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Investment Securities - Narrative (Details) | 12 Months Ended
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Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Schedule of Investments [Line Items] |  |  |
Other than Temporary Impairment Losses, Investments | $ 0 | $ 0 | $ 17,000
Amortized cost of securities available-for-sale | 1,436,714,000 | 1,299,980,000 |
Securities held-to-maturity, at amortized cost (fair value of $151,428 and $143,490 at December 31, 2015 and 2014, respectively) | 149,302,000 | 140,562,000 |
Federal home loan bank stock | 50,100,000 | 50,086,000 |
Federal reserve bank stock | $ 8,200,000 | 8,226,000 |
Investment Securities average remaining life | 4 years 9 months 14 days |  |
Federal Home Loan Bank (FHLB) advance borrowings | $ 1,072,000,000 | 1,205,000,000 |
Money pledged for government and trust department deposits | 429,000,000 | 513,000,000 |
Money pledged to secure repurchase agreements | 622,000,000 | 664,000,000 |
Money Pledged as Collateral for FHLB Advance Borrowings | $ 21,000,000 | 28,000,000 |
Schedule of Repurchase Agreement Counterparties with Whom Repurchase Agreements Exceed 10 Percent of Stockholders' Equity [Table Text Block] | 0 |  |
Percentage of amount greater than shareholder's equity | 10.00% |  |
Held-to-maturity Securities, Sold Security, Cost Basis of Securities Sold | 3056 |  |
Held-to-maturity Securities, Sold Security, Realized Gain (Loss) | $ 88,000 |  |
Proceeds from sale of investment securities |  |  | 75,000,000
Available-for-sale Securities, Gross Realized Gains |  | 22,000 |
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments |  | $ 1,200,000 | $ 0
U.S. Treasury and sponsored entities callable notes |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale securities | $ 527,600,000 |  |
Securities sold at a gain [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Gross Realized Gains (Losses), Cost Basis (Methodology) of Securities Sold |  | 187000 |
Securities sold at a loss [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Gross Realized Gains (Losses), Cost Basis (Methodology) of Securities Sold |  | 174.1 |
U.S. Government sponsored entity asset-backed securities |  |  |
Schedule of Investments [Line Items] |  |  |
Asset-backed securities mortgage portfolio, maturity term | 15 years |  |
Amortized cost of securities available-for-sale | $ 907,989,000 | $ 751,974,000 |
Securities held-to-maturity, at amortized cost (fair value of $151,428 and $143,490 at December 31, 2015 and 2014, respectively) | 101,112,000 | $ 140,562,000 |
Residential mortgage-backed securities |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized cost of securities available-for-sale | 569,000,000 |  |
Securities held-to-maturity, at amortized cost (fair value of $151,428 and $143,490 at December 31, 2015 and 2014, respectively) | 0 |  |
Collateralized mortgage-backed securities |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized cost of securities available-for-sale | 339,000,000 |  |
Securities held-to-maturity, at amortized cost (fair value of $151,428 and $143,490 at December 31, 2015 and 2014, respectively) | $ 101,100,000 |  |
Minimum | U.S. Treasury and sponsored entities callable notes |  |  |
Schedule of Investments [Line Items] |  |  |
Available for Sale Securities, Debt Maturities, Term. | 1 |  |
Maximum | U.S. Treasury and sponsored entities callable notes |  |  |
Schedule of Investments [Line Items] |  |  |
Available for Sale Securities, Debt Maturities, Term. | 7 |  |

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