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Loans - Additional Information (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) loan | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Net unamortized loan fees | $ 3,158,000 |  | $ 3,175,000
Percentage of comprised loan, commercial, industrial and agricultural loans | 38.00% |  | 37.00%
Percentage of comprised loan, commercial mortgage loans | 28.00% |  | 28.00%
Percentage of loan-to-value to business equipment | 80.00% |  |
Percentage of loan-to-value to accounts receivable | 75.00% |  |
Percentage of loan-to-value to business inventory | 60.00% |  |
Percentage of loan-to-value to real estate | 85.00% |  |
Percentage of residential real estate loan in portfolio | 31.00% |  | 31.00%
Principal balances forgiven in connection with loan restructuring | $ 0 | $ 0 | $ 0
Minimum period to be considered for loan to have defaulted | 90 days |  |
Number of loans | loan | 25 |  | 25
Modified in a troubled debt restructuring | $ 13,099,000 |  | $ 14,626,000
Financing receivable, allowance for credit losses, w-downs | $ 818,000 | $ 726,000 |
Maximum |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Maximum percentage of consumer loan and credit card in portfolio | 4.00% |  | 4.00%

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- Definition Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533 + Details
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