Loans and Allowance for Loan Losses - Impaired Loans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment, Total	$ 15,096	$ 19,124	$ 16,618
Unpaid Principal Balance, Total	22,306	26,341	22,629
Related Allowance, Total	514	917	1,016
Average Recorded Balance, Total	15,858	20,318	18,652
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	11,591	12,512	11,578
Unpaid Principal Balance	16,521	16,899	16,320
Related Allowance	0	0	0
Average Recorded Balance	11,585	14,021	12,650
Recorded Investment	777	3,663	2,250
Unpaid Principal Balance	1,901	5,553	2,256
Related Allowance	186	838	742
Average Recorded Balance	1,513	2,988	2,903
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	55	202	74
Unpaid Principal Balance	226	255	391
Related Allowance	0	0	0
Average Recorded Balance	65	208	445
Recorded Investment	192	258	127
Unpaid Principal Balance	192	258	127
Related Allowance	116	73	51
Average Recorded Balance	159	258	169
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	1,335	1,233	1,316
Unpaid Principal Balance	1,477	1,371	1,457
Related Allowance	0	0	0
Average Recorded Balance	1,325	1,482	1,241
Recorded Investment	359	21	372
Unpaid Principal Balance	359	82	372
Related Allowance	212	6	223
Average Recorded Balance	366	11	148
Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	628	980	711
Unpaid Principal Balance	1,376	1,563	1,408
Related Allowance	0	0	0
Average Recorded Balance	670	1,045	874
Recorded Investment	0	0	0
Unpaid Principal Balance	0	0	0
Related Allowance	0	0	0
Average Recorded Balance	0	0	0
Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	97	190	127
Unpaid Principal Balance	192	263	235
Related Allowance	0	0	0
Average Recorded Balance	112	192	158
Recorded Investment	0	0	0
Unpaid Principal Balance	0	0	0
Related Allowance	0	0	0
Average Recorded Balance	0	0	0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	62	65	63
Unpaid Principal Balance	62	97	63
Related Allowance	0	0	0
Average Recorded Balance	63	113	64
Recorded Investment	0	0	0
Unpaid Principal Balance	0	0	0
Related Allowance	0	0	0
Average Recorded Balance	$ 0	$ 0	$ 0

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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)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses.

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Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

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-Publisher FASB

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