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FAIR VALUE - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2017
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. |  |  |  |  |  |  |  |  |
Mortgage servicing rights | $ 4,700,000 |  |  | $ 4,700,000 |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  |  | 3.94% |  |  |  |  |
Weighted average maturity of residential mortgages |  |  |  | 20 years |  |  |  |  |
Prepayment Speed used in unobservable assumptions |  |  |  | 65 |  | 81 |  |  |
Discount rate used to estimate fair value (in hundredths) |  |  |  | 9.40% |  | 9.40% |  |  |
Subtotal | 4,024,611,000 |  |  | $ 4,024,611,000 |  | $ 3,916,326,000 |  |  |
Valuation allowance | 50,628,000 | $ 48,343,000 |  | 50,628,000 | $ 48,343,000 | $ 48,453,000 | $ 50,564,000 | $ 47,706,000 | $ 47,121,000
Provision for Loan and Lease Losses | 1,000,000 | 1,100,000 |  | 2,985,000 | 6,100,000 |  |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts | 285,000 | 118,000 |  | 779,000 | 808,000 |  |  |  |
Minimum |  |  |  |  |  |  |  |  |
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. |  |  |  |  |  |  |  |  |
Amount of variance |  |  |  | $ 100,000 |  |  |  |  |
Commercial Real Estates | Minimum | Level 3 |  |  |  |  |  |  |  |  |
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. |  |  |  |  |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  |  | 0.00% |  |  |  |  |
Commercial Real Estates | Maximum | Level 3 |  |  |  |  |  |  |  |  |
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. |  |  |  |  |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  |  | 50.00% |  |  |  |  |
Inventory Finished Goods | Minimum | Level 3 |  |  |  |  |  |  |  |  |
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. |  |  |  |  |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  |  | 35.00% |  |  |  |  |
Inventory Finished Goods | Maximum | Level 3 |  |  |  |  |  |  |  |  |
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. |  |  |  |  |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  |  | 65.00% |  |  |  |  |
Finished Goods | Minimum | Level 3 |  |  |  |  |  |  |  |  |
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. |  |  |  |  |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  |  | 30.00% |  |  |  |  |
Finished Goods | Maximum | Level 3 |  |  |  |  |  |  |  |  |
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. |  |  |  |  |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  |  | 60.00% |  |  |  |  |
Inventory Work In Process | Minimum | Level 3 |  |  |  |  |  |  |  |  |
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. |  |  |  |  |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  |  | 50.00% |  |  |  |  |
Inventory Work In Process | Maximum | Level 3 |  |  |  |  |  |  |  |  |
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. |  |  |  |  |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  |  | 100.00% |  |  |  |  |
Equipment | Minimum | Level 3 |  |  |  |  |  |  |  |  |
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. |  |  |  |  |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  |  | 30.00% |  |  |  |  |
Equipment | Maximum | Level 3 |  |  |  |  |  |  |  |  |
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. |  |  |  |  |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  |  | 70.00% |  |  |  |  |
Marketable Securities | Minimum | Level 3 |  |  |  |  |  |  |  |  |
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. |  |  |  |  |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  |  | 10.00% |  |  |  |  |
Marketable Securities | Maximum | Level 3 |  |  |  |  |  |  |  |  |
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. |  |  |  |  |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  |  | 30.00% |  |  |  |  |
Impaired Loans |  |  |  |  |  |  |  |  |
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. |  |  |  |  |  |  |  |  |
Subtotal | 20,400,000 | 15,000,000.0 |  | $ 20,400,000 | 15,000,000.0 |  |  |  |
Valuation allowance | 10,100,000 | 5,500,000 |  | 10,100,000 | 5,500,000 |  |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts | $ 500,000 | $ 3,800,000 |  | $ 600,000 | $ 8,300,000 |  |  |  |
Charge Off |  |  | $ 4,600,000 |  |  |  |  |  |
Municipal Notes | Minimum |  |  |  |  |  |  |  |  |
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. |  |  |  |  |  |  |  |  |
Percentage of Variance |  |  |  | (5.00%) |  |  |  |  |
Municipal Notes | Maximum |  |  |  |  |  |  |  |  |
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. |  |  |  |  |  |  |  |  |
Percentage of Variance |  |  |  | 5.00% |  |  |  |  |
US Government Agencies Short-term Debt Securities | Minimum |  |  |  |  |  |  |  |  |
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. |  |  |  |  |  |  |  |  |
Percentage of Variance |  |  |  | (3.00%) |  |  |  |  |
US Government Agencies Short-term Debt Securities | Maximum |  |  |  |  |  |  |  |  |
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. |  |  |  |  |  |  |  |  |
Percentage of Variance |  |  |  | 3.00% |  |  |  |  |
US Treasury Securities | Minimum |  |  |  |  |  |  |  |  |
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. |  |  |  |  |  |  |  |  |
Percentage of Variance |  |  |  | (1.00%) |  |  |  |  |
US Treasury Securities | Maximum |  |  |  |  |  |  |  |  |
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. |  |  |  |  |  |  |  |  |
Percentage of Variance |  |  |  | 1.00% |  |  |  |  |

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