Fair Value Measurements Fair Value Measurements (Summarize Changes in Level 3 Assets) (Details) (Level 3, USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	$ 35,939,000	$ 49,634,000
Assets, earnings	(310,000)	2,304,000
Assets, other comprehensive income	(1,666,000)	(4,622,000)
Assets, purchases	72,173,000	19,953,000
Assets, (sales)	0	(33,698,000)
Assets, maturities	1,673,000	3,429,000
Assets, transfers in	(17,357,000)	5,797,000
Assets, ending balance	87,106,000	35,939,000
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liabilities, beginning balance	0	0
Liabilities, earnings	0	(20,000)
Liabilities, other comprehensive income	0	0
Liabilities, purchases	0	31,000
Liabilities, (sales)	0	(11,000)
Liabilities, maturities	0	0
Liabilities, transfers in	0	0
Liabilities, ending balance	0	0
Equity securities available for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	14,454,000	4,990,000
Assets, earnings	(48,000)	(17,000)
Assets, other comprehensive income	(1,846,000)	(911,000)
Assets, purchases	0	14,773,000
Assets, (sales)	0	(4,381,000)
Assets, transfers in	0	0
Assets, ending balance	12,560,000	14,454,000
Preferred stocks
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	3,713,000	3,752,000
Assets, earnings	(48,000)	(17,000)
Assets, other comprehensive income	0	0
Assets, purchases	0	3,430,000
Assets, (sales)	0	(3,452,000)
Assets, transfers in	0	0
Assets, ending balance	3,665,000	3,713,000
Common stocks
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	10,741,000	1,238,000
Assets, earnings	0	0
Assets, other comprehensive income	(1,846,000)	(911,000)
Assets, purchases	0	11,343,000
Assets, (sales)	0	(929,000)
Assets, transfers in	0	0
Assets, ending balance	8,895,000	10,741,000
Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	20,765,000	42,864,000
Assets, earnings	15,000	47,000
Assets, other comprehensive income	180,000	(3,711,000)
Assets, purchases	0	238,000
Assets, (sales)	0	(15,244,000)
Assets, maturities	1,673,000	3,429,000
Assets, transfers in	(17,357,000)	0
Assets, ending balance	1,930,000	20,765,000
Corporate Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	20,765,000	42,864,000
Assets, earnings	15,000	47,000
Assets, other comprehensive income	180,000	(3,711,000)
Assets, purchases	0	238,000
Assets, (sales)	0	(15,244,000)
Assets, maturities	1,673,000	3,429,000
Assets, transfers in	(17,357,000)	0
Assets, ending balance	1,930,000	20,765,000
Trading Assets, Excluding Debt and Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	720,000	1,780,000
Assets, earnings	(277,000)	2,274,000
Assets, other comprehensive income	0	0
Assets, purchases	72,173,000	4,942,000
Assets, (sales)	0	(14,073,000)
Assets, transfers in	0	5,797,000
Assets, ending balance	$ 72,616,000	$ 720,000