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Summary of Significant Accounting Policies - Narrative (Details) (USD $) | 6 Months Ended | 9 Months Ended | 12 Months Ended
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Jun. 30, 2013 | Sep. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Accounting Policies [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number |  |  | 0 |  |
Average required reserve balance |  |  | $ 48,000,000 | $ 41,000,000 |
Mortgage loans held for sale, carrying value |  |  | 1,666,000 | 25,743,000 |
Mortgage loans held for sale, contractual balance |  |  | 1,600,000 | 25,200,000 |
Expected gain on sale of mortgage loans held for sale |  |  | 28,000 | 568,000 |
Historical loss period used in estimating loan loss reserve | 48 months | 54 months | 60 months |  |
Reserve coverage period in historical losses |  |  | 1 year 248 days | 1 year 189 days |
Common stock granted to directors |  |  | 10,550 | 6,120 | 7,020
Core deposits |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Accumulated amortization of core deposit intangibles |  |  | $ 22,100,000 | $ 21,800,000 |
Directors |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Common stock granted to directors |  |  | 10,550 | 6,120 | 7,020
Commercial Loan |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Reserve coverage period in historical losses |  |  | 2 years 153 days | 2 years 215 days |

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- Definition Amount of mortgage loans held for sale. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6490309&loc=d3e48678-111004 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Permanent Investor -URI http://asc.fasb.org/extlink&oid=6520390 + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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