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FAIR VALUE MEASUREMENTS - Fair Values and Carrying Amounts (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financial Assets
Trading security, at fair value	$ 11,795	$ 12,277
Securities available for sale and other	1,460,660	1,426,099
Securities held to maturity	394,296	405,276
FHLB bank stock and restricted securities	64,038	63,085
Level 1
Financial Assets
Cash and cash equivalents	123,887	248,763
Trading security, at fair value	0	0
Securities available for sale and other	58,630	44,850
Securities held to maturity	0	0
Net loans	0	0
Loans held for sale	0	0
Accrued interest receivable	0	0
Cash surrender value of bank-owned life insurance policies	0
Derivative assets	0
Assets held for sale	0	0
Financial Liabilities
Total deposits	0	0
Short-term debt	0	0
Long-term Federal Home Loan Bank advances	0	0
Subordinated borrowings	0	0
Derivative liabilities	909	104
Level 2
Financial Assets
Cash and cash equivalents	0	0
Trading security, at fair value	0	0
Securities available for sale and other	1,402,030	1,381,249
Securities held to maturity	361,142	371,458
Net loans	0	0
Loans held for sale	98,440	153,620
Accrued interest receivable	30,585	33,739
Cash surrender value of bank-owned life insurance policies	192,379
Derivative assets	19,949	14,049
Assets held for sale	1,392	1,392
Financial Liabilities
Total deposits	8,652,801	8,731,527
Short-term debt	836,095	667,246
Long-term Federal Home Loan Bank advances	285,102	378,766
Subordinated borrowings	96,794	97,414
Derivative liabilities	21,051	15,715
Level 3
Financial Assets
Cash and cash equivalents	0	0
Trading security, at fair value	11,795	12,277
Securities available for sale and other	0	0
Securities held to maturity	33,154	33,818
Net loans	8,451,273	8,422,034
Loans held for sale	0	0
Accrued interest receivable	0	0
Cash surrender value of bank-owned life insurance policies	0
Derivative assets	6,531	5,259
Assets held for sale	0	0
Financial Liabilities
Total deposits	0	0
Short-term debt	0	0
Long-term Federal Home Loan Bank advances	0	0
Subordinated borrowings	0	0
Derivative liabilities	0	19
Carrying Amount
Financial Assets
Cash and cash equivalents	123,887	248,763
Trading security, at fair value	11,795	12,277
Securities available for sale and other	1,460,660	1,426,099
Securities held to maturity	395,337	397,103
FHLB bank stock and restricted securities	64,038	63,085
Net loans	8,322,558	8,247,504
Loans held for sale	98,440	153,620
Accrued interest receivable	30,585	33,739
Cash surrender value of bank-owned life insurance policies	192,379
Derivative assets	26,480	19,308
Assets held for sale	1,392	1,392
Financial Liabilities
Total deposits	8,683,267	8,749,530
Short-term debt	835,892	667,300
Long-term Federal Home Loan Bank advances	289,969	380,436
Subordinated borrowings	89,384	89,339
Derivative liabilities	21,960	15,838
Total Fair Value
Financial Assets
Cash and cash equivalents	123,887	248,763
Trading security, at fair value	11,795	12,277
Securities available for sale and other	1,460,660	1,426,099
Securities held to maturity	394,296	405,276
Net loans	8,451,273	8,422,034
Loans held for sale	98,440	153,620
Accrued interest receivable	30,585	33,739
Cash surrender value of bank-owned life insurance policies	192,379
Derivative assets	26,480	19,308
Assets held for sale	1,392	1,392
Financial Liabilities
Total deposits	8,652,801	8,731,527
Short-term debt	836,095	667,246
Long-term Federal Home Loan Bank advances	285,102	378,766
Subordinated borrowings	96,794	97,414
Derivative liabilities	$ 21,960	$ 15,838

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Amount classified as assets attributable to disposal group held for sale or disposed of.

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Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

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Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

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Fair value of investments in debt securities classified as held-to-maturity.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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