Fair Value Measurements - Change in FV (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]
Transfers of assets from level 1 to level 2	$ 0	$ 0	$ 0
Transfers of assets from level 2 to level 1	0	0	0
Transfers of liabilities from level 1 to level 2	0	0	0
Transfers of liabilities from level 2 to level 1	0	0	0
Fair Value, Option, Aggregate Differences [Abstract]
Net Gains (Losses)	519,103	390,361	457,531
Other Noninterest Income	106,465	79,541	44,670
Loans held for sale
Fair Value, Option, Aggregate Differences [Abstract]
Net Gains (Losses)	(2,970)	31,805	(19,353)
Total Changes in Fair Value	(2,970)	31,805	(19,353)
Investment in SWS common stock
Fair Value, Option, Aggregate Differences [Abstract]
Other Noninterest Income		5,985
Total Changes in Fair Value		5,985
MSR
Fair Value, Option, Aggregate Differences [Abstract]
Net Gains (Losses)	(8,844)	(7,663)	4,183
Total Changes in Fair Value	$ (8,844)	$ (7,663)	4,183
Time deposits
Fair Value, Option, Aggregate Differences [Abstract]
Other Noninterest Income			12
Total Changes in Fair Value			$ 12

Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

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Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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Amount of transfers of liabilities measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

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For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

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The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.3(a))
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13(h))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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Represents the total of noninterest income derived from certain activities and assets including (for example): (1) venture capital investments; (2) bank owned life insurance; (3) foreign currency transactions; and (4) mortgage servicing rights.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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