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SHORT-TERM BORROWINGS AND LONG-TERM DEBT (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
LONG-TERM DEBT
Short-term borrowings	$ 21,000,000	$ 135,000,000
Long term borrowings	92,785,000	92,785,000
Investment securities pledged as collateral	1,100,000,000	1,050,000,000
Federal Home Loan Bank Borrowings
LONG-TERM DEBT
Line of Credit, maximum borrowing capacity	1,439,149,367	1,412,190,268
Unused borrowings available	1,420,000,000	1,280,000,000
Short-term borrowings	21,000,000	135,000,000
Long term borrowings	0	0
Investment securities pledged as collateral	200,000
Commercial real estate and commercial loans pledged as collateral	1,870,000,000
Federal Reserve discount window line of credit
LONG-TERM DEBT
Unused borrowings available	68,100,000	63,700,000
Commercial real estate and commercial loans pledged as collateral	$ 129,900,000	$ 129,900,000

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The sum of the carrying amounts, as of the date of the latest financial statement presented, of loans receivable which are owned but transferred to serve as collateral for the payment of related debt obligations, primarily secured borrowings and repurchase agreements, and for which the transferees are not permitted to sell or re-pledge them to an unrelated party.

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The carrying amount as of the date of the latest financial statement presented of mortgage-related securities classified as available for sale or held for investment which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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