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BORROWINGS (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Repurchase Agreements	$ 222,004	$ 230,612
Total short-term borrowings	572,073	530,129
Long-term Federal Home Loan Bank Advances	10,000	10,000
Total long-term borrowings	10,756	10,791
Short-term Debt [Member]
Debt Instrument [Line Items]
Repurchase Agreements	350,000	210,000
FHLBB advances less than 90 days	222,004	225,605
FHLBB and correspondent bank overnight borrowings	0	89,450
Capital lease obligation	69	67
Long-term Debt [Member]
Debt Instrument [Line Items]
Capital lease obligation	756	791
Commercial and Industrial Sector [Member] | Short-term Debt [Member]
Debt Instrument [Line Items]
Repurchase Agreements	$ 0	$ 5,007

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Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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