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Supplemental Cash Flow Disclosures - Non-cash Investing and Financing Activities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental Cash Flow Information [Abstract]
Real Estate Owned, Transfer to Real Estate Owned	$ 4,334	$ 3,067	$ 4,824
Cash paid during the year for:
Interest	40,071	21,552	19,208
Income taxes	23,826	27,902	19,950
Non-cash investing and financing activities:
Loans transferred to other real estate owned and repossessed assets	0	1,891	0
Fair value of loans transferred from held to maturity to available for sale	37,367	15,102	18,758
Gross (decrease) increase in market value adjustment to securities available for sale	(5,319)	1,983	(6,919)
Gross increase (decrease) in market value adjustment to derivatives	336	(783)	(549)
Noncash or Part Noncash Acquisition, Value of Assets Acquired	$ (21,834)	$ (37,070)	$ (501,516)
Other Significant Noncash Transaction, Consideration Received	0	245	437
Treasury stock reissued	$ 2,257	$ 2,258	$ 0
Other Significant Noncash Transaction, Value of Consideration Received	$ 0	$ 0	$ 3,769

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Cash paid for interest and income taxes during the period.

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Credit Valuation Gain Loss on Derivative Asset Gross

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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