Derivative Financial Instruments (Details) (Nondesignated, USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Derivatives, Fair Value [Line Items]
Notional Amount	$ 2,304,721
Other Asset
Derivatives, Fair Value [Line Items]
Unrealized Gain/Loss	3,479	[1]
Other Liability
Derivatives, Fair Value [Line Items]
Unrealized Gain/Loss	3,512	[1]
Treasury Options
Derivatives, Fair Value [Line Items]
Notional Amount	552,500
Treasury Options | Other Liability
Derivatives, Fair Value [Line Items]
Unrealized Gain/Loss	1,572	[1]
Eurodollar Futures
Derivatives, Fair Value [Line Items]
Notional Amount	125,000
Eurodollar Futures | Other Asset
Derivatives, Fair Value [Line Items]
Unrealized Gain/Loss	30	[1]
Treasury Futures
Derivatives, Fair Value [Line Items]
Notional Amount	25,000
Treasury Futures | Other Liability
Derivatives, Fair Value [Line Items]
Unrealized Gain/Loss	51	[1]
Forward commitments to sell loans/mortgage-backed securities
Derivatives, Fair Value [Line Items]
Notional Amount	602,000
Forward commitments to sell loans/mortgage-backed securities | Other Asset
Derivatives, Fair Value [Line Items]
Unrealized Gain/Loss	251	[1]
Forward commitments to sell loans/mortgage-backed securities | Other Liability
Derivatives, Fair Value [Line Items]
Unrealized Gain/Loss	1,440	[1]
Forward commitments to buy loans/mortgage-backed securities
Derivatives, Fair Value [Line Items]
Notional Amount	640,000
Forward commitments to buy loans/mortgage-backed securities | Other Asset
Derivatives, Fair Value [Line Items]
Unrealized Gain/Loss	1,018	[1]
Forward commitments to buy loans/mortgage-backed securities | Other Liability
Derivatives, Fair Value [Line Items]
Unrealized Gain/Loss	449	[1]
Interest rate lock commitments
Derivatives, Fair Value [Line Items]
Notional Amount	360,221
Interest rate lock commitments | Other Asset
Derivatives, Fair Value [Line Items]
Unrealized Gain/Loss	$ 2,180	[1]

[1] Derivatives in a net gain position are recorded as “Other assets” and derivatives in a net loss position are recorded as “Other liabilities” in the Consolidated Statements of Condition.