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Fair Value Measurements Fair Value Measurements, Financial Instruments Measured On a Recurring Basis, Quantitative Information (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Available for sale securities $ 8,072,014 $ 8,321,578 $ 8,383,199
Municipal and other tax-exempt securities [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Available for sale securities 4,349 27,080 28,368
Other debt securities [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Available for sale securities 25,447 25,481 4,153
Fair Value, Measurements, Recurring [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Available for sale securities 8,072,014 8,321,578 8,383,199
Residential mortgage loans held for sale 175,866 221,378 275,643
Fair Value, Measurements, Recurring [Member] | Municipal and other tax-exempt securities [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Available for sale securities 4,349 27,080 28,368
Fair Value, Measurements, Recurring [Member] | Other debt securities [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Available for sale securities 25,447 25,481 4,153
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Available for sale securities 472 5,274 8,938
Residential mortgage loans held for sale 16,838 12,299 12,100
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Municipal and other tax-exempt securities [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Available for sale securities 4,802 4,785
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other debt securities [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Available for sale securities $ 472 $ 472 $ 4,153
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Available-for-sale securities [Member] | Municipal and other tax-exempt securities [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investment Grade Tax Exempt Securities Yield Spread Over Comparable Securities Minimum   372 352
Investment Grade Tax Exempt Securities Yield Spread Over Comparable Securities Maximum 413 466 467
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Available-for-sale securities [Member] | Other debt securities [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Average Yields On Comparable Short-term Taxable Securities Maximum 3.00% 3.00% 3.00%
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential mortgage loans held for sale [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Liquidity Discount on Mortgage Loans Qualifying for Sale to US Govt Agencies 94.94% 94.75% 95.94%
Interest Rate Spread [Member] | Discounted Cash Flow [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Available-for-sale securities [Member] | Municipal and other tax-exempt securities [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Available for sale securities   $ 4,802 $ 4,785
Interest Rate Spread [Member] | Discounted Cash Flow [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Available-for-sale securities [Member] | Other debt securities [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Available for sale securities $ 472 472 4,153
Liquidity discount [Member] | Quoted prices of loans sold in securitization transactions, with a liquidity discount applied [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential mortgage loans held for sale [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Residential mortgage loans held for sale $ 16,838 $ 12,299 $ 12,100
Minimum [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Available-for-sale securities [Member] | Municipal and other tax-exempt securities [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Range of fair value as a percentage of par value 0.00% [1] 92.25% [2] 92.25% [3]
Range of Interest Rates used to Value Securities 0.00% [4] 6.60% [5] 6.05% [6]
Minimum [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Available-for-sale securities [Member] | Other debt securities [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Range of fair value as a percentage of par value 94.36% [1] 94.39% [2] 94.38% [3]
Range of Interest Rates used to Value Securities 6.37% [4] 6.85% [5] 6.65% [6]
Maximum [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Available-for-sale securities [Member] | Municipal and other tax-exempt securities [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Range of fair value as a percentage of par value 0.00% [1] 94.76% [2] 95.02% [3]
Range of Interest Rates used to Value Securities 0.00% [4] 6.60% [5] 6.05% [6]
Maximum [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Available-for-sale securities [Member] | Other debt securities [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Range of fair value as a percentage of par value 94.36% [1] 94.39% [2] 94.38% [3]
Range of Interest Rates used to Value Securities 6.37% [4] 6.85% [5] 6.73% [6]
Weighted Average [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Available-for-sale securities [Member] | Municipal and other tax-exempt securities [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Range of fair value as a percentage of par value 0.00% [1] 93.75% [2] 93.91% [3]
Range of Interest Rates used to Value Securities 0.00% [4] 6.60% [5] 6.05% [6]
Weighted Average [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Available-for-sale securities [Member] | Other debt securities [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Range of fair value as a percentage of par value 94.36% [1] 94.39% [2] 94.38% [3]
Range of Interest Rates used to Value Securities 6.37% [4] 6.85% [5] 6.72% [6]
[1] Represents fair value as a percentage of par value.
[2] Represents fair value as a percentage of par value.
[3] Represents fair value as a percentage of par value.
[4] 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.
[5] 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.
[6] 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.