BORROWINGS Short-Term and Long-Term Borrowings (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Aug. 31, 2013
Short-term borrowings:
FHLB advances maturing within one year	$ 375,500,000	$ 250,500,000
Long-term debt:
FHLB advances maturing beyond one year	118,942,000	104,651,000
Subordinated term loan due 2018	7,166,000	7,060,000
Subordinated notes due 2023	38,050,000	38,050,000	$ 38,050,000
Capital lease obligations and other debt	5,752,000	5,972,000
Long-term debt	194,967,000	180,164,000
Short-term borrowings	375,500,000	250,500,000
Revolving Credit Facility
Long-term debt:
Line of credit facility	0
Line of Credit Facility, Current Borrowing Capacity	$ 15,000,000
Revolving Credit Facility | London Interbank Offered Rate (LIBOR)
Long-term debt:
Debt instrument, basis spread on variable rate	4.00%
Minimum
Long-term debt:
Percentage of collateral that may be borrowed (as a percent)	60.00%
Maximum
Long-term debt:
Percentage of collateral that may be borrowed (as a percent)	65.00%
Line of Credit
Long-term debt:
Loans pledged as collateral	$ 656,807,000
Federal Reserve Bank Advances
Long-term debt:
Long-term debt		0
Federal Funds Purchased | Line of Credit
Long-term debt:
Short-term borrowings	185,000,000
Line of Credit Facility, Fair Value of Amount Outstanding	0	0
Maturing October 7, 2033
Long-term debt:
Junior subordinated debt to unconsolidated trusts:	5,701,000	5,629,000
Maturing December 15, 2033
Long-term debt:
Junior subordinated debt to unconsolidated trusts:	6,853,000	6,687,000
Maturing December 15, 2037
Long-term debt:
Junior subordinated debt to unconsolidated trusts:	12,503,000	$ 12,115,000
Federal Reserve Bank Advances | Line of Credit
Long-term debt:
Loans pledged as collateral	4,881,000
Federal Reserve Bank Advances
Long-term debt:
Long-term debt	$ 0