CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income / (Loss)	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
Increase (Decrease) in Shareholders' Equity
Cumulative effect of change in accounting principles (Note 1)		(6,062)		(6,062)
Adjusted balances	$ 489,745	90,679	(9,778)	570,646
Balance at Dec. 31, 2019	$ 489,745	96,741	(9,778)	576,708
Balance (in shares) at Dec. 31, 2019	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