CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock Adjusted Balance	Common Stock	Retained Earnings Adjusted Balance	Retained Earnings Adjustment	Retained Earnings	Accumulated Other Comprehensive Income / (Loss) Adjusted Balance	Accumulated Other Comprehensive Income / (Loss)	Adjusted Balance	Adjustment	Total
Balance at Dec. 31, 2018		$ 300,844			$ 79,003		$ (12,381)			$ 367,466
Balance (in shares) at Dec. 31, 2018		43,288,750
Increase (Decrease) in Shareholders' Equity
Net income					12,146					12,146
Other comprehensive income (loss)							3,394			3,394
Amortization of restricted stock awards, net of forfeitures and taxes		$ 271								271
Cash dividend declared					(5,196)					(5,196)
Stock option expense, net of forfeitures and taxes		166								166
Stock options exercised		$ 269								269
Stock options exercised (in shares)		35,003
Balance at Mar. 31, 2019		$ 301,550			85,953		(8,987)			378,516
Balance (in shares) at Mar. 31, 2019		43,323,753
Balance at Dec. 31, 2018		$ 300,844			79,003		(12,381)			367,466
Balance (in shares) at Dec. 31, 2018		43,288,750
Increase (Decrease) in Shareholders' Equity
Net income										23,499
Other comprehensive income (loss)							6,079			6,079
Balance at Jun. 30, 2019		$ 302,305			92,105		(6,302)			388,108
Balance (in shares) at Jun. 30, 2019		43,498,406
Balance at Mar. 31, 2019		$ 301,550			85,953		(8,987)			378,516
Balance (in shares) at Mar. 31, 2019		43,323,753
Increase (Decrease) in Shareholders' Equity
Net income					11,353					11,353
Other comprehensive income (loss)							2,685			2,685
Issuance of restricted stock awards, net (in shares)		134,653
Amortization of restricted stock awards, net of forfeitures and taxes		$ 303								303
Cash dividend declared					(5,201)					(5,201)
Stock option expense, net of forfeitures and taxes		155								155
Stock options exercised		$ 297								297
Stock options exercised (in shares)		40,000
Balance at Jun. 30, 2019		$ 302,305			92,105		(6,302)			388,108
Balance (in shares) at Jun. 30, 2019		43,498,406
Balance at Dec. 31, 2019	$ 489,745	$ 489,745	$ 90,679	$ (6,062)	96,741	$ (9,778)	(9,778)	$ 570,646	$ (6,062)	576,708
Balance (in shares) at Dec. 31, 2019	59,368,156	59,368,156
Increase (Decrease) in Shareholders' Equity
Net income					1,861					1,861
Other comprehensive income (loss)							5,069			5,069
Amortization of restricted stock awards, net of forfeitures and taxes		$ 348								348
Cash dividend declared					(7,737)					(7,737)
Stock option expense, net of forfeitures and taxes		148								148
Stock options exercised		$ 1,106								1,106
Stock options exercised (in shares)		200,063
Balance at Mar. 31, 2020		$ 491,347			84,803		(4,709)			571,441
Balance (in shares) at Mar. 31, 2020		59,568,219
Balance at Dec. 31, 2019	$ 489,745	$ 489,745	$ 90,679	$ (6,062)	96,741	$ (9,778)	(9,778)	$ 570,646	$ (6,062)	576,708
Balance (in shares) at Dec. 31, 2019	59,368,156	59,368,156
Increase (Decrease) in Shareholders' Equity
Net income										12,479
Other comprehensive income (loss)							4,598			4,598
Balance at Jun. 30, 2020		$ 492,333			87,654		(5,180)			574,807
Balance (in shares) at Jun. 30, 2020		59,856,767
Balance at Mar. 31, 2020		$ 491,347			84,803		(4,709)			571,441
Balance (in shares) at Mar. 31, 2020		59,568,219
Increase (Decrease) in Shareholders' Equity
Net income					10,618					10,618
Other comprehensive income (loss)							(471)			(471)
Issuance of restricted stock awards, net (in shares)		168,117
Amortization of restricted stock awards, net of forfeitures and taxes		$ 463								463
Cash dividend declared					(7,767)					(7,767)
Stock option expense, net of forfeitures and taxes		139								139
Stock options exercised		$ 384								384
Stock options exercised (in shares)		120,431
Balance at Jun. 30, 2020		$ 492,333			$ 87,654		$ (5,180)			$ 574,807
Balance (in shares) at Jun. 30, 2020		59,856,767