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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 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 |  |  |  | $ 82,321,000 | $ 29,311,000
Income taxes paid, net |  |  |  | 28,105,000 | 25,036,000
Noncash Transactions: |  |  |  |  |
Loans charged-off to the allowance for loan losses |  | $ 6,698,000 | $ 5,157,000 | 15,367,000 | 10,321,000
Loans foreclosed upon and transferred to other real estate owned |  |  |  | 1,505,000 | 1,520,000
Loans foreclosed upon and transferred to other assets |  |  |  | $ 950,000 | $ 446,000
[1] | See Note 2 to these consolidated financial statement for more detailed information.

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