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Commitments and Contingencies (Details) $ / shares in Units, $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($)
Other Commitments [Line Items] |  |
VISA Class B Conversion Ratio | 1.6298 |
Commitments to extend credit: | Home equity |  |
Other Commitments [Line Items] |  |
Contractual obligations | $ 201,009 | $ 194,477
Commitments to extend credit: | Commercial real estate |  |
Other Commitments [Line Items] |  |
Contractual obligations | 47,912 | 66,901
Commitments to extend credit: | Other commitments |  |
Other Commitments [Line Items] |  |
Contractual obligations | 182,139 | 184,895
Standby letters of credit |  |
Other Commitments [Line Items] |  |
Contractual obligations | 7,057 | 7,151
Commercial letters of credit |  |
Other Commitments [Line Items] |  |
Contractual obligations | $ 842 | $ 831
Common Class B [Member] | VISA, Inc. (VISA) |  |
Other Commitments [Line Items] |  |
Investment Owned, Balance, Shares | shares | 86,605 |
Common Class A [Member] | VISA, Inc. (VISA) |  |
Other Commitments [Line Items] |  |
Share Price | $ / shares | $ 150.09 |
Investment Owned, at Fair Value | $ 21,200 |

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- Definition Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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