Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income, Net of Tax [Member]	Total	Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Capital Surplus [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Accumulated Other Comprehensive Income, Net of Tax [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance at Dec. 31, 2019	$ 88,966	$ 224,907	$ 296,760	$ 4,253	$ 614,886	$ 88,966	$ 224,907	$ 294,394	$ 4,253	$ 612,520
Balance (ASU 2016-13 [Member]) at Dec. 31, 2019								$ (2,366)		$ (2,366)
Balance (in shares) at Dec. 31, 2019	17,793,165					17,793,165
Increase (Decrease) in Stockholders' Equity [Roll forward]
Net income			26,231		26,231
Other comprehensive income (loss), net of tax				6,799	6,799
Cash dividends declared			(13,491)		(13,491)
Issuance of common stock	$ 148	309			457
Issuance of common stock (in shares)	29,538
Repurchase of common stock	$ (164)	(935)			(1,099)
Repurchase of common stock (in shares)	(32,664)
Issuance of restricted stock	$ 108	(108)			0
Issuance of restricted stock (in shares)	21,544
Vesting of restricted stock	$ (85)	85			0
Vesting of restricted stock (in shares)	(16,985)
Stock-based compensation		430			430
Balance at Jun. 30, 2020	$ 88,973	224,688	307,134	11,052	631,847
Balance (in shares) at Jun. 30, 2020	17,794,598
Balance at Mar. 31, 2020	$ 88,936	224,277	294,223	5,486	612,922
Balance (in shares) at Mar. 31, 2020	17,787,274
Increase (Decrease) in Stockholders' Equity [Roll forward]
Net income			19,652		19,652
Other comprehensive income (loss), net of tax				5,566	5,566
Cash dividends declared			(6,741)		(6,741)
Issuance of common stock	$ 38	187			225
Issuance of common stock (in shares)	7,585
Issuance of restricted stock	$ 0	0			0
Issuance of restricted stock (in shares)	0
Vesting of restricted stock	$ (1)	1			0
Vesting of restricted stock (in shares)	(261)
Stock-based compensation		223			223
Balance at Jun. 30, 2020	$ 88,973	224,688	307,134	11,052	631,847
Balance (in shares) at Jun. 30, 2020	17,794,598
Balance at Dec. 31, 2020	$ 89,052	225,507	326,738	13,568	$ 654,865
Balance (in shares) at Dec. 31, 2020	17,810,401				17,810,401
Increase (Decrease) in Stockholders' Equity [Roll forward]
Net income			47,549		$ 47,549
Other comprehensive income (loss), net of tax				(5,506)	(5,506)
Cash dividends declared			(13,692)		(13,692)
Issuance of common stock	$ 148	332			480
Issuance of common stock (in shares)	29,566
Repurchase of common stock	$ 0	0			0
Repurchase of common stock (in shares)	0
Issuance of restricted stock	$ 46	(46)			0
Issuance of restricted stock (in shares)	9,193
Vesting of restricted stock	$ (88)	88			0
Vesting of restricted stock (in shares)	(17,681)
Stock-based compensation		387			387
Balance at Jun. 30, 2021	$ 89,158	226,268	360,595	8,062	$ 684,083
Balance (in shares) at Jun. 30, 2021	17,831,479				17,831,479
Balance at Mar. 31, 2021	$ 89,131	225,861	343,511	3,566	$ 662,069
Balance (in shares) at Mar. 31, 2021	17,826,076
Increase (Decrease) in Stockholders' Equity [Roll forward]
Net income			23,931		23,931
Other comprehensive income (loss), net of tax				4,496	4,496
Cash dividends declared			(6,847)		(6,847)
Issuance of common stock	$ 27	215			242
Issuance of common stock (in shares)	5,403
Issuance of restricted stock	$ 0	0			0
Issuance of restricted stock (in shares)	0
Vesting of restricted stock	$ 0	0			0
Vesting of restricted stock (in shares)	0
Stock-based compensation		192			192
Balance at Jun. 30, 2021	$ 89,158	$ 226,268	$ 360,595	$ 8,062	$ 684,083
Balance (in shares) at Jun. 30, 2021	17,831,479				17,831,479