Servicing Assets - Summary of Key Assumptions in Fair Value Calculations (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Servicing Assets at Fair Value [Line Items]
Carrying amount	$ 7,666	$ 8,973	$ 8,302	$ 7,405
Residential property
Servicing Assets at Fair Value [Line Items]
Carrying amount	244	308	408	431
Servicing asset, fair value	$ 298	$ 346
Discount rates	11.25%	10.50%
Prepayment speeds	25.00%	25.60%
Weighted average remaining life	25 years 1 month 29 days	25 years 9 months 29 days
Underlying loans being serviced	$ 45,728	$ 53,253
SBA loan pool securities
Servicing Assets at Fair Value [Line Items]
Carrying amount	6,349	7,369	6,692	5,890
Servicing asset, fair value	$ 6,937	$ 7,991
Discount rates	13.25%	13.25%
Prepayment speeds	14.12%	10.50%
Weighted average remaining life	21 years 1 month 9 days	20 years 3 months 10 days
Underlying loans being serviced	$ 367,856	$ 375,233
SBA commercial term
Servicing Assets at Fair Value [Line Items]
Carrying amount	1,073	1,296	$ 1,202	$ 1,084
Servicing asset, fair value	$ 1,206	$ 1,400
Discount rates	12.75%	12.75%
Prepayment speeds	13.55%	10.60%
Weighted average remaining life	7 years 4 months 19 days	6 years 8 months 15 days
Underlying loans being serviced	$ 93,073	$ 99,672

Servicing Assets, Principal Value Of Loans Being Serviced

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- Definition

Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746

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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745

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- Definition

Fair value of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

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- Definition

Discount rate used to estimate the fair value of servicing assets and servicing liabilities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122596-111746

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- Definition

Estimated rate of prepayments of principal on servicing assets and servicing liabilities.

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- Definition

Weighted average life of financial assets and financial liabilities, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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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

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