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Off-Balance Sheet Loan Commitments - Summary of Financial Instruments with Off-Balance Sheet Risk - (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Unused Lines of Credit |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |
Financial instruments, off balance sheet risk, Fixed Rate | $ 78,708 | $ 133,634
Financial instruments, off balance sheet risk, Variable Rate | 418,319 | 242,236
Financial instruments, off balance sheet risk | 497,027 | 375,870
Mortgage Warehouse Commitments |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |
Financial instruments, off balance sheet risk, Variable Rate | 305,053 | 239,632
Financial instruments, off balance sheet risk | 305,053 | 239,632
Standby Letters of Credit |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |
Financial instruments, off balance sheet risk, Fixed Rate | 2,148 | 1,998
Financial instruments, off balance sheet risk, Variable Rate | 5,641 | 8,169
Financial instruments, off balance sheet risk | $ 7,789 | $ 10,167

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- Definition Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at stated interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=108315417&loc=d3e61044-112788 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108315417&loc=d3e61082-112788 + Details
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