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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Accounting Policies [Abstract] |  |  |  |  |
Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Shares Issued | [1] |  |  | 0 | 1,858,133,000
Cash Transactions: |  |  |  |  |
Interest paid |  |  |  | $ 136,154,000 | $ 56,804,000
Income taxes paid, net |  |  |  | 55,525,000 | 53,199,000
Noncash Transactions: |  |  |  |  |
Loans charged-off to the allowance for loan losses |  | $ 6,949,000 | $ 5,987,000 | 22,316,000 | 16,308,000
Loans foreclosed upon and transferred to other real estate owned |  |  |  | 2,066,000 | 3,573,000
Loans foreclosed upon and transferred to other assets |  |  |  | 1,580,000 | 641,000
Other Real Estate Sales Financed |  |  |  | 276,000 | 0
Available-for-sale securities transferred to Held-to-Maturity |  |  |  | 179,763,000 | 0
Transfer of Loans Held-for-sale to Portfolio Loans |  |  |  | $ 44,980,000 | $ 0
[1] | See Note 2 to these consolidated financial statement for more detailed information.

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