Fair Value Measurements Fair Value Measurements (Summarize Changes in Level 3 Assets) (Details) (Level 3, USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 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	(974)	1,836
Assets, other comprehensive income	140	1,039
Assets, purchases	42	4,424
Assets, (sales)	(4,609)	5,776
Assets, maturities	388	12,604
Assets, transfers in	0	(1,307)
Assets, ending balance	43,845	49,634
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liabilities, beginning balance	0	20
Liabilities, earnings		(4)
Liabilities, other comprehensive income		0
Liabilities, purchases		4
Liabilities, (sales)		(20)
Liabilities, maturities		0
Liabilities, transfers in		0
Liabilities, ending balance		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	30	(299)
Assets, other comprehensive income	0	0
Assets, purchases	0	3,430
Assets, (sales)	22	(170)
Assets, maturities	0	0
Assets, transfers in	0	0
Assets, ending balance	4,998	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	30	(299)
Assets, other comprehensive income	0	0
Assets, purchases	0	3,430
Assets, (sales)	(22)	0
Assets, maturities	0	0
Assets, transfers in	0	0
Assets, ending balance	3,760	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	0	0
Assets, purchases	0	0
Assets, (sales)	0	(170)
Assets, maturities	0	0
Assets, transfers in	0	0
Assets, ending balance	1,238	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	12	677
Assets, other comprehensive income	140	309
Assets, purchases	42	170
Assets, (sales)	(4,587)	4,753
Assets, maturities	388	12,604
Assets, transfers in	0	0
Assets, ending balance	38,083	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	12	677
Assets, other comprehensive income	140	309
Assets, purchases	42	170
Assets, (sales)	4,587	(4,753)
Assets, maturities	388	12,604
Assets, transfers in	0	0
Assets, ending balance	38,083	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	(1,016)	1,458
Assets, other comprehensive income	0	730
Assets, purchases	0	824
Assets, (sales)	0	(853)
Assets, maturities	0	0
Assets, transfers in	0	(1,307)
Assets, ending balance	$ 764	$ 1,780