Capital Stock (Details				1 Months Ended	10 Months Ended	12 Months Ended
	Feb. 08, 2018	Feb. 27, 2015 shares	Jul. 23, 2012 shares	Feb. 28, 2018	Dec. 31, 2016	Feb. 18, 2016	Dec. 31, 2018 shares	Apr. 19, 2018 shares	Apr. 18, 2018 shares	Dec. 31, 2017 shares	Feb. 27, 2009 USD ($) $ / shares shares
Subsidiary or Equity Method Investee [Line Items]
Preferred stock, shares authorized (in shares)											40,040,000
Preferred stock, par or stated value per share (in dollars per share) | $ / shares											$ 0.01
Stock split, conversion ratio	2			2
Common stock, shares authorized (in shares)							175,000,000	175,000,000	120,000,000	120,000,000
Dividend rate (as percent)					9.00%	1.00%
Stock repurchase program, number of shares authorized to be repurchased (in shares)			1,700,000
Shares outstanding (as percent)			2.00%
Number of additional shares that can be repurchased (in shares)			308,272
Community First Bancshares Inc. | Preferred Stock
Subsidiary or Equity Method Investee [Line Items]
Equity interest issued or issuable (in shares)		30,852
Maximum
Subsidiary or Equity Method Investee [Line Items]
Preferred stock, liquidation preference, value | $											$ 80,000,000