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Loans and Allowance for Loan Losses - Summary of Balance and Activity Related to Allowance for Loan Losses for Held for Investment Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	$ 10,627	$ 12,149	$ 14,162	$ 10,023	$ 10,023
Additions (reductions) to the allowance charged to expense	700	1,250	(3,488)	3,599
Recoveries on loans charged-off	93		746
Less loans charged-off				(223)	(835)
Allowance for loan losses, Ending balance	11,420	13,399	11,420	13,399	14,162
Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	6,433	9,455	8,111	5,788	5,788
Additions (reductions) to the allowance charged to expense	1,239	820	(439)	4,487
Allowance for loan losses, Ending balance	7,672	10,275	7,672	10,275	8,111
Commercial
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	3,384	2,694	6,051	4,235	4,235
Additions (reductions) to the allowance charged to expense	(115)	430	(3,435)	(888)
Recoveries on loans charged-off	93		746
Less loans charged-off				(223)	(835)
Allowance for loan losses, Ending balance	3,362	$ 3,124	3,362	$ 3,124	$ 6,051
Unallocated
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	810
Additions (reductions) to the allowance charged to expense	(424)		386
Allowance for loan losses, Ending balance	$ 386		$ 386

X

- Definition

Allowance for loan and lease losses loans acquired and (sold).

+ References

No definition available.

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- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
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- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Publisher FASB
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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.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544

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