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CONDENSED FINANCIAL INFORMATION - PARENT COMPANY ONLY, Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities [Abstract]                      
Net income $ 6,944 $ 7,064 $ 6,647 $ 8,463 $ 7,227 $ 8,007 $ 5,338 $ 4,531 $ 29,118 $ 25,103 $ 19,490
Adjustments to reconcile net income to net cash provided by operating activities [Abstract]                      
Investment securities (gains) losses, net                 (339) 41 (120)
Other, net                 180 1,580 (182)
Net cash provided by operating activities                 38,693 11,822 21,767
Cash flows from investing activities [Abstract]                      
Purchases of equity securities                 (211,218) (143,987) (68,963)
Proceeds from sale of equity securities                 0 168 0
Net cash used in investing activities                 (158,232) (110,734) (32,323)
Cash flows from financing activities [Abstract]                      
Cash dividends paid                 (7,383) (6,539) (6,315)
Purchase of treasury stock                 (1,374) (2,122) (1,291)
Sale of treasury stock to employee stock purchase plan                 0 126 0
Net cash provided by financing activities                 223,665 149,099 12,279
Net increase in cash and cash equivalents                 104,126 50,187 1,723
Cash and Cash Equivalents at Beginning of Year       68,707       18,520 68,707 18,520 16,797
Cash and Cash Equivalents at End of Year 172,833       68,707       172,833 68,707 18,520
Parent Company [Member]                      
Cash flows from operating activities [Abstract]                      
Net income                 29,118 25,103 19,490
Adjustments to reconcile net income to net cash provided by operating activities [Abstract]                      
Equity in undistributed earnings of subsidiaries                 (20,744) (9,685) (10,910)
Investment securities (gains) losses, net                 (284) 23 (101)
Other, net                 543 14 717
Net cash provided by operating activities                 8,633 15,455 9,196
Cash flows from investing activities [Abstract]                      
Purchases of equity securities                 0 (1,339) 0
Proceeds from sale of equity securities                 0 168 0
Acquisition of Midcoast                 0 (7,614) 0
Net cash used in investing activities                 0 (8,785) 0
Cash flows from financing activities [Abstract]                      
Cash dividends paid                 (7,383) (6,539) (6,315)
Issuance of subordinated debt                 9,869 0 0
Purchase of treasury stock                 (1,374) (2,122) (1,291)
Sale of treasury stock to employee stock purchase plan                 0 126 0
Net cash provided by financing activities                 1,112 (8,535) (7,606)
Net increase in cash and cash equivalents                 9,745 (1,865) 1,590
Cash and Cash Equivalents at Beginning of Year       $ 5,301       $ 7,166 5,301 7,166 5,576
Cash and Cash Equivalents at End of Year $ 15,046       $ 5,301       $ 15,046 $ 5,301 $ 7,166