| Loans Receivable (Details 6) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | 
|---|---|---|
| Financing receivables on nonaccrual status | $ 12,460 | $ 11,253 | 
| Residential Real Estate Including Home Equity [Member] | ||
| Financing receivables on nonaccrual status | 2,196 | 1,846 | 
| Consumer Loan [Member] | ||
| Financing receivables on nonaccrual status | 0 | 10 | 
| Commercial Real Estate [Member] | ||
| Financing receivables on nonaccrual status | 3,236 | 2,311 | 
| Commercial Participations Purchased [Member] | ||
| Financing receivables on nonaccrual status | 5,395 | 5,442 | 
| Commercial Loan [Member] | ||
| Financing receivables on nonaccrual status | 1,633 | 1,644 | 
| Government [Member] | ||
| Financing receivables on nonaccrual status | $ 0 | $ 0 |