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Fair Value Measurement (Methodologies Other Than Fair Value) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Financial assets:    
BOLI $ 63,017 $ 62,113
Other investments 35,909 110,847
Other assets 106,325 101,428
Financial liabilities:    
Other liabilities 169,126 437,600
Not Measured At Fair Value | Carrying Value    
Financial assets:    
BOLI 63,017 62,113
Other investments 2,889 58,546
Other assets 37,745 34,020
Financial liabilities:    
Other liabilities 22,303 21,154
Not Measured At Fair Value | Carrying Value | Senior Notes    
Financial liabilities:    
Debt 250,000 250,000
Not Measured At Fair Value | Carrying Value | Mortgage Loans    
Financial liabilities:    
Debt 39,762 40,460
Not Measured At Fair Value | Carrying Value | Line of Credit    
Financial liabilities:    
Debt 0 123,000
Not Measured At Fair Value | Level 3 | Fair Value    
Financial assets:    
BOLI 63,017 62,113
Other investments 2,889 69,095
Other assets 37,411 33,742
Financial liabilities:    
Other liabilities 22,303 21,154
Not Measured At Fair Value | Level 3 | Fair Value | Senior Notes    
Financial liabilities:    
Debt 263,943 273,153
Not Measured At Fair Value | Level 3 | Fair Value | Mortgage Loans    
Financial liabilities:    
Debt 39,762 40,460
Not Measured At Fair Value | Level 3 | Fair Value | Line of Credit    
Financial liabilities:    
Debt $ 0 $ 123,000