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FAIR VALUE (Details) (USD $) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Available-for-sale investment securities: |  |
Total available-for-sale investment securities | $ 2,465,931,000 | $ 2,186,163,000
Assets and Liabilities Measured on Nonrecurring Basis [Abstract] |  |
Discount on appraisal value of foreclosed real estate, minimum (in hundredths) | 10.00% |
Discount on appraisal value of foreclosed real estate, maximum (in hundredths) | 75.00% |
Impaired loans valuation allowance | 0 |
Fair value of MSRs at end of period | 1,400,000 |
Carrying value before valuation allowance at end of period | 1,100,000 |
Recurring [Member] |  |
Available-for-sale investment securities: |  |
U.S. Treasury and agency securities | 1,486,627,000 | 1,212,147,000
Obligations of state and political subdivisions | 688,334,000 | 668,982,000
Government agency mortgage-backed securities | 244,122,000 | 254,978,000
Corporate debt securities | 27,287,000 | 27,587,000
Government agency collateralized mortgage obligations | 19,130,000 | 22,048,000
Marketable equity securities | 431,000 | 421,000
Total available-for-sale investment securities | 2,465,931,000 | 2,186,163,000
Mortgages loans held for sale | 726,000 | 728,000
Commitments to originate real estate loans for sale | 170,000 | 44,000
Forward sales commitments | (7,000) | 27,000
Total | 2,466,820,000 | 2,186,962,000
Recurring [Member] | Level 1 [Member] |  |
Available-for-sale investment securities: |  |
U.S. Treasury and agency securities | 1,465,231,000 | 1,182,261,000
Obligations of state and political subdivisions | 0 | 0
Government agency mortgage-backed securities | 0 | 0
Corporate debt securities | 0 | 0
Government agency collateralized mortgage obligations | 0 | 0
Marketable equity securities | 431,000 | 421,000
Total available-for-sale investment securities | 1,465,662,000 | 1,182,682,000
Mortgages loans held for sale | 0 | 0
Commitments to originate real estate loans for sale | 0 | 0
Forward sales commitments | 0 | 0
Total | 1,465,662,000 | 1,182,682,000
Recurring [Member] | Level 2 [Member] |  |
Available-for-sale investment securities: |  |
U.S. Treasury and agency securities | 21,396,000 | 29,886,000
Obligations of state and political subdivisions | 688,334,000 | 668,982,000
Government agency mortgage-backed securities | 244,122,000 | 254,978,000
Corporate debt securities | 27,287,000 | 27,587,000
Government agency collateralized mortgage obligations | 19,130,000 | 22,048,000
Marketable equity securities | 0 | 0
Total available-for-sale investment securities | 1,000,269,000 | 1,003,481,000
Mortgages loans held for sale | 726,000 | 728,000
Commitments to originate real estate loans for sale | 0 | 0
Forward sales commitments | (7,000) | 27,000
Total | 1,000,988,000 | 1,004,236,000
Mortgage loans held for sale, at principal value | 700,000 |
Mortgage loans held for sale, unrealized gains (losses) | 20,000 |
Recurring [Member] | Level 3 [Member] |  |
Available-for-sale investment securities: |  |
U.S. Treasury and agency securities | 0 | 0
Obligations of state and political subdivisions | 0 | 0
Government agency mortgage-backed securities | 0 | 0
Corporate debt securities | 0 | 0
Government agency collateralized mortgage obligations | 0 | 0
Marketable equity securities | 0 | 0
Total available-for-sale investment securities | 0 | 0
Mortgages loans held for sale | 0 | 0
Commitments to originate real estate loans for sale | 170,000 | 44,000
Forward sales commitments | 0 | 0
Total | 170,000 | 44,000
Non-recurring [Member] |  |
Assets and Liabilities Measured on Nonrecurring Basis [Abstract] |  |
Impaired loans | 0 | 600,000
Other real estate owned | 3,619,000 | 5,060,000
Total | 3,619,000 | 5,660,000
Non-recurring [Member] | Level 1 [Member] |  |
Assets and Liabilities Measured on Nonrecurring Basis [Abstract] |  |
Impaired loans | 0 | 0
Other real estate owned | 0 | 0
Total | 0 | 0
Non-recurring [Member] | Level 2 [Member] |  |
Assets and Liabilities Measured on Nonrecurring Basis [Abstract] |  |
Impaired loans | 0 | 600,000
Other real estate owned | 0 | 0
Total | 0 | 600,000
Non-recurring [Member] | Level 3 [Member] |  |
Assets and Liabilities Measured on Nonrecurring Basis [Abstract] |  |
Impaired loans | 0 | 0
Other real estate owned | 3,619,000 | 5,060,000
Total | $ 3,619,000 | $ 5,060,000

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