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FAIR VALUE MEASUREMENT AND DISCLOSURE (Tables) | 9 Months Ended
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Sep. 30, 2018
Fair Value Disclosures [Abstract] |
Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis | The following table summarizes financial assets and financial liabilities measured at fair value on a recurring basis as of September 30, 2018 and December 31, 2017, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value:
| Fair Value |  | Readily Available Market Prices (Level 1) |  | Observable Market Data (Level 2) |  | Company Determined Fair Value (Level 3)
September 30, 2018 |  |  |  |  |  |  |  |  |  |
Financial assets: |  |  |  |  |  |  |  |  |  |
Loans held for sale | $ | 10,158 |  |  | $ | — |  |  | $ | 10,158 |  |  | $ | — |
AFS investments: |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | 4,818 |  |  | — |  |  | 4,818 |  |  | — |
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises | 460,298 |  |  | — |  |  | 460,298 |  |  | — |
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises | 306,611 |  |  | — |  |  | 306,611 |  |  | — |
Subordinated corporate bonds | 8,616 |  |  | — |  |  | 8,616 |  |  | — |
Equity securities - bank stock | 783 |  |  | — |  |  | 783 |  |  | — |
Customer loan swaps | 15,562 |  |  | — |  |  | 15,562 |  |  | — |
Fixed-rate mortgage interest rate lock commitments | 330 |  |  | — |  |  | 330 |  |  | — |
Forward delivery commitments | 253 |  |  | — |  |  | 253 |  |  | — |
FHLBB advance interest rate swaps | 65 |  |  | — |  |  | 65 |  |  | — |
Financial liabilities: |  |  |  |  |  |  |  |  |  |
Junior subordinated debt interest rate swaps | 4,361 |  |  | — |  |  | 4,361 |  |  | — |
Customer loan swaps | 15,562 |  |  | — |  |  | 15,562 |  |  | — |
Fixed-rate mortgage interest rate lock commitments | 7 |  |  | — |  |  | 7 |  |  | — |
Forward delivery commitments | 12 |  |  | — |  |  | 12 |  |  | — |
December 31, 2017 |  |  |  |  |  |  |  |  |  |
Financial assets: |  |  |  |  |  |  |  |  |  |
Loans held for sale | $ | 8,103 |  |  | $ | — |  |  | $ | 8,103 |  |  | $ | — |
AFS investments: |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | 7,335 |  |  | — |  |  | 7,335 |  |  | — |
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises | 503,302 |  |  | — |  |  | 503,302 |  |  | — |
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises | 272,799 |  |  | — |  |  | 272,799 |  |  | — |
Subordinated corporate bonds | 5,657 |  |  | — |  |  | 5,657 |  |  | — |
Equity investments | 806 |  |  | — |  |  | 806 |  |  | — |
Customer loan swaps | 5,036 |  |  | — |  |  | 5,036 |  |  | — |
Fixed-rate mortgage interest rate lock commitments | 307 |  |  | — |  |  | 307 |  |  | — |
Forward delivery commitments | 158 |  |  | — |  |  | 158 |  |  | — |
FHLBB advance interest rate swaps | 21 |  |  | — |  |  | 21 |  |  | — |
Financial liabilities: |  |  |  |  |  |  |  |  |
Junior subordinated debt interest rate swaps | 7,571 |  |  | — |  |  | 7,571 |  |  | — |
Customer loan swaps | 5,036 |  |  | — |  |  | 5,036 |  |  | — |
Fixed-rate mortgage interest rate lock commitments | 22 |  |  | — |  |  | 22 |  |  | — |
Forward delivery commitments | 16 |  |  | — |  |  | 16 |  |  | — |
Summary of Assets Measured at Fair Value on Non Recurring Basis | The table below highlights financial and non-financial assets measured and recorded at fair value on a non-recurring basis as of September 30, 2018 and December 31, 2017:
| Fair Value |  | Readily Available Market Prices (Level 1) |  | Observable Market Data (Level 2) |  | Company Determined Fair Value (Level 3)
September 30, 2018 |  |  |  |  |  |  |  |  |  |
Financial assets: |  |  |  |  |  |  |  |  |  |
Collateral-dependent impaired loans | $ | 516 |  |  | $ | — |  |  | $ | — |  |  | $ | 516 |
Non-financial assets: |  |  |  |  |  |  |
OREO | 130 |  |  | — |  |  | — |  |  | 130 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |
Financial assets: |  |  |  |  |  |  |  |  |  |
Collateral-dependent impaired loans | $ | 3,696 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,696 |
Non-financial assets: |  |  |  |  |  |  |  |  |  |
OREO | 130 |  |  | — |  |  | — |  |  | 130 |
Valuation Methodology and Unobservable Inputs for Level Three Assets Measured at Fair Value on Non Recurring Basis | The following table presents the valuation methodology and unobservable inputs for Level 3 assets measured at fair value on a non-recurring basis at September 30, 2018 and December 31, 2017:
| Fair Value |  | Valuation Methodology |  | Unobservable input |  | Discount Range (Weighted-Average)
September 30, 2018 |  |  |  |  |  |  |  |
Collateral-dependent impaired loans: |  |  |  |  |  |  |  |  |
Partially charged-off | $ | 44 |  |  | Market approach appraisal of collateral |  | Management adjustment of appraisal |  | 0% | (0%)
|  |  |  |  | Estimated selling costs |  | 10% | (10%)
Specifically reserved | 472 |  |  | Market approach appraisal of collateral |  | Management adjustment of appraisal |  | 0% | (0%)
|  |  |  |  | Estimated selling costs |  | 10% | (10%)
OREO | 130 |  |  | Market approach appraisal of collateral |  | Management adjustment of appraisal |  | 20% | (20%)
|  |  |  |  | Estimated selling cost |  | 10% | (10%)
December 31, 2017 |  |  |  |  |  |  |  |  |
Collateral-dependent impaired loans: |  |  |  |  |  |  |  |  |
Partially charged-off | $ | 86 |  |  | Market approach appraisal of collateral |  | Management adjustment of appraisal |  | 0 - 50% | (18%)
|  |  |  |  | Estimated selling costs |  | 0 - 10% | (6%)
Specifically reserved | 3,610 |  |  | Market approach appraisal of collateral |  | Management adjustment of appraisal |  | 0% | (0%)
|  |  |  |  | Estimated selling costs |  | 10% | (10%)
OREO | 130 |  |  | Market approach appraisal of collateral |  | Management adjustment of appraisal |  | 20% | (20%)
|  |  |  |  | Estimated selling costs |  | 10% | (10%)
Carrying Amounts and Estimated Fair Value for Financial Instrument Assets and Liabilities | The estimated fair values and related carrying amounts for assets and liabilities for which fair value is only disclosed are shown below as of the periods indicated:
|  | Carrying Amount |  | Fair Value |  | Readily Available Market Prices (Level 1) |  | Observable Market Prices (Level 2) |  | Company Determined Market Prices (Level 3)
September 30, 2018 |  |  |  |  |  |  |  |  |  |
Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
HTM securities |  | $ | 92,933 |  |  | $ | 90,550 |  |  | $ | — |  |  | $ | 90,550 |  |  | $ | — |
Residential real estate loans(1) |  | 935,728 |  |  | 904,765 |  |  | — |  |  | — |  |  | 904,765 |
Commercial real estate loans(1) |  | 1,205,397 |  |  | 1,156,934 |  |  | — |  |  | — |  |  | 1,156,934 |
Commercial loans(1)(2) |  | 401,330 |  |  | 394,903 |  |  | — |  |  | — |  |  | 394,903 |
Home equity loans(1) |  | 322,877 |  |  | 315,453 |  |  | — |  |  | — |  |  | 315,453 |
Consumer loans(1) |  | 19,985 |  |  | 18,894 |  |  | — |  |  | — |  |  | 18,894 |
Servicing assets |  | 877 |  |  | 1,856 |  |  | — |  |  | — |  |  | 1,856 |
Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits |  | $ | 638,418 |  |  | $ | 630,600 |  |  | $ | — |  |  | $ | 630,600 |  |  | $ | — |
Short-term borrowings |  | 409,732 |  |  | 409,446 |  |  | — |  |  | 409,446 |  |  | — |
Long-term borrowings |  | 10,738 |  |  | 10,620 |  |  | — |  |  | 10,620 |  |  | — |
Subordinated debentures |  | 59,028 |  |  | 50,465 |  |  | — |  |  | 50,465 |  |  | — |
December 31, 2017 |  |  |  |  |  |  |  |  |  |
Financial assets: |  |  |  |  |  |  |  |  |  |
HTM securities |  | $ | 94,073 |  |  | $ | 94,913 |  |  | $ | — |  |  | $ | 94,913 |  |  | $ | — |
Residential real estate loans(1) |  | 853,283 |  |  | 853,056 |  |  | — |  |  | — |  |  | 853,056 |
Commercial real estate loans(1) |  | 1,152,160 |  |  | 1,115,618 |  |  | — |  |  | — |  |  | 1,115,618 |
Commercial loans(1)(2) |  | 413,898 |  |  | 401,902 |  |  | — |  |  | — |  |  | 401,902 |
Home equity loans(1) |  | 321,011 |  |  | 318,230 |  |  | — |  |  | — |  |  | 318,230 |
Consumer loans(1) |  | 17,916 |  |  | 17,335 |  |  | — |  |  | — |  |  | 17,335 |
Servicing assets |  | 1,025 |  |  | 1,766 |  |  | — |  |  | — |  |  | 1,766 |
Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits |  | $ | 517,032 |  |  | $ | 512,483 |  |  | $ | — |  |  | $ | 512,483 |  |  | $ | — |
Short-term borrowings |  | 541,796 |  |  | 541,605 |  |  | — |  |  | 541,605 |  |  | — |
Long-term borrowings |  | 10,791 |  |  | 10,777 |  |  | — |  |  | 10,777 |  |  | — |
Subordinated debentures |  | 58,911 |  |  | 44,333 |  |  | — |  |  | 44,333 |  |  | — |
(1) | The presented carrying amount is net of the allocated ALL.
(2) | Includes the HPFC loan portfolio.

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, used to measure similar assets in prior periods (non-recurring basis) by class of asset or liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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