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Other Noninterest Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Other Noninterest Expense [Abstract]        
Advertising $ 3,910 $ 2,859 $ 11,971 $ 7,909
Ad valorem and franchise taxes 3,387 2,268 9,942 6,911
Printing and supplies 1,421 1,134 3,929 3,310
Insurance expense 671 803 2,295 2,467
Travel expense 1,226 1,022 3,635 3,050
Entertainment and contributions 2,322 1,686 6,087 5,319
Tax credit investment amortization 1,212 861 3,637 4,437
Loss share termination     6,603
Other miscellaneous 7,611 11,746 19,958 22,158
Total other noninterest expense $ 21,760 $ 22,379 $ 68,057 $ 55,561