Mortgage Banking Activities, Components of Loans Held For Sale (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Schedule of Residential Mortgage Loans Held For Sale [Line Items]
Components of Residential Mortgages Held For Sale Gross, Fair Value	$ 373,253	$ 200,546	$ 230,511	$ 373,253	$ 230,511
Residential Mortgage Loans Held For Sale [Member]
Schedule of Residential Mortgage Loans Held For Sale [Line Items]
Residential Mortgage Loans Held For Sale Unpaid Principal Balance/Notional	360,126	192,266	220,800	360,126	220,800
Components of Residential Mortgages Held For Sale Gross, Fair Value	366,183	193,584	228,926	366,183	228,926
Number of days for past due loans (in days)	90 days	90 days	90 days
Residential mortgage loans held for sale, nonperforming	0	0	0	0	0
Credit losses recognized on residential mortgage loans held for sale				0	0
Residential Mortgage Loan Commitments [Member]
Schedule of Residential Mortgage Loans Held For Sale [Line Items]
Residential Mortgage, Derivatives, Notional	537,975	258,873	351,196	537,975	351,196
Components of Residential Mortgages Held For Sale Gross, Fair Value	8,480	2,656	10,948	8,480	10,948
Minimum Number of Days Outstanding For Residential Mortgage Commitments	60 days	60 days	60 days
Maximum Number of Days Outstanding For Residential Mortgage Commitments	90 days	90 days	90 days
Forward Sales Contracts [Member]
Schedule of Residential Mortgage Loans Held For Sale [Line Items]
Residential Mortgage, Derivatives, Notional	790,131	435,867	560,069	790,131	560,069
Components of Residential Mortgages Held For Sale Gross, Fair Value	$ (1,410)	$ 4,306	$ (9,363)	$ (1,410)	$ (9,363)
Minimum Number of Days for Delivery of Forward Sales Contracts	60 days	60 days	60 days
Maximum Number of Days for Delivery of Forward Sales Contracts	90 days	90 days	90 days