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Mortgage Banking and Servicing Rights (Details) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2017

Dec. 31, 2016

Dec. 31, 2015

Mortgage Banking and Servicing Rights [Abstract]

Net gain on sale of mortgage loans held for sale

$ 1,232

$ 1,831

$ 1,978

Net loan servicing income (expense) [Abstract]

Servicing fees

1,255

1,239

1,197

Late fees

84

78

88

Ancillary fees

239

322

212

Fair value adjustments

(361)

(324)

(289)

Net loan servicing income

1,217

1,315

1,208

Mortgage banking income

2,449

3,146

3,186

Loan service for benefit of others

462,000

466,000

458,000

Custodial escrow balance

1,000

1,000

1,000

Activity for capitalized mortgage servicing rights using fair value method [Roll Forward]

Fair value of MSRs, beginning of period

3,433

3,236

2,968

New servicing assets created

412

521

557

Change in fair value during the period due to [Abstract]

Time decay

^[1]

(184)

(175)

(168)

Payoffs

^[2]

(268)

(313)

(247)

Changes in valuation inputs or assumptions

^[3]

91

164

126

Fair value of MSRs, end of period

$ 3,484

$ 3,433

$ 3,236

Discount rate of servicing assets and servicing liabilities

10.10%

10.10%

10.10%

Weighted average default rates

3.03%

3.02%

2.64%

Prepayment speeds generated using Andrew Davidson Prepayment Model

10.00%

9.50%

10.00%

[1]	Represents decrease in value due to regularly scheduled loan principal payments and partial loan paydowns.
[2]	Represents decrease in value due to loans that paid off during the period.
[3]	Represents change in value resulting from market-driven changes in interest rates.

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- References

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- Definition

Amount maintained in connection with a loan servicing to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property.

+ References

No definition available.

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- Definition

Outstanding balance of underlying mortgage loans serviced for others

+ References

No definition available.

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- Definition

The net income (loss) from loan servicing activities that is included in earnings for the reporting period.

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Decrease in servicing assets subsequently measured at fair value resulting from decrease in value due to regularly scheduled loan principal payments and partial loan paydowns.

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- Definition

All amounts that are due to the servicer of a financial asset, excluding contractually specified servicing fees and late fees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 2
-Subparagraph (c)
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All amounts that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer. Depending on the servicing contract, those fees may include some or all of the difference between the interest rate collected on the asset being serviced and the rate to be paid to the beneficial owners of the asset.

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- Definition

The noninterest income derived from mortgage banking activities (fees and commissions), excluding fees earned from servicing third-party assets.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 225
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-Paragraph 1
-Subparagraph (SX 210.9-04.13 (d))
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The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

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-Publisher FASB
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-Paragraph 28
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- Definition

All amounts that are due to the servicer of a financial asset as a result of the debt holder not meeting the monthly payment terms.

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-Publisher FASB
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The adjustment to the carrying value of the rights retained or purchased to service mortgages. These adjustments are made when the estimate of the fair value is changed. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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- Definition

The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of increase (decrease) in fair value from changes in the inputs, assumptions, or model used to calculate the fair value of the contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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Decrease in servicing assets subsequently measured at fair value resulting from conveyance of servicing rights to unrelated parties.

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

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Percentage of contractually collectible principal associated with a financial asset expected not to be collected due to default by the borrower.

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

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