Fair Value (Changes Level 3 assets (fair value, recurring)) (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Purchases, acquired, sales and settlements:
Gains included in net gains on sale of loans held for sale	$ 16,132	$ 21,328
Interest rate lock commitments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	3,168	2,496	$ 2,496
Total gains (losses):
Included in earnings	5,808		288
Purchases, acquired, sales and settlements:
Issuances	142		5,428
Settlements	(2,254)		(5,044)
Balance at period end	6,864		3,168
Gains included in net gains on sale of loans held for sale	6,900		3,200
Z-TRANCHE Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	2,039	4,947	4,947
Total gains (losses):
Included in earnings	0		(3,038)
Included in other comprehensive income	(307)		982
Purchases, acquired, sales and settlements:
Purchases	0		6
Sales	0		(736)
Settlements	0		(122)
Balance at period end	1,732		2,039
Corporate debt securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	846	$ 0	0
Total gains (losses):
Included in earnings	121		0
Included in other comprehensive income	(91)		106
Purchases, acquired, sales and settlements:
Purchases	0		0
Acquired	0		740
Sales	(546)		0
Settlements	0		0
Balance at period end	$ 330		$ 846