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FAIR VALUE MEASUREMENTS - Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading security, at fair value | $ 11,795 | $ 12,277
Securities available for sale and other, at fair value | 1,460,660 | 1,426,099
Total Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading security, at fair value | 11,795 | 12,277
Securities available for sale and other, at fair value | 1,460,660 | 1,426,099
Loans held for sale | 98,440 | 153,620
Derivative assets | 26,480 | 19,308
Derivative liabilities | 21,960 | 15,838
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading security, at fair value | 0 | 0
Securities available for sale and other, at fair value | 58,630 | 44,850
Loans held for sale | 0 | 0
Derivative assets | 0 |
Derivative liabilities | 909 | 104
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading security, at fair value | 0 | 0
Securities available for sale and other, at fair value | 1,402,030 | 1,381,249
Loans held for sale | 98,440 | 153,620
Derivative assets | 19,949 | 14,049
Derivative liabilities | 21,051 | 15,715
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading security, at fair value | 11,795 | 12,277
Securities available for sale and other, at fair value | 0 | 0
Loans held for sale | 0 | 0
Derivative assets | 6,531 | 5,259
Derivative liabilities | 0 | 19
Recurring | Total Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading security, at fair value | 11,795 | 12,277
Loans held for sale | 98,440 | 153,620
Derivative assets | 26,480 | 19,308
Capitalized servicing rights | 5,705 | 3,834
Derivative liabilities | 21,960 | 15,838
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 and other, at fair value | 114,920 | 118,233
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 and other, at fair value | 912,936 | 851,158
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 and other, at fair value | 190,098 | 216,940
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 and other, at fair value | 60,558 | 62,305
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 and other, at fair value | 101,792 | 110,721
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 and other, at fair value | 11,563 | 11,677
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 and other, at fair value | 9,532 | 9,880
Recurring | Total Fair Value | Marketable equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale and other, at fair value | 59,261 | 45,185
Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading security, at fair value | 0 | 0
Loans held for sale | 0 | 0
Derivative assets | 0 | 0
Capitalized servicing rights | 0 | 0
Derivative liabilities | 909 | 104
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 and other, at fair value | 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 and other, at fair value | 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 and other, at fair value | 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 and other, at fair value | 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 and other, at fair value | 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 and other, at fair value | 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 and other, at fair value | 0 | 0
Recurring | Level 1 | Marketable equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale and other, at fair value | 58,630 | 44,851
Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading security, at fair value | 0 | 0
Loans held for sale | 98,440 | 153,620
Derivative assets | 19,949 | 14,049
Capitalized servicing rights | 0 | 0
Derivative liabilities | 21,051 | 15,715
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 and other, at fair value | 114,920 | 118,233
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 and other, at fair value | 912,936 | 851,158
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 and other, at fair value | 190,098 | 216,940
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 and other, at fair value | 60,558 | 62,305
Recurring | Level 2 | Debt securities | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale and other, at fair value | 101,792 | 110,721
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 and other, at fair value | 11,563 | 11,677
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 and other, at fair value | 9,532 | 9,880
Recurring | Level 2 | Marketable equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale and other, at fair value | 631 | 334
Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading security, at fair value | 11,795 | 12,277
Loans held for sale | 0 | 0
Derivative assets | 6,531 | 5,259
Capitalized servicing rights | 5,705 | 3,834
Derivative liabilities | 0 | 19
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 and other, at fair value | 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 and other, at fair value | 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 and other, at fair value | 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 and other, at fair value | 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 and other, at fair value | 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 and other, at fair value | 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 and other, at fair value | 0 | 0
Recurring | Level 3 | Marketable equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale and other, at fair value | $ 0 | $ 0

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