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Investment Securities Narrative (Details) $ in Thousands |  | 6 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 01, 2018 USD ($) | Jun. 30, 2018 USD ($) security | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($)
Schedule of Investments [Line Items] |  |  |  |
Securities pledged as collateral |  | $ 1,500,000 | $ 1,800,000 |
Amortized cost |  | 2,664,163 | 2,575,719 |
Available-for-sale Securities, Fair Value Disclosure |  | 2,593,283 | 2,547,956 |
Residential Mortgage Backed Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized cost |  | 1,035,724 | 1,132,080 |
Available-for-sale Securities, Fair Value Disclosure |  | 1,000,964 | 1,120,796 |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized cost |  | 415,460 | 405,860 |
Available-for-sale Securities, Fair Value Disclosure |  | 407,696 | 408,949 |
Equity Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized cost |  |  | 776 |
Available-for-sale Securities, Fair Value Disclosure |  |  | $ 918 |
Single-issuer Trust Preferred Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Unrealized Loss on Securities |  | $ 1,383 |  |
Number of Trust Preferred Securities | security |  | 11 |  |
External Credit Rating, BBB [Member] | Single-issuer Trust Preferred Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized cost |  | $ 3,800 |  |
Available-for-sale Securities, Fair Value Disclosure |  | $ 3,200 |  |
Not Rated By An External Agency [Member] | Single-issuer Trust Preferred Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of Trust Preferred Securities | security |  | 2 |  |
External Credit Rating, Rated Below Investment Grade [Member] | Single-issuer Trust Preferred Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized cost |  | $ 2,000 |  |
Available-for-sale Securities, Fair Value Disclosure |  | $ 1,900 |  |
Number of Trust Preferred Securities | security |  | 2 |  |
Pooled Trust Preferred Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held |  | $ 11,500 |  | $ 11,500
Subsequent Event [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Debt securities held-to-maturity, fair value | $ 641,700 |  |  |
Available-for-sale securities, transfers to held-to-maturity, Amortized Cost | 665,500 |  |  |
Subsequent Event [Member] | Residential Mortgage Backed Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Debt securities held-to-maturity, fair value | 485,300 |  |  |
Available-for-sale securities, transfers to held-to-maturity, Amortized Cost | 505,500 |  |  |
Subsequent Event [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Debt securities held-to-maturity, fair value | 156,400 |  |  |
Available-for-sale securities, transfers to held-to-maturity, Amortized Cost | $ 160,000 |  |  |

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