FAIR VALUE MEASUREMENTS (Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Fair value of assets and liabilities measured on a recurring basis:
Securities available for sale, at fair value		$ 939,409	$ 903,292
Loans held for sale		25,109	36,030
Interest rate swap, assets		7,540	3,758
Cash flow hedges, assets		1,797	946
Derivative assets	[1]	10,589	5,405
Interest rate swap, liabilities		7,540	3,758
Cash flow hedges, liabilities		15,279	10,352
Fair value hedges, liabilities		3,418	888
Significant Other Observable Inputs Level 2 [Member]
Fair value of assets and liabilities measured on a recurring basis:
Securities available for sale, at fair value		939,409	903,292
Loans held for sale		25,109	36,030
Interest rate swap, assets		7,540	3,758
Cash flow hedges, assets		1,797	946
Interest rate swap, liabilities		7,540	3,758
Cash flow hedges, liabilities		15,279	10,352
Fair value hedges, liabilities		3,418	888
Recurring [Member]
Fair value of assets and liabilities measured on a recurring basis:
Loans held for sale		25,109	36,030
Interest rate swap, assets		7,540	3,758
Cash flow hedges, assets		1,797	946
Interest rate swap, liabilities		7,540	3,758
Cash flow hedges, liabilities		15,279	10,352
Fair value hedges, liabilities		$ 3,418	$ 888
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
Fair value of assets and liabilities measured on a recurring basis:
Loans held for sale
Interest rate swap, assets
Cash flow hedges, assets
Interest rate swap, liabilities
Cash flow hedges, liabilities
Fair value hedges, liabilities
Recurring [Member] | Significant Other Observable Inputs Level 2 [Member]
Fair value of assets and liabilities measured on a recurring basis:
Loans held for sale		$ 25,109	$ 36,030
Interest rate swap, assets		7,540	3,758
Cash flow hedges, assets		1,797	946
Interest rate swap, liabilities		7,540	3,758
Cash flow hedges, liabilities		15,279	10,352
Fair value hedges, liabilities		3,418	888
Obligations of States and Political Subdivisions [Member]
Fair value of assets and liabilities measured on a recurring basis:
Securities available for sale, at fair value		265,969	268,079
Obligations of States and Political Subdivisions [Member] | Recurring [Member]
Fair value of assets and liabilities measured on a recurring basis:
Securities available for sale, at fair value		$ 265,969	$ 268,079
Obligations of States and Political Subdivisions [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
Fair value of assets and liabilities measured on a recurring basis:
Securities available for sale, at fair value
Obligations of States and Political Subdivisions [Member] | Recurring [Member] | Significant Other Observable Inputs Level 2 [Member]
Fair value of assets and liabilities measured on a recurring basis:
Securities available for sale, at fair value		$ 265,969	$ 268,079
Corporate and Other Bonds [Member]
Fair value of assets and liabilities measured on a recurring basis:
Securities available for sale, at fair value		93,766	75,979
Corporate and Other Bonds [Member] | Recurring [Member]
Fair value of assets and liabilities measured on a recurring basis:
Securities available for sale, at fair value		$ 93,766	$ 75,979
Corporate and Other Bonds [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
Fair value of assets and liabilities measured on a recurring basis:
Securities available for sale, at fair value
Corporate and Other Bonds [Member] | Recurring [Member] | Significant Other Observable Inputs Level 2 [Member]
Fair value of assets and liabilities measured on a recurring basis:
Securities available for sale, at fair value		$ 93,766	$ 75,979
Mortgage Backed Securities [Member]
Fair value of assets and liabilities measured on a recurring basis:
Securities available for sale, at fair value		568,562	548,171
Mortgage Backed Securities [Member] | Recurring [Member]
Fair value of assets and liabilities measured on a recurring basis:
Securities available for sale, at fair value		$ 568,562	$ 548,171
Mortgage Backed Securities [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
Fair value of assets and liabilities measured on a recurring basis:
Securities available for sale, at fair value
Mortgage Backed Securities [Member] | Recurring [Member] | Significant Other Observable Inputs Level 2 [Member]
Fair value of assets and liabilities measured on a recurring basis:
Securities available for sale, at fair value		$ 568,562	$ 548,171
Other Securities [Member]
Fair value of assets and liabilities measured on a recurring basis:
Securities available for sale, at fair value		11,112	11,063
Other Securities [Member] | Recurring [Member]
Fair value of assets and liabilities measured on a recurring basis:
Securities available for sale, at fair value		$ 11,112	$ 11,063
Other Securities [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
Fair value of assets and liabilities measured on a recurring basis:
Securities available for sale, at fair value
Other Securities [Member] | Recurring [Member] | Significant Other Observable Inputs Level 2 [Member]
Fair value of assets and liabilities measured on a recurring basis:
Securities available for sale, at fair value		$ 11,112	$ 11,063
Interest Rate Lock Commitments [Member]
Fair value of assets and liabilities measured on a recurring basis:
Derivative assets		1,252	701
Interest Rate Lock Commitments [Member] | Significant Unobservable Inputs Level 3 [Member]
Fair value of assets and liabilities measured on a recurring basis:
Derivative assets		1,252	701
Interest Rate Lock Commitments [Member] | Recurring [Member]
Fair value of assets and liabilities measured on a recurring basis:
Derivative assets		$ 1,252	$ 701
Interest Rate Lock Commitments [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
Fair value of assets and liabilities measured on a recurring basis:
Derivative assets
Interest Rate Lock Commitments [Member] | Recurring [Member] | Significant Unobservable Inputs Level 3 [Member]
Fair value of assets and liabilities measured on a recurring basis:
Derivative assets		$ 1,252	$ 701

[1] Balances represent fair value of derivative financial instruments.