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Off-Balance Sheet Loan Commitments - Summary of Financial Instruments with Off-Balance Sheet Risk - (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Commitments to Make Loans |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |
Financial instruments, off balance sheet risk, Fixed Rate |  | $ 7,345
Financial instruments, off balance sheet risk, Variable Rate |  | 7,580
Unused Lines of Credit |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |
Financial instruments, off balance sheet risk, Fixed Rate | $ 133,634 | 109,611
Financial instruments, off balance sheet risk, Variable Rate | 242,236 | 145,475
Mortgage Warehouse Commitments |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |
Financial instruments, off balance sheet risk, Fixed Rate | 9,411 | 14,387
Financial instruments, off balance sheet risk, Variable Rate | 230,221 | 219,560
Standby Letters of Credit |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |
Financial instruments, off balance sheet risk, Fixed Rate | 1,998 | 2,547
Financial instruments, off balance sheet risk, Variable Rate | $ 8,169 | $ 4,706

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=75032840&loc=d3e61044-112788 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75032840&loc=d3e61082-112788 + Details
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