Fair Value Measurement (Methodologies Other Than Fair Value) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Financial assets:
BOLI	$ 59,664	$ 57,213
Other investments	81,759	79,133
Other assets	98,045	103,966
Financial liabilities:
Debt	348,116	347,858
Total other liabilities	187,468	202,303
Not Measured At Fair Value [Member] | Carrying Value [Member]
Financial assets:
BOLI	59,664	57,213
Other investments	50,032	48,522
Other assets	28,135	24,215
Financial liabilities:
Total other liabilities	16,331	14,897
Not Measured At Fair Value [Member] | Carrying Value [Member] | Senior notes due 2023 [Member]
Financial liabilities:
Debt	250,000	250,000
Not Measured At Fair Value [Member] | Carrying Value [Member] | Revolving Credit Facility [Member]
Financial liabilities:
Debt	100,000	100,000
Not Measured At Fair Value [Member] | Level 3 [Member] | Fair Value [Member]
Financial assets:
BOLI	59,664	57,213
Other investments	54,325	51,646
Other assets	28,086	24,193
Financial liabilities:
Total other liabilities	16,331	14,893
Not Measured At Fair Value [Member] | Level 3 [Member] | Fair Value [Member] | Senior notes due 2023 [Member]
Financial liabilities:
Debt	278,913	261,308
Not Measured At Fair Value [Member] | Level 3 [Member] | Fair Value [Member] | Revolving Credit Facility [Member]
Financial liabilities:
Debt	$ 100,000	$ 100,000