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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Accounting Policies [Abstract] |  |  |
Right of use assets recognized during the period | $ 81,249,000 | $ 0 |
Cash Transactions: |  |  |
Interest paid | 68,403,000 | 34,909,000 |
Income taxes paid, net | 550,000 | 425,000 |
Noncash Transactions: |  |  |
Loans charged-off to the allowance for loan losses | 6,068,000 | 8,669,000 |
Loans foreclosed upon and transferred to other real estate owned | 624,000 | 232,000 |
Loans foreclosed upon and transferred to other assets | $ 87,000 | $ 392,000 |
Available-for-sale securities transferred to Held-to-Maturity |  |  | $ 179,800,000

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