Other Noninterest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other Noninterest Expense [Abstract]
Advertising	$ 3,517	$ 4,984	$ 6,043	$ 8,061
Corporate value and franchise taxes	3,577	3,519	7,017	6,555
Printing and supplies	1,688	1,330	2,974	2,508
Travel expense	1,441	1,350	2,507	2,409
Entertainment and contributions	3,193	1,982	5,711	3,765
Tax credit investment amortization	875	1,213	1,749	2,425
FDIC loss share agreement termination		6,603		6,603
Other retirement expense	(4,458)	(3,388)	(8,921)	(6,448)
Loss on restructuring of bank-owned life insurance contracts	3,240		3,240
Other miscellaneous	8,830	6,686	14,514	13,971
Total other noninterest expense	$ 21,903	$ 24,279	$ 34,834	$ 39,849