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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
	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

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- Definition

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+ References

Reference 1: 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

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-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

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