CONSOLIDATED CONDENSED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Retained Earnings [Member]	Treasury Shares [Member]	Accumulated Other Comprehensive Income [Member]	Calculated under Revenue Guidance in Effect before Topic 606 [Member]	Calculated under Revenue Guidance in Effect before Topic 606 [Member] Common Stock [Member]	Calculated under Revenue Guidance in Effect before Topic 606 [Member] Retained Earnings [Member]	Calculated under Revenue Guidance in Effect before Topic 606 [Member] Treasury Shares [Member]	Calculated under Revenue Guidance in Effect before Topic 606 [Member] Accumulated Other Comprehensive Income [Member]	Difference between Revenue Guidance in Effect before and after Topic 606 [Member]	Difference between Revenue Guidance in Effect before and after Topic 606 [Member] Retained Earnings [Member]	Difference between Revenue Guidance in Effect before and after Topic 606 [Member] Accumulated Other Comprehensive Income [Member]	Columbus First Bancorp, Inc. [Member]	Columbus First Bancorp, Inc. [Member] Common Stock [Member]
Balance Beginning (in shares) at Dec. 31, 2016		9,998,025
Balance beginning at Dec. 31, 2016	$ 142,944	$ 76,490	$ 80,736	$ (11,665)	$ (2,617)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9,355		9,355
Other comprehensive income, net of taxes	1,831				1,831
Dividend Reinvestment and Stock Purchase Plan (in shares)		13,057
Dividend Reinvestment and Stock Purchase Plan	266	$ 266
Exercise of stock options (in shares)		3,398
Exercise of stock options	51	$ 51
Adjustments to Additional Paid in Capital, Share-based Compensation, Stock Options, Requisite Service Period Recognition	1	$ 1
Compensation expense relating to restricted stock (in shares)		4,027
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition	69	$ 69
Common stock dividends, $0.48 per share	(4,804)		(4,804)
Balance Ending (in shares) at Sep. 30, 2017		10,018,507
Balance ending at Sep. 30, 2017	149,713	$ 76,877	85,287	(11,665)	(786)
Balance Beginning (in shares) at Jun. 30, 2017		10,014,004
Balance beginning at Jun. 30, 2017	147,927	$ 76,785	83,782	(11,665)	(975)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,106		3,106
Other comprehensive income, net of taxes	189				189
Dividend Reinvestment and Stock Purchase Plan (in shares)		4,503
Dividend Reinvestment and Stock Purchase Plan	86	$ 86
Compensation expense relating to restricted stock (in shares)		0
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition	6	$ 6
Common stock dividends, $0.48 per share	(1,601)		(1,601)
Balance Ending (in shares) at Sep. 30, 2017		10,018,507
Balance ending at Sep. 30, 2017	149,713	$ 76,877	85,287	(11,665)	(786)
Balance Beginning (in shares) at Dec. 31, 2017		10,023,059					10,023,059
Balance beginning at Dec. 31, 2017	150,271	$ 76,977	87,826	$ (11,665)	(2,867)	$ 150,271	$ 76,977	$ 87,301	$ (11,665)	$ (2,342)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9,652		9,652
Other comprehensive income, net of taxes	(4,566)				(4,566)
Dividend Reinvestment and Stock Purchase Plan (in shares)		15,592
Dividend Reinvestment and Stock Purchase Plan	299	$ 299
Exercise of stock options (in shares)		2,631													3,253,060
Exercise of stock options	33	$ 33													$ 63,598
Stock Issued During Period, Value, Acquisitions														$ 63,598
Compensation expense relating to restricted stock (in shares)		10,634
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition	89	$ 89
Common stock dividends, $0.48 per share	(5,861)		(5,861)
Cumulative effect of changes in accounting principles | Accounting Standards Update 2014-09 [Member]											$ (525)	$ 525	$ (525)
Balance Ending (in shares) at Sep. 30, 2018							13,304,976
Balance ending at Sep. 30, 2018	213,515				(7,433)		$ 140,996	91,617	(11,665)	(7,433)
Balance Beginning (in shares) at Jun. 30, 2018							13,299,235
Balance beginning at Jun. 30, 2018	212,366						$ 140,870	89,544	(11,665)	(6,383)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,201		4,201
Other comprehensive income, net of taxes	(1,050)				(1,050)
Dividend Reinvestment and Stock Purchase Plan (in shares)		5,741
Dividend Reinvestment and Stock Purchase Plan	108	$ 108
Compensation expense relating to restricted stock (in shares)		0
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition	18	$ 18
Common stock dividends, $0.48 per share	(2,128)		$ (2,128)
Balance Ending (in shares) at Sep. 30, 2018							13,304,976
Balance ending at Sep. 30, 2018	$ 213,515				$ (7,433)		$ 140,996	$ 91,617	$ (11,665)	$ (7,433)