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FAIR VALUE MEASUREMENTS - Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale $ 1,410,078 $ 1,399,647
Marketable equity securities 59,578 56,638
Total Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading security 11,210 11,212
Securities available for sale 1,410,078 1,399,647
Marketable equity securities 59,578 56,638
Loans held for sale 370,114 96,233
Derivative assets 85,769 35,654
Derivative liabilities 80,875 33,973
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading security 0 0
Securities available for sale 0 0
Marketable equity securities 58,521 56,074
Loans held for sale 0 0
Derivative assets 0 0
Derivative liabilities 1,144 734
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading security 0 0
Securities available for sale 1,410,078 1,399,647
Marketable equity securities 1,057 564
Loans held for sale 191,548 96,233
Derivative assets 76,764 31,727
Derivative liabilities 79,731 33,239
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading security 11,210 11,212
Securities available for sale 0 0
Marketable equity securities 0 0
Loans held for sale 178,566 0
Derivative assets 9,005 3,927
Derivative liabilities 0 0
Recurring | Total Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading security 11,210 11,212
Loans held for sale 191,548 96,233
Derivative assets 85,769 35,654
Capitalized servicing rights 11,206 11,485
Derivative liabilities 80,875 33,973
Recurring | Total Fair Value | Debt securities | Municipal bonds and obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 119,873 111,207
Recurring | Total Fair Value | Debt securities | Agency collateralized mortgage obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 888,962 930,884
Recurring | Total Fair Value | Debt securities | Agency residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 182,258 170,321
Recurring | Total Fair Value | Debt securities | Agency commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 60,651 58,925
Recurring | Total Fair Value | Debt securities | Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 119,743 111,490
Recurring | Total Fair Value | Debt securities | Trust preferred securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 8,550 8,466
Recurring | Total Fair Value | Debt securities | Other bonds and obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 30,041 8,354
Recurring | Total Fair Value | Marketable equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securities 59,578 56,638
Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading security 0 0
Loans held for sale 0 0
Derivative assets 0 0
Capitalized servicing rights 0 0
Derivative liabilities 1,144 734
Recurring | Level 1 | Debt securities | Municipal bonds and obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Recurring | Level 1 | Debt securities | Agency collateralized mortgage obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Recurring | Level 1 | Debt securities | Agency residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Recurring | Level 1 | Debt securities | Agency commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Recurring | Level 1 | Debt securities | Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Recurring | Level 1 | Debt securities | Trust preferred securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Recurring | Level 1 | Debt securities | Other bonds and obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Recurring | Level 1 | Marketable equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securities 58,521 56,074
Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading security 0 0
Loans held for sale 191,548 96,233
Derivative assets 76,764 31,727
Capitalized servicing rights 0 0
Derivative liabilities 79,731 33,239
Recurring | Level 2 | Debt securities | Municipal bonds and obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 119,873 111,207
Recurring | Level 2 | Debt securities | Agency collateralized mortgage obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 888,962 930,884
Recurring | Level 2 | Debt securities | Agency residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 182,258 170,321
Recurring | Level 2 | Debt securities | Agency commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 60,651 58,925
Recurring | Level 2 | Debt securities | Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 119,743 111,490
Recurring | Level 2 | Debt securities | Trust preferred securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 8,550 8,466
Recurring | Level 2 | Debt securities | Other bonds and obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 30,041 8,354
Recurring | Level 2 | Marketable equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securities 1,057 564
Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading security 11,210 11,212
Loans held for sale 0 0
Derivative assets 9,005 3,927
Capitalized servicing rights 11,206 11,485
Derivative liabilities 0 0
Recurring | Level 3 | Debt securities | Municipal bonds and obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Recurring | Level 3 | Debt securities | Agency collateralized mortgage obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Recurring | Level 3 | Debt securities | Agency residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Recurring | Level 3 | Debt securities | Agency commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Recurring | Level 3 | Debt securities | Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Recurring | Level 3 | Debt securities | Trust preferred securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Recurring | Level 3 | Debt securities | Other bonds and obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Recurring | Level 3 | Marketable equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securities $ 0 $ 0