Fair Value (Changes Level 3 assets (fair value, recurring)) (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Interest rate lock commitments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1	$ 2,496,000	$ 1,809,000
Total gains (losses):
Included in earnings	5,544,000	2,422,000
Purchases, sales and settlements:
Issuances	1,135,000	2,038,000
Settlements	(2,300,000)	(3,773,000)
Balance at period end	6,875,000	2,496,000
Gain (loss) on sale of loans held-for-sale	6,900,000	2,500,000
Z-Tranche Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1	4,947,000	3,298,000
Total gains (losses):
Included in earnings	0	0
Included in other comprehensive income	239,000	1,783,000
Purchases, sales and settlements:
Purchases	6,000	0
Sales	0	0
Settlements	(109,000)	(134,000)
Balance at period end	5,083,000	4,947,000
Corporate Debt Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1	0	0
Total gains (losses):
Included in earnings	0	0
Included in other comprehensive income	0	0
Purchases, sales and settlements:
Purchases	0	0
Acquired	740,000	0
Sales	0	0
Settlements	0	0
Balance at period end	$ 740,000	$ 0