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Fair Value Option Summary of Corporation's Mortgage Loans Held for Sale (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Fair Value, Option, Quantitative Disclosures [Line Items]          
Loans Held-for-sale, Mortgages $ 26,937   $ 26,937   $ 17,522
Mortgage Loans Held For Sale [Member]          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Gain (loss) in fair values of mortgage loans held for sale 531 $ (472) 309 $ 343  
Mortgage Loans Held For Sale [Member] | Cost [Member]          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Loans Held-for-sale, Mortgages 26,186   26,186   17,080
Mortgage Loans Held For Sale [Member] | Fair Value [Member]          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Loans Held-for-sale, Mortgages $ 26,937   $ 26,937   $ 17,522