CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income/(Loss) [Member]	Treasury Stock [Member]
Balance at Dec. 31, 2018	$ 442,701	$ 1,824	$ 76,774	$ 456,716	$ (23,454)	$ (69,159)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Unrealized gain (loss) on securities, net of tax	34,508	0	0	34,508	0	0
Other comprehensive income (loss)	23,599	0	0	0	23,599	0
Omnibus Equity Incentive Plan	601	2	599	0	0	0
Payments for Repurchase of Common Stock	(315)		0	0	0
Dividends, Common Stock, Cash	(6,390)	0	0	(6,390)	0	0
Balance at Sep. 30, 2019	556,582	2,004	139,073	484,834	145	(69,474)
Balance at Jun. 30, 2019	477,820	1,826	77,173	472,577	(4,282)	(69,474)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Unrealized gain (loss) on securities, net of tax	12,257	0	0	12,257	0	0
Other comprehensive income (loss)	4,427	0	0	0	4,427	0
Omnibus Equity Incentive Plan	200	0	200	0	0	0
Balance at Sep. 30, 2019	556,582	2,004	139,073	484,834	145	(69,474)
Balance at Dec. 31, 2019	557,608	2,005	139,694	492,055	(7,501)	(68,645)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Unrealized gain (loss) on securities, net of tax	38,105	0	0	38,105	0	0
Other comprehensive income (loss)	19,622	0	0	0	19,622	0
Omnibus Equity Incentive Plan	615	1	614	0	0	0
Payments for Repurchase of Common Stock	(1,724)		0	0	0
Dividends, Common Stock, Cash	(7,131)	0	0	(7,131)	0	0
Balance at Sep. 30, 2020	607,095	2,006	140,308	523,029	12,121	(70,369)
Balance at Jun. 30, 2020	590,284	2,006	140,103	509,029	9,515	(70,369)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Unrealized gain (loss) on securities, net of tax	14,000	0	0	14,000	0	0
Other comprehensive income (loss)	2,606	0	0	0	2,606	0
Omnibus Equity Incentive Plan	205	0	205	0	0	0
Balance at Sep. 30, 2020	$ 607,095	$ 2,006	$ 140,308	$ 523,029	$ 12,121	$ (70,369)