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Fair Value Measurements Fair Value Measurements, Financial Instruments Measured On a Recurring Basis, Quantitative Information (Details) - Fair Value, Measurements, Recurring [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Available for sale securities [Member] | Municipal and other tax-exempt securities [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Par Value $ 6,195 $ 10,370
Amortized Cost 6,163 10,311
Fair Value $ 5,712 $ 9,610
Valuation Techniques Discounted cash flows [1] Discounted cash flows [2]
Significant Unobservable Input Interest rate spread Interest rate spread
Discount Rate, Minimum 5.91% [3] 5.47% [4]
Discount Rate, Maximum 6.21% [3] 5.77% [4]
Discount Rate, Weighted Average 6.16% [3] 5.73% [4]
Fair Value As Percentage of Par Value or Principal Balance, Minimum [5] 90.00% 92.34%
Fair Value As Percentage of Par Value or Principal Balance, Maximum [5] 93.40% 92.93%
Fair Value As Percentage of Par Value or Unpaid Principal Balance, Weighted Average [5] 92.20% 92.67%
Investment Grade Tax Exempt Securities Yield Spread Over Comparable Securities, Minimum 467 499
Investment Grade Tax Exempt Securities Yield Spread Over Comparable Securities, Maximum 525 541
Available for sale securities [Member] | Other debt securities [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Par Value $ 4,400 $ 4,400
Amortized Cost 4,400 4,400
Fair Value $ 4,152 $ 4,151
Valuation Techniques Discounted cash flows [1] Discounted cash flows [2]
Significant Unobservable Input Interest rate spread Interest rate spread
Discount Rate, Minimum 6.01% [6] 5.80% [7]
Discount Rate, Maximum 6.26% [6] 5.92% [7]
Discount Rate, Weighted Average 6.23% [6] 5.90% [7]
Fair Value As Percentage of Par Value or Principal Balance, Minimum 94.34% [5] 94.33% [8]
Fair Value As Percentage of Par Value or Principal Balance, Maximum 94.36% [5] 94.34% [8]
Fair Value As Percentage of Par Value or Unpaid Principal Balance, Weighted Average 94.36% [5] 94.34% [8]
Average Yields On Comparable Short-term Taxable Securities 1.00% 1.00%
Residential mortgage loans held for sale [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Amortized Cost $ 12,431 $ 8,395
Fair Value $ 11,617 $ 7,874
Valuation Techniques Quoted prices of loans sold in securitization transactions, with a liquidity discount applied Quoted prices of loans sold in securitization transactions, with a liquidity discount applied
Significant Unobservable Input Liquidity discount applied to the market value of mortgage loans qualifying for sale to U.S. government agencies Liquidity discount applied to the market value of mortgage loans qualifying for sale to U.S. government agencies
Fair Value As Percentage of Par Value or Principal Balance, Minimum 93.45% 93.79%
Fair Value As Percentage of Par Value or Principal Balance, Maximum 93.45% 93.79%
Fair Value As Percentage of Par Value or Unpaid Principal Balance, Weighted Average 93.45% 93.79%
[1] Discounted cash flows developed using discount rates primarily based on reference to interest rate spreads for comparable securities of similar duration and credit rating as determined by the nationally-recognized rating agencies, adjusted for lack of trading volume.
[2] Discounted cash flows developed using discount rates primarily based on reference to interest rate spreads for comparable securities of similar duration and credit rating as determined by the nationally-recognized rating agencies, adjusted for lack of trading volume.
[3] Interest rate yields used to value investment grade tax-exempt securities represent a spread of 467 to 525 basis points over average yields for comparable tax-exempt securities.
[4] Interest rate yields used to value investment grade tax-exempt securities represent a spread of 499 to 541 basis points over average yields for comparable tax-exempt securities.
[5] Represents fair value as a percentage of par value
[6] Interest rate yields used to value investment grade taxable securities based on comparable short-term taxable securities which are generally yielding approximately 1%.
[7] Interest rate yields used to value investment grade taxable securities based on comparable short-term taxable securities which are generally yielding less than 1%.
[8] Represents fair value as a percentage of par value