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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash Transactions:
Interest paid	$ 34,909,000	$ 13,667,000
Income taxes paid, net	425,000	230,000
Noncash Transactions:
Loans charged-off to the allowance for loan losses	8,669,000	5,162,000
Loans foreclosed upon and transferred to other real estate owned	232,000	1,498,000
Loans foreclosed upon and transferred to other assets	$ 392,000	$ 3,000

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