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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

Loans and leases receivable commitments.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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

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-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

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- Definition

Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at interest rates that increase or decrease depending on certain facts or circumstances.

+ References

Reference 1: 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

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-Name Accounting Standards Codification
-Topic 942
-SubTopic 825
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
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