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Fair Value Fair Value (Assets and liabilities measured at fair value on a nonrecurring basis) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans Held-for-sale, Fair Value Disclosure | $ 6,722 | $ 10,413
Loans Receivable, Fair Value Disclosure | 5,197,158 | 5,178,439
Other Assets, Fair Value Disclosure | 5,185,883 | 5,161,919
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans Held-for-sale, Fair Value Disclosure | 6,722 | 10,413
Loans Receivable, Fair Value Disclosure | 6,956 | 10,537
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans Receivable, Fair Value Disclosure | 5,190,202 | 5,167,902
Other Assets, Fair Value Disclosure | 5,185,883 | 5,161,919
Fair Value, Measurements, Nonrecurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans Receivable, Fair Value Disclosure | 4,319 | 5,983
Servicing Asset at Fair Value, Amount | 6,892 | 6,769
Other Assets, Fair Value Disclosure | 6,828 | 6,897
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Servicing Asset at Fair Value, Amount | 6,892 | 6,769
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans Receivable, Fair Value Disclosure | 4,319 | 5,983
Other Assets, Fair Value Disclosure | 6,828 | 6,897
Commercial Real Estate Portfolio Segment [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans Receivable, Fair Value Disclosure | 2,647 | 3,057
Commercial Real Estate Portfolio Segment [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans Receivable, Fair Value Disclosure | 2,647 | 3,057
Residential Real Estate [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other Assets, Fair Value Disclosure | 853 | 931
Residential Real Estate [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other Assets, Fair Value Disclosure | 853 | 931
Construction Real Estate [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other Assets, Fair Value Disclosure | 3,331 | 3,322
Construction Real Estate [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other Assets, Fair Value Disclosure | 3,331 | 3,322
Commercial Real Estate [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other Assets, Fair Value Disclosure | 2,644 | 2,644
Commercial Real Estate [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other Assets, Fair Value Disclosure | 2,644 | 2,644
Residential Real Estate [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans Receivable, Fair Value Disclosure | 1,111 | 2,385
Residential Real Estate [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans Receivable, Fair Value Disclosure | 1,111 | 2,385
Construction Real Estate - Remaining Commercial [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans Receivable, Fair Value Disclosure | 561 | 541
Construction Real Estate - Remaining Commercial [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans Receivable, Fair Value Disclosure | 561 | 541
Reported Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans Held-for-sale, Fair Value Disclosure | 6,722 | 10,413
Loans Receivable, Fair Value Disclosure | 5,263,719 | 5,221,233
Other Assets, Fair Value Disclosure | 5,252,444 | $ 5,204,713
Fair Value [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans Receivable, Fair Value Disclosure | 2,647 |
Fair Value [Member] | Residential Real Estate [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans Receivable, Fair Value Disclosure | 1,111 |
Fair Value [Member] | Construction Real Estate - Remaining Commercial [Member] | Construction Real Estate [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans Receivable, Fair Value Disclosure | $ 561 |

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