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MERGERS AND ACQUISITIONS AND BRANCH CONSOLIDATIONS - Narrative (Details) $ / shares in Units, ft² in Thousands |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 01, 2019 USD ($) shares | Oct. 01, 2018 USD ($) shares | Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) | Oct. 31, 2019 ft² bank | Apr. 30, 2019 $ / shares | Sep. 28, 2018 $ / shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Shares of common stock issued for acquisition (in shares) | shares |  |  |  | 1,765,704 | 1,052,635 |  |  |  |
Closing stock price per share (in shares) | $ / shares |  |  |  |  |  |  |  | $ 20.74 | $ 23.80
Goodwill |  |  | $ 19,925,000 | $ 19,925,000 | $ 12,592,000 | $ 719,000 |  |  |
Unaudited pro forma net income |  |  |  | 20,900,000 | 12,200,000 |  |  |  |
Pro forma revenue |  |  |  | 102,500,000 | 95,300,000 |  |  |  |
Merger related expenses |  |  |  | 8,964,000 | 3,197,000 | $ 0 |  |  |
Consolidation of operations expenses |  |  | 988,000 |  |  |  |  |  |
Fixed asset writedowns |  |  | 762,000 |  |  |  |  |  |
Lease termination costs |  |  | 126,000 |  |  |  |  |  |
Severance and other |  |  | 100,000 |  |  |  |  |  |
Assets Held-for-sale |  |  | $ 4,900,000 | 4,900,000 |  |  |  |  |
Pennsylvania Branch Locations |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number Of Bank Branch Locations | bank |  |  |  |  |  |  | 5 |  |
Area of Real Estate Property | ft² |  |  |  |  |  |  | 50 |  |
Mercersburg Financial Corporation |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage of interests acquired |  | 100.00% |  |  |  |  |  |  |
Cash paid |  | $ 4,900,000 |  |  |  |  |  |  |
Consideration transferred |  | 29,900,000 |  |  |  |  |  |  |
Total assets acquired |  | 181,400,000 |  |  |  |  |  |  |
Loans acquired |  | 141,100,000 |  |  |  |  |  |  |
Securities available for sale |  | 7,400,000 |  |  |  |  |  |  |
Total liabilities assumed |  | 163,400,000 |  |  |  |  |  |  |
Deposits |  | 160,400,000 |  |  |  |  |  |  |
Goodwill |  | $ 11,900,000 |  |  |  |  |  |  |
Merger related expenses |  |  |  | 280,000 | 2,900,000 |  |  |  |
Mercersburg Financial Corporation | Investment Banking, Legal And Consulting Fees |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Merger related expenses |  |  |  | 81,000 | 1,200,000 |  |  |  |
Mercersburg Financial Corporation | Information Systems |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Merger related expenses |  |  |  | 199,000 | 1,100,000 |  |  |  |
Mercersburg Financial Corporation | Other Expenses |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Merger related expenses |  |  |  | 0 | 617,000 |  |  |  |
Mercersburg Financial Corporation | Common Stock |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Shares of common stock issued for acquisition (in shares) | shares |  | 1,052,635 |  |  |  |  |  |  |
Hamilton Bancorp, Inc. |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage of interests acquired | 100.00% |  |  |  |  |  |  |  |
Cash paid | $ 14,197,000 |  |  |  |  |  |  |  |
Total assets acquired | 500,177,000 |  |  |  |  |  |  |  |
Loans acquired | 347,361,000 |  |  |  |  |  |  |  |
Securities available for sale | 60,882,000 |  |  |  |  |  |  |  |
Total liabilities assumed | 449,358,000 |  |  |  |  |  |  |  |
Deposits | 388,246,000 |  |  |  |  |  |  |  |
Goodwill | 7,333,000 |  |  |  |  |  |  |  |
Consideration paid | 50,819,000 |  |  |  |  |  |  |  |
Assets acquired excluding goodwill | 492,800,000 |  |  |  |  |  |  |  |
Core deposit intangibles | 4,550,000 |  |  |  |  |  |  |  |
Merger related expenses |  |  |  | 7,700,000 | 267,000 |  |  |  |
Hamilton Bancorp, Inc. | Investment Banking, Legal And Consulting Fees |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Merger related expenses |  |  |  | 1,900,000 | 254,000 |  |  |  |
Hamilton Bancorp, Inc. | Information Systems |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Merger related expenses |  |  |  | 3,700,000 | 0 |  |  |  |
Hamilton Bancorp, Inc. | Other Expenses |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Merger related expenses |  |  |  | $ 2,200,000 | $ 13,000 |  |  |  |
Hamilton Bancorp, Inc. | Core Deposit Intangibles |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Core deposit intangibles | $ 4,600,000 |  |  |  |  |  |  |  |
Amortization Period | 10 years |  |  |  |  |  |  |  |
Hamilton Bancorp, Inc. | Common Stock |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Shares of common stock issued for acquisition (in shares) | shares | 1,765,704 |  |  |  |  |  |  |  |

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