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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
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Available-for-sale securities [Member] | Municipal and other tax-exempt securities      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Inputs, Asset, Par Value $ 2,050 $ 5,095 $ 5,095
Fair Value Inputs, Asset, Amortized Cost/Unpaid Principal Balance 2,033 5,067 5,068
Fair Value Inputs, Asset, Fair Value $ 2,030 $ 4,655 $ 4,802
Fair Value Measurements, Valuation Techniques Discounted cash flows [1] Discounted cash flows [2] Discounted cash flows [3]
Fair Value Measurements, Significant Unobservable Input Interest rate spread Interest rate spread Interest rate spread
Fair Value Inputs, Assets, Discount Rate, Minimum 6.69% [4] 5.98% [5] 6.60% [6]
Fair Value Inputs, Assets, Discount Rate, Maximum 6.69% [4] 5.98% [5] 6.60% [6]
Fair Value Inputs, Assets, Discount Rate, Weighted Average 6.69% [4] 5.98% [5] 6.60% [6]
Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Minimum 99.00% [7] 90.00% [8] 92.25% [9]
Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Maximum 99.00% [7] 94.90% [8] 94.76% [9]
Fair Value Inputs, Fair Value As Percentage of Par Value, Weighted Average 99.00% [7] 92.93% [8] 93.75% [9]
Investment Grade Tax Exempt Securities Yield Spread Over Comparable Securities Minimum 413 360 372
Investment Grade Tax Exempt Securities Yield Spread Over Comparable Securities Maximum 413 446 466
Available-for-sale securities [Member] | Other debt securities      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Inputs, Asset, Par Value $ 500 $ 4,400 $ 500
Fair Value Inputs, Asset, Amortized Cost/Unpaid Principal Balance 500 4,400 500
Fair Value Inputs, Asset, Fair Value $ 471 $ 4,152 $ 472
Fair Value Measurements, Valuation Techniques Discounted cash flows [1] Discounted cash flows [2] Discounted cash flows [3]
Fair Value Measurements, Significant Unobservable Input Interest rate spread Interest rate spread Interest rate spread
Fair Value Inputs, Assets, Discount Rate, Minimum 6.32% [10] 5.41% [11] 6.85% [12]
Fair Value Inputs, Assets, Discount Rate, Maximum 6.32% [10] 6.72% [11] 6.85% [12]
Fair Value Inputs, Assets, Discount Rate, Weighted Average 6.32% [10] 6.57% [11] 6.85% [12]
Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Minimum 94.36% [7] 94.31% [8] 94.39% [9]
Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Maximum 94.36% [7] 94.38% [8] 94.39% [9]
Fair Value Inputs, Fair Value As Percentage of Par Value, Weighted Average 94.36% [7] 94.37% [8] 94.39% [9]
Average Yields On Comparable Short-term Taxable Securities, Maximum 3.00% 3.00% 3.00%
Residential mortgage loans held for sale [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Inputs, Asset, Amortized Cost/Unpaid Principal Balance $ 15,025 $ 13,274 $ 12,981
Fair Value Inputs, Asset, Fair Value $ 14,252 $ 12,735 $ 12,299
Fair Value Measurements, 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 Quoted prices of loans sold in securitization transactions, with a liquidity discount applied
Fair Value Measurements, 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 a 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.
Liquidity Discount on Mortgage Loans Qualifying for Sale to US Govt Agencies 94.86% 95.94% 94.75%
[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] 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
[4] Interest rate yields used to value investment grade tax-exempt securities represent a spread of 413 basis points over average yields for comparable tax-exempt securities.
[5] Interest rate yields used to value investment grade tax-exempt securities represent a spread of 360 to 446 basis points over average yields for comparable tax-exempt securities.
[6] Interest rate yields used to value investment grade tax-exempt securities represent a spread of 372 to 466 basis points over average yields for comparable tax-exempt securities.
[7] Represents fair value as a percentage of par value.
[8] Represents fair value as a percentage of par value.
[9] Represents fair value as a percentage of par value.
[10] Interest rate yields used to value investment grade taxable securities based on comparable short-term taxable securities which are generally yielding less than 3 percent.
[11] Interest rate yields used to value investment grade taxable securities based on comparable short-term taxable securities which are generally yielding less than 3 percent.
[12] Interest rate yields used to value investment grade taxable securities based on comparable short-term taxable securities which are generally yielding less than 3 percent.