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CONDENSED FINANCIAL INFORMATION - PARENT COMPANY ONLY (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ 16,374,000 |  |  |  | $ 17,727,000 |  |  |  | $ 16,374,000 | $ 17,727,000 |  |
Investments | 295,189,000 |  |  |  | 240,706,000 |  |  |  | 295,189,000 | 240,706,000 |  |
OtherAssets | 19,404,000 |  |  |  | 16,359,000 |  |  |  | 19,404,000 | 16,359,000 |  |
TOTAL ASSETS | 1,891,674,000 |  |  |  | 1,466,339,000 |  |  |  | 1,891,674,000 | 1,466,339,000 |  |
Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
OtherLiabilities | 18,702,000 |  |  |  | 14,242,000 |  |  |  | 18,702,000 | 14,242,000 |  |
Borrowed funds | 88,838,000 |  |  |  | 85,117,000 |  |  |  | 88,838,000 | 85,117,000 |  |
TOTAL LIABILITIES | 1,697,415,000 |  |  |  | 1,311,565,000 |  |  |  | 1,697,415,000 | 1,311,565,000 |  |
Stockholders' equity | 194,259,000 |  |  |  | 154,774,000 |  |  |  | 194,259,000 | 154,774,000 | $ 139,229,000 | $ 129,011,000
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 1,891,674,000 |  |  |  | 1,466,339,000 |  |  |  | 1,891,674,000 | 1,466,339,000 |  |
Dividends from [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
TOTAL INTEREST AND DIVIDEND INCOME | 18,411,000 | $ 18,386,000 | $ 18,160,000 | $ 15,339,000 | 15,587,000 | $ 15,874,000 | $ 15,502,000 | $ 15,017,000 | 70,296,000 | 61,980,000 | 56,758,000 |
Realized securities gains (losses) |  |  |  |  |  |  |  |  | (41,000) | 120,000 | 0 |
Expenses |  |  |  |  |  |  |  |  | 6,481,000 | 5,682,000 | 5,294,000 |
NET INCOME | 7,227,000 | 8,007,000 | 5,338,000 | 4,531,000 | 5,043,000 | 5,196,000 | 4,846,000 | 4,405,000 | 25,103,000 | 19,490,000 | 18,034,000 |
Comprehensive income |  |  |  |  |  |  |  |  | 28,319,000 | 22,782,000 | 17,510,000 |
Cash flows from operating activities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net income | 7,227,000 | $ 8,007,000 | $ 5,338,000 | 4,531,000 | 5,043,000 | $ 5,196,000 | $ 4,846,000 | 4,405,000 | 25,103,000 | 19,490,000 | 18,034,000 |
Adjustments to reconcile net income to net cash provided by operating activities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Investment securities (gains) losses, net |  |  |  |  |  |  |  |  | 41,000 | (120,000) | 0 |
Other, net |  |  |  |  |  |  |  |  | 1,580,000 | (182,000) | 787,000 |
Net cash (used in) provided by operating activities |  |  |  |  |  |  |  |  | 11,822,000 | 21,767,000 | 21,486,000 |
Cash flows from investing activities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Purchases of equity securities |  |  |  |  |  |  |  |  | (143,987,000) | (68,963,000) | (67,899,000) |
Proceeds from sale of equity securities |  |  |  |  |  |  |  |  | 168,000 | 0 | 0 |
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  | (110,734,000) | (32,323,000) | (72,351,000) |
Cash flows from financing activities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid |  |  |  |  |  |  |  |  | (6,539,000) | (6,315,000) | (6,116,000) |
Purchase of treasury stock |  |  |  |  |  |  |  |  | (2,122,000) | (1,291,000) | (1,175,000) |
Reissuance of treasury stock to employee stock purchase plan |  |  |  |  |  |  |  |  | 126,000 | 0 | 0 |
Net cash provided by financing activities |  |  |  |  |  |  |  |  | 149,099,000 | 12,279,000 | 49,145,000 |
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 50,187,000 | 1,723,000 | (1,720,000) |
Cash and Cash Equivalents at Beginning of Year |  |  |  | 18,520,000 |  |  |  | 16,797,000 | 18,520,000 | 16,797,000 | 18,517,000 |
Cash and Cash Equivalents at End of Year | 68,707,000 |  |  |  | 18,520,000 |  |  |  | 68,707,000 | 18,520,000 | 16,797,000 |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cash | 5,301,000 |  |  |  | 7,166,000 |  |  |  | 5,301,000 | 7,166,000 |  |
Investments | 1,866,000 |  |  |  | 617,000 |  |  |  | 1,866,000 | 617,000 |  |
Investment in subsidiary | 194,312,000 |  |  |  | 154,501,000 |  |  |  | 194,312,000 | 154,501,000 |  |
OtherAssets | 846,000 |  |  |  | 744,000 |  |  |  | 846,000 | 744,000 |  |
TOTAL ASSETS | 202,325,000 |  |  |  | 163,028,000 |  |  |  | 202,325,000 | 163,028,000 |  |
Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
OtherLiabilities | 566,000 |  |  |  | 754,000 |  |  |  | 566,000 | 754,000 |  |
Borrowed funds | 7,500,000 |  |  |  | 7,500,000 |  |  |  | 7,500,000 | 7,500,000 |  |
TOTAL LIABILITIES | 8,066,000 |  |  |  | 8,254,000 |  |  |  | 8,066,000 | 8,254,000 |  |
Stockholders' equity | 194,259,000 |  |  |  | 154,774,000 |  |  |  | 194,259,000 | 154,774,000 |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 202,325,000 |  |  |  | 163,028,000 |  |  |  | 202,325,000 | 163,028,000 |  |
Dividends from [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary |  |  |  |  |  |  |  |  | 16,171,000 | 9,565,000 | 8,248,000 |
Equity securities |  |  |  |  |  |  |  |  | 45,000 | 17,000 | 7,000 |
TOTAL INTEREST AND DIVIDEND INCOME |  |  |  |  |  |  |  |  | 16,216,000 | 9,582,000 | 8,255,000 |
Realized securities gains (losses) |  |  |  |  |  |  |  |  | (23,000) | 101,000 | 0 |
Expenses |  |  |  |  |  |  |  |  | 775,000 | 1,103,000 | 642,000 |
Income before equity in undistributed earnings of subsidiary |  |  |  |  |  |  |  |  | 15,418,000 | 8,580,000 | 7,613,000 |
Equity in undistributed earnings of subsidiary |  |  |  |  |  |  |  |  | 9,685,000 | 10,910,000 | 10,421,000 |
NET INCOME |  |  |  |  |  |  |  |  | 25,103,000 | 19,490,000 | 18,034,000 |
Comprehensive income |  |  |  |  |  |  |  |  | 28,319,000 | 22,782,000 | 17,510,000 |
Cash flows from operating activities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 25,103,000 | 19,490,000 | 18,034,000 |
Adjustments to reconcile net income to net cash provided by operating activities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed earnings of subsidiary |  |  |  |  |  |  |  |  | (9,685,000) | (10,910,000) | (10,421,000) |
Investment securities (gains) losses, net |  |  |  |  |  |  |  |  | 23,000 | (101,000) | 0 |
Other, net |  |  |  |  |  |  |  |  | 14,000 | 717,000 | (251,000) |
Net cash (used in) provided by operating activities |  |  |  |  |  |  |  |  | 15,455,000 | 9,196,000 | 7,362,000 |
Cash flows from investing activities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Purchases of equity securities |  |  |  |  |  |  |  |  | (1,339,000) | 0 | (425,000) |
Proceeds from sale of equity securities |  |  |  |  |  |  |  |  | 168,000 | 0 | 0 |
Acquisition of Midcoast |  |  |  |  |  |  |  |  | (7,614,000) |  |  |
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  | (8,785,000) | 0 | (425,000) |
Cash flows from financing activities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid |  |  |  |  |  |  |  |  | (6,539,000) | (6,315,000) | (6,116,000) |
Purchase of treasury stock |  |  |  |  |  |  |  |  | (2,122,000) | (1,291,000) | (1,483,000) |
Reissuance of treasury stock to employee stock purchase plan |  |  |  |  |  |  |  |  | 126,000 | 0 | 0 |
Net cash provided by financing activities |  |  |  |  |  |  |  |  | (8,535,000) | (7,606,000) | (7,599,000) |
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | (1,865,000) | 1,590,000 | (662,000) |
Cash and Cash Equivalents at Beginning of Year |  |  |  | $ 7,166,000 |  |  |  | $ 5,576,000 | 7,166,000 | 5,576,000 | 6,238,000 |
Cash and Cash Equivalents at End of Year | $ 5,301,000 |  |  |  | $ 7,166,000 |  |  |  | $ 5,301,000 | $ 7,166,000 | $ 5,576,000 |

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