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Commitments, Contingencies and Concentrations of Credit Risk (Details) - Summary of Financial Instruments - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Supply Commitment [Line Items] |  |
Off-balance sheet commitements | $ 678,137 | $ 603,112
Commercial Portfolio Segment [Member] | Supply Commitment [Member] |  |
Supply Commitment [Line Items] |  |
Off-balance sheet commitements | 344,142 | 267,865
Home Equity Line of Credit [Member] |  |
Supply Commitment [Line Items] |  |
Off-balance sheet commitements | 44,483 | 52,788
Commercial Real Estate Portfolio Segment [Member] | Supply Commitment [Member] |  |
Supply Commitment [Line Items] |  |
Off-balance sheet commitements | 254,710 | 263,395
Standby Letters of Credit [Member] |  |
Supply Commitment [Line Items] |  |
Off-balance sheet commitements | 34,114 | 18,331
Overdraft Protection Lines [Member] |  |
Supply Commitment [Line Items] |  |
Off-balance sheet commitements | $ 688 | $ 733

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- Definition The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity must commit resources to supply goods or services to one or more customers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.17) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a)(19)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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