Fair Value Measurements Fair Value Measurements (Summarize Changes in Level 3 Assets) (Details) (Level 3, USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	$ 49,634	$ 62,022
Assets, earnings	2,351	1,836
Assets, other comprehensive income	(1,677)	1,039
Assets, purchases	19,799	4,424
Assets, (sales)	(33,688)	(5,776)
Assets, maturities	2,607	12,604
Assets, transfers in	9,064	(1,307)
Assets, ending balance	42,876	49,634
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liabilities, beginning balance	0	20
Liabilities, earnings	0	(4)
Liabilities, other comprehensive income	0	0
Liabilities, purchases	31	4
Liabilities, (sales)	0	(20)
Liabilities, maturities	0	0
Liabilities, transfers in	0	0
Liabilities, ending balance	31	0
Equity securities available for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	4,990	2,029
Assets, earnings	8	(299)
Assets, other comprehensive income	(531)	0
Assets, purchases	14,773	3,430
Assets, (sales)	(4,381)	(170)
Assets, maturities
Assets, transfers in	0	0
Assets, ending balance	14,859	4,990
Preferred stocks
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	3,752	621
Assets, earnings	8	(299)
Assets, other comprehensive income	0	0
Assets, purchases	3,430	3,430
Assets, (sales)	(3,452)	0
Assets, maturities
Assets, transfers in	0	0
Assets, ending balance	3,738	3,752
Common stocks
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	1,238	1,408
Assets, earnings	0	0
Assets, other comprehensive income	(531)	0
Assets, purchases	11,343	0
Assets, (sales)	(929)	(170)
Assets, maturities
Assets, transfers in	0	0
Assets, ending balance	11,121	1,238
Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	42,864	59,065
Assets, earnings	49	677
Assets, other comprehensive income	(1,146)	309
Assets, purchases	84	170
Assets, (sales)	(15,244)	(4,753)
Assets, maturities	2,607	12,604
Assets, transfers in	0	0
Assets, ending balance	24,000	42,864
Corporate Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	42,864	59,065
Assets, earnings	49	677
Assets, other comprehensive income	(1,146)	309
Assets, purchases	84	170
Assets, (sales)	(15,244)	(4,753)
Assets, maturities	2,607	12,604
Assets, transfers in	0	0
Assets, ending balance	24,000	42,864
Trading Assets, Excluding Debt and Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	1,780	928
Assets, earnings	2,294	1,458
Assets, other comprehensive income	0	730
Assets, purchases	4,942	824
Assets, (sales)	(14,063)	(853)
Assets, maturities
Assets, transfers in	9,064	(1,307)
Assets, ending balance	$ 4,017	$ 1,780