Consolidated Statements of Stockholders’ Equity - USD ($) $ in Thousands	Delta Trust [Member] Common Stock [Member]	Delta Trust [Member] Additional Paid-in Capital [Member]	Delta Trust [Member]	Community First Bancshares, Inc. [Member] Preferred Stock [Member]	Community First Bancshares, Inc. [Member] Common Stock [Member]	Community First Bancshares, Inc. [Member] Additional Paid-in Capital [Member]	Community First Bancshares, Inc. [Member]	Liberty [Member] Common Stock [Member]	Liberty [Member] Additional Paid-in Capital [Member]	Liberty [Member]	Ozark Trust & Investment Corporation [Member] Common Stock [Member]	Ozark Trust & Investment Corporation [Member] Additional Paid-in Capital [Member]	Ozark Trust & Investment Corporation [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2012															$ 165	$ 96,587	$ 257	$ 309,053	$ 406,062
Comprehensive income:
Net income																		23,231	23,231
Change in unrealized depreciation on available-for-sale securities, net of income taxes																	(3,259)		(3,259)
Comprehensive income																			19,972
Stock issued as bonus shares															1	228			229
Vesting bonus shares, net of forfeitures																1,390			1,390
Stock issued for employee stock purchase plan																126			126
Exercise of stock options																604			604
Stock granted under stock-based compensation plans																27			27
Stock issued for employee stock purchase plan																(23)			(23)
Repurchase of common stock – (419,564 shares)															(4)	(10,844)			(10,848)
Cash Dividends																		(13,707)	(13,707)
Balance at Dec. 31, 2013															162	88,095	(3,002)	318,577	403,832
Comprehensive income:
Net income																		35,688	35,688
Change in unrealized depreciation on available-for-sale securities, net of income taxes																	1,666		1,666
Comprehensive income																			37,354
Stock issued as bonus shares															1	441			442
Vesting bonus shares, net of forfeitures																1,423			1,423
Stock issued for employee stock purchase plan																118			118
Exercise of stock options															2	1,674			1,676
Stock issued for employee stock purchase plan																(213)			(213)
Stock issued for acquisition	$ 16	$ 65,030	$ 65,046
Cash Dividends																		(15,359)	(15,359)
Balance at Dec. 31, 2014															181	156,568	(1,336)	338,906	494,319
Comprehensive income:
Net income																		74,364	74,364
Change in unrealized depreciation on available-for-sale securities, net of income taxes																	(1,329)		(1,329)
Comprehensive income																			73,035
Stock issued as bonus shares															1	1,832			1,833
Vesting bonus shares, net of forfeitures																2,552			2,552
Stock issued for employee stock purchase plan																226			226
Exercise of stock options															1	1,611			1,612
Stock granted under stock-based compensation plans																1,466			1,466
Stock issued for employee stock purchase plan																(142)			(142)
Stock issued for acquisition				$ 30,852	$ 65	$ 268,277	$ 299,194	$ 52	$ 212,124	$ 212,176	$ 3	$ 17,864	$ 17,867
Dividends on preferred stock																		(257)	(257)
Cash Dividends																		(27,026)	(27,026)
Balance at Dec. 31, 2015														$ 30,852	$ 303	$ 662,378	$ (2,665)	$ 385,987	$ 1,076,855