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SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE (Tables) | 12 Months Ended
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Dec. 31, 2020
Stockholders' Equity Note [Abstract] |
Schedule of Actual and Required Capital Ratios | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Regulatory Minimum to | ​
​ | ​ | Actual | ​ | be "Well-Capitalized" | ​
(in thousands, except ratios) |  | Amount |  | Ratio | ​ | Amount |  | Ratio | ​
Company (consolidated) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​
Total capital to risk-weighted assets | ​ | $ | 353,239 | ​ | 13.56 | % | ​ | $ | 273,479 | ​ | 10.50 | %
Common equity tier 1 capital to risk-weighted assets | ​ |  | 273,178 | ​ | 10.49 | ​ | ​ |  | 182,320 | ​ | 7.00 | ​
Tier 1 capital to risk-weighted assets | ​ |  | 273,178 | ​ | 11.28 | ​ | ​ |  | 205,850 | ​ | 8.50 | ​
Tier 1 capital to average assets | ​ |  | 273,178 | ​ | 8.12 | ​ | ​ |  | 168,147 | ​ | 5.00 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Bank | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total capital to risk-weighted assets | ​ | $ | 345,397 | ​ | 13.27 | % | ​ | $ | 273,298 | ​ | 10.50 | %
Common equity tier 1 capital to risk-weighted assets | ​ |  | 325,956 | ​ | 12.52 | ​ | ​ |  | 182,244 | ​ | 7.00 | ​
Tier 1 capital to risk-weighted assets | ​ |  | 325,956 | ​ | 12.52 | ​ | ​ |  | 221,296 | ​ | 8.50 | ​
Tier 1 capital to average assets | ​ |  | 325,956 | ​ | 9.02 | ​ | ​ |  | 180,685 | ​ | 5.00 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2019 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Regulatory Minimum to | ​
​ | ​ | Actual | ​ | be "Well-Capitalized" | ​
(in thousands, except ratios) |  | Amount |  | Ratio | ​ | Amount |  | Ratio | ​
Company (consolidated) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​
Total capital to risk-weighted assets | ​ | $ | 341,492 | ​ | 13.61 | % | ​ | $ | 263,377 | ​ | 10.50 | %
Common equity tier 1 capital to risk-weighted assets | ​ |  | 265,205 | ​ | 10.57 | ​ | ​ |  | 175,584 | ​ | 7.00 | ​
Tier 1 capital to risk-weighted assets | ​ |  | 285,825 | ​ | 11.39 | ​ | ​ |  | 213,211 | ​ | 8.50 | ​
Tier 1 capital to average assets | ​ |  | 285,825 | ​ | 8.13 | ​ | ​ |  | 175,890 | ​ | 5.00 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Bank | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total capital to risk-weighted assets | ​ | $ | 310,982 | ​ | 12.42 | % | ​ | $ | 262,999 | ​ | 10.50 | %
Common equity tier 1 capital to risk-weighted assets | ​ |  | 295,315 | ​ | 11.79 | ​ | ​ |  | 175,332 | ​ | 7.00 | ​
Tier 1 capital to risk-weighted assets | ​ |  | 295,315 | ​ | 11.79 | ​ | ​ |  | 212,904 | ​ | 8.50 | ​
Tier 1 capital to average assets | ​ |  | 295,315 | ​ | 8.39 | ​ | ​ |  | 175,996 | ​ | 5.00 | ​
Schedule of Components of Accumulated Other Comprehensive Income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2020 |  | 2019
Accumulated other comprehensive income, before tax: |  | ​ |  |  | ​ |
Net unrealized gain on AFS securities | ​ | $ | 13,069 | ​ | $ | 7,250
Net unrealized gain (loss) on hedging derivatives | ​ |  | 3,144 | ​ |  | (628)
Net unrealized loss on post-retirement plans | ​ |  | (1,850) | ​ |  | (1,512)
​ | ​ | ​ | ​ | ​ | ​ | ​
Income taxes related to items of accumulated other comprehensive income: | ​ |  |  | ​ |  |
Net unrealized gain on AFS securities | ​ |  | (3,046) | ​ |  | (1,703)
Net unrealized (gain) loss on hedging derivatives | ​ |  | (733) | ​ |  | 149
Net unrealized loss on post-retirement plans | ​ |  | 432 | ​ |  | 355
Accumulated other comprehensive income | ​ | $ | 11,016 | ​ | $ | 3,911
Schedule of Components of Other Comprehensive Income (Loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020
(in thousands) |  | Before Tax |  | Tax Effect |  | Net of Tax
Net unrealized gain on AFS securities: |  | ​ |  |  | ​ |  |  | ​ |
Net unrealized gain arising during the period | ​ | $ | 11,264 | ​ | $ | (2,636) | ​ | $ | 8,628
Less: reclassification adjustment for gains (losses) realized in net income | ​ |  | 5,445 | ​ |  | (1,291) | ​ |  | 4,154
Net unrealized gain on AFS securities | ​ |  | 5,819 | ​ |  | (1,345) | ​ |  | 4,474
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net unrealized gain on hedging derivatives: | ​ |  |  | ​ |  |  | ​ |  | ​
Net unrealized loss arising during the period | ​ |  | (1,080) | ​ |  | 37 | ​ |  | (1,043)
Less: reclassification adjustment for (losses) gains realized in net income | ​ |  | (4,852) | ​ |  | 917 | ​ |  | (3,935)
Net unrealized gain on hedging derivatives | ​ |  | 3,772 | ​ |  | (880) | ​ |  | 2,892
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net unrealized loss on post-retirement plans: | ​ |  |  | ​ |  |  | ​ |  | ​
Net unrealized loss arising during the period | ​ |  | (338) | ​ |  | 77 | ​ |  | (261)
Less: reclassification adjustment for gains (losses) realized in net income | ​ |  | — | ​ |  | — | ​ |  | —
Net unrealized loss on post-retirement plans | ​ |  | (338) | ​ |  | 77 | ​ |  | (261)
Other comprehensive income | ​ | $ | 9,253 | ​ | $ | (2,148) | ​ | $ | 7,105
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2019
(in thousands) |  | Before Tax |  | Tax Effect |  | Net of Tax
Net unrealized gain on AFS securities: |  | ​ |  |  | ​ |  |  | ​ |
Net unrealized gain arising during the period | ​ | $ | 18,883 | ​ | $ | (4,489) | ​ | $ | 14,394
Less: reclassification adjustment for gains (losses) realized in net income | ​ |  | 237 | ​ |  | (55) | ​ |  | 182
Net unrealized gain on AFS securities | ​ |  | 18,646 | ​ |  | (4,434) | ​ |  | 14,212
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net unrealized loss on derivative hedges: | ​ |  | ​ | ​ |  |  | ​ |  |
Net unrealized loss arising during the period | ​ |  | (938) | ​ |  | 289 | ​ |  | (649)
Less: reclassification adjustment for gains (losses) realized in net income | ​ |  | (3,156) | ​ |  | 737 | ​ |  | (2,419)
Net unrealized gain on derivative hedges | ​ |  | 2,218 | ​ |  | (448) | ​ |  | 1,770
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net unrealized loss on post-retirement plans: | ​ |  |  | ​ |  |  | ​ |  |
Net unrealized loss arising during the period | ​ |  | (352) | ​ |  | 83 | ​ |  | (269)
Less: reclassification adjustment for gains (losses) realized in net income | ​ |  | — | ​ |  | — | ​ |  | —
Net unrealized loss on post-retirement plans | ​ |  | (352) | ​ |  | 83 | ​ |  | (269)
Other comprehensive income | ​ | $ | 20,512 | ​ | $ | (4,799) | ​ | $ | 15,713
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2018
(in thousands) |  | Before Tax |  | Tax Effect |  | Net of Tax
Net unrealized loss on AFS securities: |  | ​ |  |  | ​ |  |  | ​ |
Net unrealized arising during the period | ​ | $ | (9,487) | ​ | $ | 2,194 | ​ | $ | (7,293)
Less: reclassification adjustment for gains (losses) realized in net income | ​ |  | (924) | ​ |  | 216 | ​ |  | (708)
Net unrealized loss on AFS securities | ​ |  | (8,563) | ​ |  | 1,978 | ​ |  | (6,585)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net unrealized gain on derivative hedges: | ​ |  |  | ​ |  |  | ​ |  |
Net unrealized gain arising during the period | ​ |  | 654 | ​ |  | (168) | ​ |  | 486
Less: reclassification adjustment for gains (losses) realized in net income | ​ |  | — | ​ |  | — | ​ |  | —
Net unrealized gain on derivative hedges | ​ |  | 654 | ​ |  | (168) | ​ |  | 486
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net unrealized loss on post-retirement plans: | ​ |  |  | ​ |  |  | ​ |  |
Net unrealized loss arising during the period | ​ |  | (245) | ​ |  | 54 | ​ |  | (191)
Less: reclassification adjustment for gains (losses) realized in net income | ​ |  | (29) | ​ |  | 7 | ​ |  | (22)
Net unrealized loss on post-retirement plans | ​ |  | (216) | ​ |  | 47 | ​ |  | (169)
Other comprehensive loss | ​ | $ | (8,125) | ​ | $ | 1,857 | ​ | $ | (6,268)
Schedule of Changes in Components of Accumulated Other Comprehensive Income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020
​ |  | Net unrealized |  | Net loss on |  | Net unrealized |  | ​ | ​
​ | ​ | gain | ​ | effective cash | ​ | loss | ​ | ​ | ​
​ | ​ | on AFS | ​ | flow hedging | ​ | on pension | ​ | ​ | ​
(in thousands) | ​ | Securities | ​ | derivatives | ​ | plans | ​ | Total
Balance at beginning of period | ​ | $ | 5,547 | ​ | $ | (479) | ​ | $ | (1,157) | ​ | $ | 3,911
Other comprehensive gain (loss) before reclassifications | ​ |  | 8,628 | ​ |  | (1,043) | ​ |  | (261) | ​ |  | 7,324
Less: amounts reclassified from accumulated other comprehensive income | ​ |  | 4,154 | ​ |  | (3,935) | ​ |  | — | ​ |  | 219
Total other comprehensive income (loss) | ​ |  | 4,474 | ​ |  | 2,892 | ​ |  | (261) | ​ |  | 7,105
Balance at end of period | ​ | $ | 10,021 | ​ | $ | 2,413 | ​ | $ | (1,418) | ​ | $ | 11,016
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019
​ |  | Net unrealized |  | Net loss on |  | Net unrealized |  | ​ | ​
​ | ​ | (loss) gain | ​ | effective cash | ​ | loss | ​ | ​ | ​
​ | ​ | on AFS | ​ | flow hedging | ​ | on pension | ​ | ​ | ​
(in thousands) | ​ | Securities | ​ | derivatives | ​ | plans | ​ | Total
Balance at beginning of period | ​ | $ | (8,665) | ​ | $ | (2,249) | ​ | $ | (888) | ​ | $ | (11,802)
Other comprehensive (loss) gain before reclassifications | ​ |  | 14,394 | ​ |  | (649) | ​ |  | (269) | ​ |  | 13,476
Less: amounts reclassified from accumulated other comprehensive income | ​ |  | 182 | ​ |  | (2,419) | ​ |  | — | ​ |  | (2,237)
Total other comprehensive income (loss) | ​ |  | 14,212 | ​ |  | 1,770 | ​ |  | (269) | ​ |  | 15,713
Less: amounts reclassified from accumulated other comprehensive income for ASU 2018-02 | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | —
Balance at end of period | ​ | $ | 5,547 | ​ | $ | (479) | ​ | $ | (1,157) | ​ | $ | 3,911
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2018
​ |  | Net unrealized |  | Net loss on |  | Net unrealized |  | ​ | ​
​ | ​ | (loss) gain | ​ | effective cash | ​ | loss | ​ | ​ | ​
​ | ​ | on AFS | ​ | flow hedging | ​ | on pension | ​ | ​ | ​
(in thousands) | ​ | Securities | ​ | derivatives | ​ | plans | ​ | Total
Balance at beginning of period | ​ | $ | (1,713) | ​ | $ | (2,250) | ​ | $ | (591) | ​ | $ | (4,554)
Other comprehensive (loss) gain before reclassifications | ​ |  | (7,293) | ​ |  | 486 | ​ |  | (191) | ​ |  | (6,998)
Less: amounts reclassified from accumulated other comprehensive income | ​ |  | (708) | ​ |  | — | ​ |  | (22) | ​ |  | (730)
Total other comprehensive (loss) income | ​ |  | (6,585) | ​ |  | 486 | ​ |  | (169) | ​ |  | (6,268)
Less: amounts reclassified from accumulated other comprehensive income for ASU 2018-02 | ​ |  | (367) | ​ |  | (485) | ​ |  | (128) | ​ |  | (980)
Balance at end of period | ​ | $ | (8,665) | ​ | $ | (2,249) | ​ | $ | (888) | ​ | $ | (11,802)
​
Reclassification out of Accumulated Other Comprehensive Income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Affected Line Item where
(in thousands) |  | 2020 |  | 2019 |  | 2018 |  | Net Income is Presented
Net realized gains on AFS securities: | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
Before tax | ​ | $ | 5,445 | ​ | $ | 237 | ​ | $ | (924) |  | Non-interest income
Tax effect | ​ |  | (1,291) | ​ |  | (55) | ​ |  | 216 |  | Tax expense
Total reclassifications for the period | ​ | $ | 4,154 | ​ | $ | 182 | ​ | $ | (708) |  | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Affected Line Item where
(in thousands) |  | 2020 |  | 2019 |  | 2018 |  | Net Income is Presented
Realized loss on effective derivative hedges: | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
Before tax | ​ | $ | 4,852 | ​ | $ | (3,156) | ​ | $ | — |  | Non-interest expense
Tax effect | ​ |  | (917) | ​ |  | 737 | ​ |  | — |  | Tax expense
Total reclassifications for the period | ​ | $ | 3,935 | ​ | $ | (2,419) | ​ | $ | — |  | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Affected Line Item where
(in thousands) |  | 2020 |  | 2019 |  | 2018 |  | Net Income is Presented
Realized loss on effective post retirement: | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
Before tax | ​ | $ | — | ​ | $ | — | ​ | $ | (29) |  | Non-interest expense
Tax effect | ​ |  | — | ​ |  | — | ​ |  | 7 |  | Tax expense
Total reclassifications for the period | ​ | $ | — | ​ | $ | — | ​ | $ | (22) |  | ​
​
Schedule of Earnings Per Share | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands, except per share and share data) |  | 2020 |  | 2019 |  | 2018
Net income | ​ | $ | 33,244 | ​ | $ | 22,620 | ​ | $ | 32,937
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Average number of basic common shares outstanding | ​ |  | 15,245,728 | ​ |  | 15,540,884 | ​ |  | 15,487,686
Plus: dilutive effect of stock options and awards outstanding | ​ |  | 25,819 | ​ |  | 46,109 | ​ |  | 76,778
Average number of diluted common shares outstanding | ​ |  | 15,271,547 | ​ |  | 15,586,993 | ​ |  | 15,564,464
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Anti-dilutive options excluded from earnings calculation | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 7,991
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Earnings per share: | ​ |  |  | ​ |  |  | ​ |  |
Basic | ​ | $ | 2.18 | ​ | $ | 1.46 | ​ | $ | 2.13
Diluted | ​ | $ | 2.18 | ​ | $ | 1.45 | ​ | $ | 2.12

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