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FAIR VALUE MEASUREMENT AND DISCLOSURE (Tables) | 9 Months Ended
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Sep. 30, 2017
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, 2017 and December 31, 2016, 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, 2017 |  |  |  |  |  |  |  |  |  |
Financial assets: |  |  |  |  |  |  |  |  |  |
Loans held for sale | $ | 12,997 |  |  | $ | — |  |  | $ | 12,997 |  |  | $ | — |
AFS securities: |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | 7,365 |  |  | — |  |  | 7,365 |  |  | — |
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises | 521,104 |  |  | — |  |  | 521,104 |  |  | — |
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises | 262,390 |  |  | — |  |  | 262,390 |  |  | — |
Subordinated corporate bonds | 5,651 |  |  | — |  |  | 5,651 |  |  | — |
Equity securities | 741 |  |  | — |  |  | 741 |  |  | — |
Customer loan swaps | 3,482 |  |  | — |  |  | 3,482 |  |  | — |
Fixed-rate interest rate lock commitments | 495 |  |  | — |  |  | 495 |  |  | — |
Forward delivery commitments | 332 |  |  | — |  |  | 332 |  |  | — |
Financial liabilities: |  |  |  |  |  |  |  |  |  |
Junior subordinated debt interest rate swaps | 8,123 |  |  | — |  |  | 8,123 |  |  | — |
FHLBB advance interest rate swaps | 98 |  |  | — |  |  | 98 |  |  | — |
Customer loan swaps | 3,482 |  |  | — |  |  | 3,482 |  |  | — |
Fixed-rate interest rate lock commitments | 25 |  |  | — |  |  | 25 |  |  | — |
Forward delivery commitments | 19 |  |  | — |  |  | 19 |  |  | — |
December 31, 2016 |  |  |  |  |  |  |  |  |  |
Financial assets: |  |  |  |  |  |  |  |  |  |
Loans held for sale | $ | 14,836 |  |  | $ | — |  |  | $ | 14,836 |  |  | $ | — |
AFS securities: |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | 9,001 |  |  | — |  |  | 9,001 |  |  | — |
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises | 480,622 |  |  | — |  |  | 480,622 |  |  | — |
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises | 283,890 |  |  | — |  |  | 283,890 |  |  | — |
Subordinated corporate bonds | 5,613 |  |  | — |  |  | 5,613 |  |  | — |
Equity securities | 741 |  |  | — |  |  | 741 |  |  | — |
Customer loan swaps | 1,945 |  |  | — |  |  | 1,945 |  |  | — |
Fixed-rate interest rate lock commitments | 202 |  |  | — |  |  | 202 |  |  | — |
Forward delivery commitments | 587 |  |  | — |  |  | 587 |  |  | — |
Financial liabilities: |  |  |  |  |  |  |  |  |
Junior subordinated debt interest rate swaps | 8,372 |  |  | — |  |  | 8,372 |  |  | — |
FHLBB advance interest rate swaps | 389 |  |  | — |  |  | 389 |  |  | — |
Customer loan swaps | 1,945 |  |  | — |  |  | 1,945 |  |  | — |
Fixed-rate interest rate lock commitments | 15 |  |  | — |  |  | 15 |  |  | — |
Forward delivery commitments | 309 |  |  | — |  |  | 309 |  |  | — |
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, 2017 and December 31, 2016.
| Fair Value |  | Readily Available Market Prices (Level 1) |  | Observable Market Data (Level 2) |  | Company Determined Fair Value (Level 3)
September 30, 2017 |  |  |  |  |  |  |  |  |  |
Financial assets: |  |  |  |  |  |  |  |  |  |
Collateral-dependent impaired loans | $ | 3,276 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,276 |
MSRs(1) | 330 |  |  | — |  |  | — |  |  | 330 |
Non-financial assets: |  |  |  |  |  |  |
OREO | 341 |  |  | — |  |  | — |  |  | 341 |
December 31, 2016 |  |  |  |  |  |  |  |  |  |
Financial assets: |  |  |  |  |  |  |  |  |  |
Collateral-dependent impaired loans | $ | 500 |  |  | $ | — |  |  | $ | — |  |  | $ | 500 |
MSRs(1) | 1,090 |  |  | — |  |  | — |  |  | 1,090 |
Non-financial assets: |  |  |  |  |  |  |  |  |  |
OREO | 922 |  |  | — |  |  | — |  |  | 922 |
(1) Represents MSRs deemed to be impaired and a valuation allowance was established to carry at fair value.
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, 2017 and December 31, 2016:
| Fair Value |  | Valuation Methodology |  | Unobservable input |  | Discount Range (Weighted-Average)
September 30, 2017 |  |  |  |  |  |  |  |
Collateral-dependent impaired loans: |  |  |  |  |  |  |  |  |
Partially charged-off | $ | 166 |  |  | Market approach appraisal of collateral |  | Management adjustment of appraisal |  | 0-50% | (9%)
|  |  |  |  | Estimated selling costs |  | 0 - 10% | (3%)
Specifically reserved | 3,110 |  |  | Market approach appraisal of collateral |  | Management adjustment of appraisal |  | 0% | (0%)
|  |  |  |  | Estimated selling costs |  | 10% | (10%)
MSR | 330 |  |  | Discounted cash flow |  | Prepayment rate |  | 14% | (14%)
|  |  |  |  | Discount rate |  | 7% | (7%)
OREO | 341 |  |  | Market approach appraisal of collateral |  | Management adjustment of appraisal |  | 0% | (0%)
|  |  |  |  | Estimated selling cost |  | 10% | (10%)
December 31, 2016 |  |  |  |  |  |  |  |  |
Collateral-dependent impaired loans: |  |  |  |  |  |  |  |  |
Partially charged-off | $ | 166 |  |  | Market approach appraisal of collateral |  | Management adjustment of appraisal |  | 0% | (0%)
|  |  |  |  | Estimated selling costs |  | 0 - 10% | (5%)
Specifically reserved | 344 |  |  | Market approach appraisal of collateral |  | Management adjustment of appraisal |  | 0 - 50% | (13%)
|  |  |  |  | Estimated selling costs |  | 10 - 28% | (12%)
MSR | 1,090 |  |  | Discounted cash flow |  | Prepayment rate |  | 15% | (15%)
|  |  |  |  | Discount rate |  | 8% | (8%)
OREO | 922 |  |  | Market approach appraisal of collateral |  | Management adjustment of appraisal |  | 0 - 73% | (7%)
|  |  |  |  | Estimated selling costs |  | 10% | (10%)
Carrying Amounts and Estimated Fair Value for Financial Instrument Assets and Liabilities | The following table presents the carrying amounts and estimated fair value for financial instrument assets and liabilities measured at September 30, 2017:
| Carrying Amount |  | Fair Value |  | Readily Available Market Prices (Level 1) |  | Observable Market Prices (Level 2) |  | Company Determined Market Prices (Level 3)
Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks | $ | 89,435 |  |  | $ | 89,435 |  |  | $ | 89,435 |  |  | $ | — |  |  | $ | — |
AFS securities | 797,251 |  |  | 797,251 |  |  | — |  |  | 797,251 |  |  | — |
HTM securities | 94,207 |  |  | 95,094 |  |  | — |  |  | 95,094 |  |  | — |
Loans held for sale | 12,997 |  |  | 12,997 |  |  | — |  |  | 12,997 |  |  | — |
Residential real estate loans(1) | 848,309 |  |  | 854,198 |  |  | — |  |  | — |  |  | 854,198 |
Commercial real estate loans(1) | 1,119,087 |  |  | 1,082,977 |  |  | — |  |  | — |  |  | 1,082,977 |
Commercial loans(1)(2) | 412,402 |  |  | 409,833 |  |  | — |  |  | — |  |  | 409,833 |
Home equity loans(1) | 326,151 |  |  | 323,943 |  |  | — |  |  | — |  |  | 323,943 |
Consumer loans(1) | 17,928 |  |  | 17,465 |  |  | — |  |  | — |  |  | 17,465 |
MSRs(3) | 1,109 |  |  | 1,740 |  |  | — |  |  | — |  |  | 1,740 |
Interest receivable | 9,415 |  |  | 9,415 |  |  | — |  |  | 9,415 |  |  | — |
Customer loan swaps | 3,482 |  |  | 3,482 |  |  | — |  |  | 3,482 |  |  | — |
Fixed-rate interest rate lock commitments | 495 |  |  | 495 |  |  | — |  |  | 495 |  |  | — |
Forward delivery commitments | 332 |  |  | 332 |  |  | — |  |  | 332 |  |  | — |
Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Deposits | $ | 2,956,413 |  |  | $ | 2,953,386 |  |  | $ | — |  |  | $ | 2,953,386 |  |  | $ | — |
Short-term borrowings | 538,997 |  |  | 538,861 |  |  | — |  |  | 538,861 |  |  | — |
Long-term borrowings | 10,738 |  |  | 10,816 |  |  | — |  |  | 10,816 |  |  | — |
Subordinated debentures | 58,872 |  |  | 42,090 |  |  | — |  |  | 42,090 |  |  | — |
Interest payable | 574 |  |  | 574 |  |  | — |  |  | 574 |  |  | — |
Junior subordinated debt interest rate swaps | 8,123 |  |  | 8,123 |  |  | — |  |  | 8,123 |  |  | — |
FHLBB advance interest rate swaps | 98 |  |  | 98 |  |  | — |  |  | 98 |  |  | — |
Customer loan swaps | 3,482 |  |  | 3,482 |  |  | — |  |  | 3,482 |  |  | — |
Fixed-rate interest rate lock commitments | 25 |  |  | 25 |  |  | — |  |  | 25 |  |  | — |
Forward delivery commitments | 19 |  |  | 19 |  |  | — |  |  | 19 |  |  | — |
(1) | The presented carrying amount is net of the allocated ALL.
(2) | Includes the HPFC loan portfolio.
(3) | Reported fair value represents all MSRs currently being serviced by the Company.
The following table presents the carrying amounts and estimated fair value for financial instrument assets and liabilities measured at December 31, 2016:
| Carrying Amount |  | Fair Value |  | Readily Available Market Prices (Level 1) |  | Observable Market Prices (Level 2) |  | Company Determined Market Prices (Level 3)
Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks | $ | 87,707 |  |  | $ | 87,707 |  |  | $ | 87,707 |  |  | $ | — |  |  | $ | — |
AFS securities | 779,867 |  |  | 779,867 |  |  | — |  |  | 779,867 |  |  | — |
HTM securities | 94,609 |  |  | 94,596 |  |  | — |  |  | 94,596 |  |  | — |
Loans held for sale | 14,836 |  |  | 14,836 |  |  | — |  |  | 14,836 |  |  | — |
Residential real estate loans(1) | 798,334 |  |  | 800,122 |  |  | — |  |  | — |  |  | 800,122 |
Commercial real estate loans(1) | 1,038,626 |  |  | 1,006,249 |  |  | — |  |  | — |  |  | 1,006,249 |
Commercial loans(1)(2) | 389,624 |  |  | 391,493 |  |  | — |  |  | — |  |  | 391,493 |
Home equity loans(1) | 327,713 |  |  | 327,292 |  |  | — |  |  | — |  |  | 327,292 |
Consumer loans(1) | 17,151 |  |  | 16,845 |  |  | — |  |  | — |  |  | 16,845 |
MSRs(3) | 1,210 |  |  | 1,701 |  |  | — |  |  | — |  |  | 1,701 |
Interest receivable | 8,654 |  |  | 8,654 |  |  | — |  |  | 8,654 |  |  | — |
Customer loan swaps | 1,945 |  |  | 1,945 |  |  | — |  |  | 1,945 |  |  | — |
Fixed-rate interest rate lock commitments | 202 |  |  | 202 |  |  | — |  |  | 202 |  |  | — |
Forward delivery commitments | 587 |  |  | 587 |  |  | — |  |  | 587 |  |  | — |
Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits | $ | 2,828,529 |  |  | $ | 2,826,484 |  |  | $ | — |  |  | $ | 2,826,484 |  |  | $ | — |
Short-term borrowings | 530,129 |  |  | 530,435 |  |  | — |  |  | 530,435 |  |  | — |
Long-term borrowings | 10,791 |  |  | 10,836 |  |  | — |  |  | 10,836 |  |  | — |
Subordinated debentures | 58,755 |  |  | 41,660 |  |  | — |  |  | 41,660 |  |  | — |
Interest payable | 534 |  |  | 534 |  |  | — |  |  | 534 |  |  | — |
Junior subordinated debt interest rate swaps | 8,372 |  |  | 8,372 |  |  | — |  |  | 8,372 |  |  | — |
FHLBB advance interest rate swaps | 389 |  |  | 389 |  |  | — |  |  | 389 |  |  | — |
Customer loan swaps | 1,945 |  |  | 1,945 |  |  | — |  |  | 1,945 |  |  | — |
Fixed-rate interest rate lock commitments | 15 |  |  | 15 |  |  | — |  |  | 15 |  |  | — |
Forward delivery commitments | 309 |  |  | 309 |  |  | — |  |  | 309 |  |  | — |
(1) | The presented carrying amount is net of the allocated ALL.
(2) | Includes the HPFC loan portfolio.
(3) | Reported fair value represents all MSRs currently being serviced by the Company.

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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 the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13476-108611 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 + 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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