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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Additional Cash Flow Information
Additional cash flow information was as follows:
 
Year Ended December 31,
 
2017
 
2016
 
2015
Cash paid for interest
$
24,371

 
$
11,886

 
$
12,982

Cash paid for income tax
56,359

 
50,427

 
57,086

Significant non-cash transactions:
 
 
 
 
 
Deferred gain on sale of building and parking garage
—

 
7,099

 
—

Unsettled purchases/sales of securities
37,481

 
—

 
2,998

Loans foreclosed and transferred to other real estate owned and foreclosed assets
279

 
—

 
933

Loans to facilitate the sale of other real estate owned
—

 
753

 
20