Loan Portfolio By Loan Grade [Line Items] |  |  |  |
Loans and leases receivable, gross | $ 2,855,206 | $ 2,809,197 |  |
Less: unearned discount | (4,546) | (5,162) |  |
allowance for loan losses | (21,915) | (19,473) | $ (20,346) | $ (19,704)
Net loans | 2,828,745 | 2,784,562 |  |
Commercial, industrial and agricultural |  |  |  |
Loan Portfolio By Loan Grade [Line Items] |  |  |  |
Loans and leases receivable, gross | 1,090,915 | 1,046,665 |  |
allowance for loan losses | (10,532) | (8,287) | (7,787) | (7,341)
Net loans | 1,090,915 | 1,046,665 |  |
Commercial mortgages |  |  |  |
Loan Portfolio By Loan Grade [Line Items] |  |  |  |
Loans and leases receivable, gross | 846,215 | 814,002 |  |
allowance for loan losses | (7,492) | (6,952) | (8,846) | (7,490)
Net loans | 846,215 | 814,002 |  |
Residential real estate |  |  |  |
Loan Portfolio By Loan Grade [Line Items] |  |  |  |
Loans and leases receivable, gross | 814,657 | 814,030 |  |
allowance for loan losses | (1,458) | (1,499) | (1,383) | (2,156)
Net loans | 814,657 | 814,030 |  |
Consumer |  |  |  |
Loan Portfolio By Loan Grade [Line Items] |  |  |  |
Loans and leases receivable, gross | 94,425 | 124,785 |  |
allowance for loan losses | (2,138) | (2,411) | (2,040) | (2,377)
Net loans | 94,425 | 124,785 |  |
Credit cards |  |  |  |
Loan Portfolio By Loan Grade [Line Items] |  |  |  |
Loans and leases receivable, gross | 8,683 | 7,569 |  |
allowance for loan losses | (112) | (84) | (105) | (103)
Net loans | 8,683 | 7,569 |  |
Overdrafts |  |  |  |
Loan Portfolio By Loan Grade [Line Items] |  |  |  |
Loans and leases receivable, gross | 311 | 2,146 |  |
allowance for loan losses | $ (183) | $ (240) | $ (185) | $ (237)

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