Fair Value (Fair Value of Assets Measured on a Recurring Basis) (Details) - USD ($)
$ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Debt securities |
$ 531,325
|
$ 450,785
|
| Equity securities |
47,504
|
56,444
|
| Debt and equity securities |
578,829
|
507,229
|
| U.S. Treasury securities and obligations of U.S. Government [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Debt securities |
76,269
|
93,305
|
| Corporate Bonds [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Debt securities |
121,709
|
29,442
|
| Collateralized Corporate Bank Loans [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Debt securities |
81,596
|
113,649
|
| Municipal Bonds [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Debt securities |
192,368
|
162,329
|
| Collateralized Mortgage Backed Securities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Debt securities |
59,383
|
52,060
|
| Fair Value, Inputs, Level 1 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Equity securities |
47,504
|
56,444
|
| Debt and equity securities |
47,504
|
56,444
|
| Fair Value, Inputs, Level 2 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Debt securities |
517,238
|
436,187
|
| Debt and equity securities |
517,238
|
436,187
|
| Fair Value, Inputs, Level 2 [Member] | U.S. Treasury securities and obligations of U.S. Government [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Debt securities |
76,269
|
93,305
|
| Fair Value, Inputs, Level 2 [Member] | Corporate Bonds [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Debt securities |
121,709
|
29,442
|
| Fair Value, Inputs, Level 2 [Member] | Collateralized Corporate Bank Loans [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Debt securities |
81,596
|
113,402
|
| Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Debt securities |
178,281
|
147,978
|
| Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Debt securities |
59,383
|
52,060
|
| Fair Value, Inputs, Level 3 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Debt securities |
14,087
|
14,598
|
| Debt and equity securities |
14,087
|
14,598
|
| Fair Value, Inputs, Level 3 [Member] | Collateralized Corporate Bank Loans [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Debt securities |
|
247
|
| Fair Value, Inputs, Level 3 [Member] | Municipal Bonds [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Debt securities |
$ 14,087
|
$ 14,351
|