Loans and Allowance for Loan Losses - Impaired Loans (Details) (USD $)	3 Months Ended	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014 item
Impaired loans by class
Impaired Loans with Specific Allowance, Recorded Investment	$ 7,709,000		$ 2,799,000
Impaired Loans with Specific Allowance, Related Allowance	868,000		690,000
Impaired Loans with No Specific Allowance, Recorded Investment	6,455,000		11,982,000
Total Impaired Loans, Recorded Investment	14,164,000		14,781,000
Total Impaired Loans, Unpaid Principal Balance	15,539,000		15,856,000
Impaired loans, additional information
Number of impaired loans, increase related			2
Average recorded investment in impaired loans and related interest income recognized
Average investment in impaired loans	14,560,000	7,133,000
Interest income recognized on an accrual basis on impaired loans	142,000	75,000
Interest income recognized on a cash basis on impaired loans	43,000	39,000
Commercial
Impaired loans by class
Impaired Loans with Specific Allowance, Recorded Investment	6,811,000		1,800,000
Impaired Loans with Specific Allowance, Related Allowance	554,000		362,000
Impaired Loans with No Specific Allowance, Recorded Investment	6,374,000		11,982,000
Total Impaired Loans, Recorded Investment	13,185,000		13,782,000
Total Impaired Loans, Unpaid Principal Balance	14,560,000		14,857,000
Average recorded investment in impaired loans and related interest income recognized
Average investment in impaired loans	13,580,000	6,478,000
Interest income recognized on an accrual basis on impaired loans	137,000	73,000
Interest income recognized on a cash basis on impaired loans	41,000	31,000
Number of loans, in process of foreclosure	4
Impaired loans, recorded investment, in process of foreclosure	358,000
Commercial Business
Impaired loans by class
Impaired Loans with No Specific Allowance, Recorded Investment	3,319,000		3,606,000
Total Impaired Loans, Recorded Investment	3,319,000		3,606,000
Total Impaired Loans, Unpaid Principal Balance	3,319,000		3,606,000
Impaired loans, additional information
Impaired loans, increase related, outstanding balance			3,300,000
Average recorded investment in impaired loans and related interest income recognized
Average investment in impaired loans	3,511,000
Interest income recognized on an accrual basis on impaired loans	39,000
Interest income recognized on a cash basis on impaired loans	36,000
Commercial Real Estate
Impaired loans by class
Impaired Loans with Specific Allowance, Recorded Investment	6,539,000		1,527,000
Impaired Loans with Specific Allowance, Related Allowance	453,000		260,000
Impaired Loans with No Specific Allowance, Recorded Investment			5,021,000
Total Impaired Loans, Recorded Investment	6,539,000		6,548,000
Total Impaired Loans, Unpaid Principal Balance	6,539,000		6,548,000
Impaired loans, additional information
Impaired loans, increase related, outstanding balance			5,000,000
Average recorded investment in impaired loans and related interest income recognized
Average investment in impaired loans	6,542,000	1,981,000
Interest income recognized on an accrual basis on impaired loans	13,000	15,000
Interest income recognized on a cash basis on impaired loans	4,000	20,000
Acquisition & Development
Impaired loans by class
Impaired Loans with Specific Allowance, Recorded Investment	272,000		273,000
Impaired Loans with Specific Allowance, Related Allowance	101,000		102,000
Impaired Loans with No Specific Allowance, Recorded Investment	3,055,000		3,355,000
Total Impaired Loans, Recorded Investment	3,327,000		3,628,000
Total Impaired Loans, Unpaid Principal Balance	4,702,000		4,703,000
Average recorded investment in impaired loans and related interest income recognized
Average investment in impaired loans	3,527,000	4,497,000
Interest income recognized on an accrual basis on impaired loans	85,000	58,000
Interest income recognized on a cash basis on impaired loans	1,000	11,000
Residential
Impaired loans by class
Impaired Loans with Specific Allowance, Recorded Investment	868,000		969,000
Impaired Loans with Specific Allowance, Related Allowance	284,000		298,000
Impaired Loans with No Specific Allowance, Recorded Investment	81,000
Total Impaired Loans, Recorded Investment	949,000		969,000
Total Impaired Loans, Unpaid Principal Balance	949,000		969,000
Average recorded investment in impaired loans and related interest income recognized
Average investment in impaired loans	950,000	584,000
Interest income recognized on an accrual basis on impaired loans	5,000	2,000
Interest income recognized on a cash basis on impaired loans	2,000	4,000
Home Equity
Impaired loans by class
Impaired Loans with Specific Allowance, Recorded Investment	28,000		28,000
Impaired Loans with Specific Allowance, Related Allowance	28,000		28,000
Total Impaired Loans, Recorded Investment	28,000		28,000
Total Impaired Loans, Unpaid Principal Balance	28,000		28,000
Average recorded investment in impaired loans and related interest income recognized
Average investment in impaired loans	28,000	28,000
Interest income recognized on a cash basis on impaired loans		4,000
Consumer
Impaired loans by class
Impaired Loans with Specific Allowance, Recorded Investment	2,000		2,000
Impaired Loans with Specific Allowance, Related Allowance	2,000		2,000
Total Impaired Loans, Recorded Investment	2,000		2,000
Total Impaired Loans, Unpaid Principal Balance	2,000		2,000
Average recorded investment in impaired loans and related interest income recognized
Average investment in impaired loans	2,000	43,000
Interest income recognized on a cash basis on impaired loans	$ 0

Represents the recorded investment amount of loans in process of foreclosure.

No definition available.

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- Definition

Represents the outstanding balance of an impaired loan that is primarily responsible for the overall increase of impaired loans during the period.

+ References

No definition available.

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- Definition

Represents the number of impaired loans primarily responsible for the increase in impaired loans during the period.

+ References

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Represents the number of loans in process of foreclosure.

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5258-111524

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- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

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- Definition

Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

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- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953550-111524

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Amount of allowance for credit losses related to recorded investment.

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- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

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Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

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Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

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