Fair Value Option Summary of Corporation's Mortgage Loans Held for Sale (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended		6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Mortgage Loans Held For Sale [Member]	Jun. 30, 2013 Mortgage Loans Held For Sale [Member]	Jun. 30, 2014 Mortgage Loans Held For Sale [Member]	Jun. 30, 2013 Mortgage Loans Held For Sale [Member]	Jun. 30, 2014 Mortgage Loans Held For Sale [Member] Cost [Member]	Dec. 31, 2013 Mortgage Loans Held For Sale [Member] Cost [Member]	Jun. 30, 2014 Mortgage Loans Held For Sale [Member] Fair Value	Dec. 31, 2013 Mortgage Loans Held For Sale [Member] Fair Value
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans Held-for-sale, Mortgages	$ 36,079	$ 21,351					$ 35,085	$ 21,172	$ 36,079	$ 21,351
Gain (loss) in fair values of mortgage loans held for sale			$ 518	$ (2,700)	$ 815	$ (3,400)