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FAIR VALUE MEASUREMENTS - Significant Unobservable Inputs for Recurring Assets (Details) $ / contract in Thousands, $ in Thousands	Dec. 31, 2019 USD ($) $ / contract	Dec. 31, 2018 USD ($) $ / contract
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities available for sale	$ 1,311,555	$ 1,399,647
Derivative Asset	80,190	35,654
Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities available for sale	43,982	0
Level 3 | Recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Trading Security	10,769	11,212
Capitalized Servicing Rights	12,299	11,485
Total	$ 68,662	$ 26,624
Level 3 | Recurring | Discounted Cash Flow | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Trading Security Significant unobservable input value	0.0221	0.0307
Level 3 | Recurring | Securities Available for Sale
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities available for sale	$ 42,966
Level 3 | Recurring | Commitments to Lend
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset	$ 2,628	$ 3,927
Level 3 | Recurring | Commitments to Lend | Historical Trend | Closing Ratio
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Commitments to Lend, significant unobservable input value	0.7781	0.8236
Level 3 | Recurring | Commitments to Lend | Pricing Model | Origination Costs, per loan
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Commitments to Lend, significant unobservable input value | $ / contract	3,137
Level 3 | Recurring | Capitalized Servicing Rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Capitalized Servicing Rights	$ 12,299	$ 11,485
Level 3 | Recurring | Capitalized Servicing Rights | Discounted Cash Flow | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Capitalized Servicing Rights, significant unobservable input value	0.1000	0.1000
Level 3 | Recurring | Capitalized Servicing Rights | Discounted Cash Flow | Constant prepayment rate (CPR)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Capitalized Servicing Rights, significant unobservable input value	0.1150	0.0930
Level 3 | Recurring | Capitalized Servicing Rights | Pricing Model | Origination Costs, per loan
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Commitments to Lend, significant unobservable input value | $ / contract		3,063
Minimum | Level 3 | Recurring | Securities Available for Sale | Indication from Market Maker | Measurement Input, Price Indication
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities Available for Sale, significant unobservable input value	0.9700
Maximum | Level 3 | Recurring | Securities Available for Sale | Indication from Market Maker | Measurement Input, Price Indication
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities Available for Sale, significant unobservable input value	1

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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