CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect of Change in Accounting Principles	Balances, January 1, 2020	Common Stock	Common Stock Balances, January 1, 2020	Additional Paid-in Capital	Additional Paid-in Capital Balances, January 1, 2020	Retained Earnings	Retained Earnings Cumulative Effect of Change in Accounting Principles	Retained Earnings Balances, January 1, 2020	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Balances, January 1, 2020
Beginning Balances (in shares) at Dec. 31, 2018				24,967,458
Beginning Balance at Dec. 31, 2018	$ 458,640			$ 24,967		$ 229,347		$ 211,424			$ (7,098)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME	15,067							15,067
Other Comprehensive Income	9,414										9,414
Cash Dividends	(4,245)							(4,245)
Issuance of Common Stock for:
Restricted Share Grants (in shares)				24,780
Restricted Share Grants	311			$ 25		286
Ending Balances (in shares) at Mar. 31, 2019				24,992,238
Ending Balance at Mar. 31, 2019	479,187			$ 24,992		229,633		222,246			2,316
Beginning Balances (in shares) at Dec. 31, 2018				24,967,458
Beginning Balance at Dec. 31, 2018	458,640			$ 24,967		229,347		211,424			(7,098)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME	43,402
Other Comprehensive Income	22,954
Ending Balances (in shares) at Sep. 30, 2019				26,662,078
Ending Balance at Sep. 30, 2019	562,927			$ 26,662		278,608		241,801			15,856
Beginning Balances (in shares) at Mar. 31, 2019				24,992,238
Beginning Balance at Mar. 31, 2019	479,187			$ 24,992		229,633		222,246			2,316
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME	15,271							15,271
Other Comprehensive Income	8,891										8,891
Cash Dividends	(4,248)							(4,248)
Issuance of Common Stock for:
Restricted Share Grants	310					310
Ending Balances (in shares) at Jun. 30, 2019				24,992,238
Ending Balance at Jun. 30, 2019	499,411			$ 24,992		229,943		233,269			11,207
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME	13,064							13,064
Other Comprehensive Income	4,649										4,649
Cash Dividends	(4,532)							(4,532)
Issuance of Common Stock for:
Acquisition of Citizens First Corporation (in shares)				1,663,954
Acquisition of Citizens First Corporation	50,024			$ 1,664		48,360
Restricted Share Grants (in shares)				5,886
Restricted Share Grants	311			$ 6		305
Ending Balances (in shares) at Sep. 30, 2019				26,662,078
Ending Balance at Sep. 30, 2019	562,927			$ 26,662		278,608		241,801			15,856
Beginning Balances (in shares) at Dec. 31, 2019				26,671,368	26,671,368
Beginning Balance at Dec. 31, 2019	573,820	$ (6,717)	$ 567,103	$ 26,671	$ 26,671	278,954	$ 278,954	253,090	$ (6,717)	$ 246,373	15,105	$ 15,105
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME	12,472							12,472
Other Comprehensive Income	13,255										13,255
Cash Dividends	(5,065)							(5,065)
Issuance of Common Stock for:
Restricted Share Grants (in shares)				41,752
Restricted Share Grants	270			$ 42		228
Stock Repurchase (in shares)				(173,089)
Stock Repurchase	(4,495)			$ (173)		(4,322)
Ending Balances (in shares) at Mar. 31, 2020				26,540,031
Ending Balance at Mar. 31, 2020	583,540			$ 26,540		274,860		253,780			28,360
Beginning Balances (in shares) at Dec. 31, 2019				26,671,368	26,671,368
Beginning Balance at Dec. 31, 2019	573,820	$ (6,717)	$ 567,103	$ 26,671	$ 26,671	278,954	$ 278,954	253,090	$ (6,717)	$ 246,373	15,105	$ 15,105
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME	41,320
Other Comprehensive Income	15,638
Ending Balances (in shares) at Sep. 30, 2020				26,492,866
Ending Balance at Sep. 30, 2020	603,981			$ 26,493		274,166		272,579			30,743
Beginning Balances (in shares) at Mar. 31, 2020				26,540,031
Beginning Balance at Mar. 31, 2020	583,540			$ 26,540		274,860		253,780			28,360
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME	14,255							14,255
Other Comprehensive Income	2,789										2,789
Cash Dividends	(5,024)							(5,024)
Issuance of Common Stock for:
Restricted Share Grants (in shares)				1,426
Restricted Share Grants	282			$ 1		281
Stock Repurchase (in shares)				(44,166)
Stock Repurchase	(1,168)			$ (44)		(1,124)
Ending Balances (in shares) at Jun. 30, 2020				26,497,291
Ending Balance at Jun. 30, 2020	594,674			$ 26,497		274,017		263,011			31,149
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME	14,593							14,593
Other Comprehensive Income	(406)										(406)
Cash Dividends	(5,025)							(5,025)
Issuance of Common Stock for:
Restricted Share Grants (in shares)				(378)
Restricted Share Grants	254					254
Stock Repurchase (in shares)				(4,047)
Stock Repurchase	(109)			$ (4)		(105)
Ending Balances (in shares) at Sep. 30, 2020				26,492,866
Ending Balance at Sep. 30, 2020	$ 603,981			$ 26,493		$ 274,166		$ 272,579			$ 30,743