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FAIR VALUE MEASUREMENTS - Unobservable Inputs Non-recurring (Details) $ in Thousands	Jun. 30, 2019 USD ($) $ / contract	Dec. 31, 2018 USD ($) $ / contract
Quantitative information about the significant unobservable inputs within Level 3
Other real estate owned	$ 154	$ 0
Non-recurring | Level 3
Quantitative information about the significant unobservable inputs within Level 3
Impaired loans	4,614	4,892
Capitalized servicing rights	14,221	11,891
Other real estate owned	154	0
Total	18,989	16,783
Non-recurring | Fair Value of Collateral | Level 3
Quantitative information about the significant unobservable inputs within Level 3
Impaired loans	$ 4,614	$ 4,892
Non-recurring | Minimum | Loss severity | Fair Value of Collateral | Level 3
Quantitative information about the significant unobservable inputs within Level 3
Impaired loans, significant unobservable input value	0.0011	0.0000
Non-recurring | Minimum | Appraised value | Fair Value of Collateral | Level 3
Quantitative information about the significant unobservable inputs within Level 3
Impaired loans, significant unobservable input value | $ / contract	300	300
Non-recurring | Maximum | Loss severity | Fair Value of Collateral | Level 3
Quantitative information about the significant unobservable inputs within Level 3
Impaired loans, significant unobservable input value	0.2566	0.5116
Non-recurring | Maximum | Appraised value | Fair Value of Collateral | Level 3
Quantitative information about the significant unobservable inputs within Level 3
Impaired loans, significant unobservable input value | $ / contract	731,000	877,000
Non-recurring | Weighted Average | Loss severity | Fair Value of Collateral | Level 3
Quantitative information about the significant unobservable inputs within Level 3
Impaired loans, significant unobservable input value	0.0344	0.0675
Non-recurring | Weighted Average | Appraised value | Fair Value of Collateral | Level 3
Quantitative information about the significant unobservable inputs within Level 3
Impaired loans, significant unobservable input value | $ / contract	316,800	363,000
Non-recurring | Capitalized servicing rights | Discounted Cash Flow | Level 3
Quantitative information about the significant unobservable inputs within Level 3
Capitalized servicing rights	$ 14,221	$ 11,891
Non-recurring | Capitalized servicing rights | Minimum | Constant prepayment rate (CPR) | Discounted Cash Flow | Level 3
Quantitative information about the significant unobservable inputs within Level 3
Servicing asset, significant unobservable input value	0.0840	0.0774
Non-recurring | Capitalized servicing rights | Minimum | Discount rate | Discounted Cash Flow | Level 3
Quantitative information about the significant unobservable inputs within Level 3
Servicing asset, significant unobservable input value	0.1000	0.1000
Non-recurring | Capitalized servicing rights | Maximum | Constant prepayment rate (CPR) | Discounted Cash Flow | Level 3
Quantitative information about the significant unobservable inputs within Level 3
Servicing asset, significant unobservable input value	0.1273	0.1129
Non-recurring | Capitalized servicing rights | Maximum | Discount rate | Discounted Cash Flow | Level 3
Quantitative information about the significant unobservable inputs within Level 3
Servicing asset, significant unobservable input value	0.1273	0.1413
Non-recurring | Capitalized servicing rights | Weighted Average | Constant prepayment rate (CPR) | Discounted Cash Flow | Level 3
Quantitative information about the significant unobservable inputs within Level 3
Servicing asset, significant unobservable input value	0.1150	0.0974
Non-recurring | Capitalized servicing rights | Weighted Average | Discount rate | Discounted Cash Flow | Level 3
Quantitative information about the significant unobservable inputs within Level 3
Servicing asset, significant unobservable input value	0.1130	0.1199
Other Real Estate Owned | Non-recurring | Fair Value of Collateral | Level 3
Quantitative information about the significant unobservable inputs within Level 3
Other real estate owned	$ 154
Other Real Estate Owned | Non-recurring | Minimum | Appraised value | Fair Value of Collateral | Level 3
Quantitative information about the significant unobservable inputs within Level 3
Impaired loans, significant unobservable input value | $ / contract	49,000
Other Real Estate Owned | Non-recurring | Maximum | Appraised value | Fair Value of Collateral | Level 3
Quantitative information about the significant unobservable inputs within Level 3
Impaired loans, significant unobservable input value | $ / contract	105,000
Other Real Estate Owned | Non-recurring | Weighted Average | Appraised value | Fair Value of Collateral | Level 3
Quantitative information about the significant unobservable inputs within Level 3
Impaired loans, significant unobservable input value | $ / contract	87,000

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

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