Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common stock and additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)
Balance (in shares) at Dec. 31, 2018		10,862,651
Balance at beginning of year at Dec. 31, 2018	$ 191,542	$ 62,855	$ 132,460	$ (3,773)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	25,525		25,525
Net unrealized gain (loss) on securities available for sale, net of tax	8,708			8,708
Net gain (loss) on cash flow hedging derivative instruments	(1,341)			(1,341)
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	15			15
Unrecognized gain (loss) for post-retirement benefits, net of tax	(13)			(13)
Comprehensive income	32,894		25,525	7,369
Cash dividends declared	(12,963)		(12,963)
Equity compensation expense	565	$ 565
Payment for repurchase of common stock (in shares)		(7,178)
Payment for repurchase of common stock	(183)		(183)
Issuance of restricted stock (in shares)		19,087
Issuance of restricted stock	0
Proceeds from sale of common stock (in shares)		24,650
Proceeds from sale of common stock	653	$ 653
Balance (in shares) at Dec. 31, 2019		10,899,210
Balance at end of year at Dec. 31, 2019	212,508	$ 64,073	144,839	3,596
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,495
Net unrealized gain (loss) on securities available for sale, net of tax	4,233
Net gain (loss) on cash flow hedging derivative instruments	(4,870)
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	8
Comprehensive income	5,866
Balance at end of year at Mar. 31, 2020	215,257
Balance (in shares) at Dec. 31, 2019		10,899,210
Balance at beginning of year at Dec. 31, 2019	212,508	$ 64,073	144,839	3,596
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	27,129		27,129
Net unrealized gain (loss) on securities available for sale, net of tax	1,352			1,352
Net gain (loss) on cash flow hedging derivative instruments	(5,029)			(5,029)
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	49			49
Unrecognized gain (loss) for post-retirement benefits, net of tax	4			4
Comprehensive income	23,505		27,129	(3,624)
Cash dividends declared	(13,453)		(13,453)
Equity compensation expense	652	$ 652
Payment for repurchase of common stock (in shares)		(5,447)
Payment for repurchase of common stock	(156)		(156)
Issuance of restricted stock (in shares)		27,345
Issuance of restricted stock	0
Proceeds from sale of common stock (in shares)		29,181
Proceeds from sale of common stock	$ 670	$ 670
Balance (in shares) at Dec. 31, 2020	10,950,289	10,950,289
Balance at end of year at Dec. 31, 2020	$ 223,726	$ 65,395	158,359	(28)
Balance at beginning of year at Mar. 31, 2020	215,257
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,569
Net unrealized gain (loss) on securities available for sale, net of tax	(790)
Net gain (loss) on cash flow hedging derivative instruments	(1,414)
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	28
Comprehensive income	4,393
Balance at end of year at Jun. 30, 2020	216,584
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	7,095
Net unrealized gain (loss) on securities available for sale, net of tax	(1,580)
Net gain (loss) on cash flow hedging derivative instruments	387
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	7
Comprehensive income	5,909
Balance at end of year at Sep. 30, 2020	219,440
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,970
Net unrealized gain (loss) on securities available for sale, net of tax	(511)
Net gain (loss) on cash flow hedging derivative instruments	868
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	6
Comprehensive income	$ 7,337
Balance (in shares) at Dec. 31, 2020	10,950,289	10,950,289
Balance at end of year at Dec. 31, 2020	$ 223,726	$ 65,395	158,359	(28)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,922
Net unrealized gain (loss) on securities available for sale, net of tax	(4,790)
Net gain (loss) on cash flow hedging derivative instruments	3,469
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	9
Comprehensive income	7,610
Balance at end of year at Mar. 31, 2021	$ 228,184
Balance (in shares) at Dec. 31, 2020	10,950,289	10,950,289
Balance at beginning of year at Dec. 31, 2020	$ 223,726	$ 65,395	158,359	(28)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	36,269		36,269
Net unrealized gain (loss) on securities available for sale, net of tax	(6,727)			(6,727)
Net gain (loss) on cash flow hedging derivative instruments	4,932			4,932
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	46			46
Unrecognized gain (loss) for post-retirement benefits, net of tax	77			77
Comprehensive income	34,597		36,269	(1,672)
Cash dividends declared	(13,958)		(13,958)
Equity compensation expense	856	$ 856
Payment for repurchase of common stock (in shares)		(9,752)
Payment for repurchase of common stock	(253)		(253)
Issuance of restricted stock, net of forfeitures (in shares)		34,189
Proceeds from sale of common stock (in shares)		24,039
Proceeds from sale of common stock	$ 689	$ 689
Balance (in shares) at Dec. 31, 2021	10,998,765	10,998,765
Balance at end of year at Dec. 31, 2021	$ 245,657	$ 66,940	180,417	(1,700)
Balance at beginning of year at Mar. 31, 2021	228,184
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,787
Net unrealized gain (loss) on securities available for sale, net of tax	971
Net gain (loss) on cash flow hedging derivative instruments	(620)
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	11
Comprehensive income	9,149
Balance at end of year at Jun. 30, 2021	234,155
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9,014
Net unrealized gain (loss) on securities available for sale, net of tax	(1,817)
Net gain (loss) on cash flow hedging derivative instruments	546
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	14
Comprehensive income	7,757
Balance at end of year at Sep. 30, 2021	238,737
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9,546
Net unrealized gain (loss) on securities available for sale, net of tax	(1,091)
Net gain (loss) on cash flow hedging derivative instruments	1,537
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	12
Comprehensive income	$ 10,081
Balance (in shares) at Dec. 31, 2021	10,998,765	10,998,765
Balance at end of year at Dec. 31, 2021	$ 245,657	$ 66,940	$ 180,417	$ (1,700)