CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Capital	Retained earnings	Accumulated Other Comprehensive Income/(Loss)	Treasury Stock
Balance at Dec. 31, 2018	$ 442,701	$ 1,824	$ 76,774	$ 456,716	$ (23,454)	$ (69,159)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	48,872	0	0	48,872	0	0
Other comprehensive income (loss)	15,953	0	0	0	15,953	0
Treasury Stock, Value, Acquired, Cost Method	(315)					(315)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	801	3	798	0	0	0
Employee Stock Ownership Plan (ESOP), Cash Contributions to ESOP	1,251	0	422	0	0	829
Cash Dividends	(13,533)	0	0	(13,533)	0	0
Balance at Dec. 31, 2019	557,608	2,005	139,694	492,055	(7,501)	(68,645)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	53,844	0	0	53,844	0	0
Other comprehensive income (loss)	17,265	0	0	0	17,265	0
Treasury Stock, Value, Acquired, Cost Method	(9,220)	0	0	0	0	(9,220)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	820	2	818	0	0	0
Employee Stock Ownership Plan (ESOP), Cash Contributions to ESOP	1,471	0	308	0	0	1,163
Cash Dividends	(14,313)	0	0	(14,313)	0	0
Balance at Dec. 31, 2020	596,992	2,007	140,820	521,103	9,764	(76,702)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	52,987	0	0	52,987	0	0
Other comprehensive income (loss)	(12,190)	0	0	0	(12,190)	0
Treasury Stock, Value, Acquired, Cost Method	(42,471)	0	0	0	0	(42,471)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	807	2	805	0	0	0
Employee Stock Ownership Plan (ESOP), Cash Contributions to ESOP	1,402	0	354	0	0	1,048
Cash Dividends	(14,951)	0	0	(14,951)	0	0
Balance at Dec. 31, 2021	$ 582,576	$ 2,009	$ 141,979	$ 559,139	$ (2,426)	$ (118,125)