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CONDENSED FINANCIAL INFORMATION - PARENT COMPANY ONLY, Cash Flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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

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- Definition The cash inflow from a borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in liquidation of the entity's assets or underlying collateral. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. + References No definition available. + Details
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- Definition The cash inflow from the issuance of an equity stock that has been previously reacquired by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
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