FAIR VALUE MEASUREMENTS (Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
ASSETS:
Interest rate swap	$ 5,470	$ 2,681
Cash flow hedges	1,553	580
Estimated Fair Value	888,692	1,102,114
LIABILITIES:
Interest rate swap	5,470	2,681
Cash flow hedges	$ 11,911	8,433
Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
ASSETS:
Interest rate swap
Cash flow hedges
Estimated Fair Value
LIABILITIES:
Interest rate swap
Cash flow hedges
Significant Other Observable Inputs Level 2 [Member]
ASSETS:
Interest rate swap	$ 5,470	2,681
Cash flow hedges	1,553	580
Estimated Fair Value	888,692	1,102,114
LIABILITIES:
Interest rate swap	5,470	2,681
Cash flow hedges	$ 11,911	8,433
Significant Unobservable Inputs Level 3 [Member]
ASSETS:
Interest rate swap
Cash flow hedges
Estimated Fair Value
LIABILITIES:
Interest rate swap
Cash flow hedges
Recurring [Member]
ASSETS:
Interest rate swap	$ 5,470	2,681
Cash flow hedges	1,553	580
LIABILITIES:
Interest rate swap	5,470	2,681
Cash flow hedges	$ 11,911	$ 8,433
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
ASSETS:
Interest rate swap
Cash flow hedges
LIABILITIES:
Interest rate swap
Cash flow hedges
Recurring [Member] | Significant Other Observable Inputs Level 2 [Member]
ASSETS:
Interest rate swap	$ 5,470	$ 2,681
Cash flow hedges	1,553	580
LIABILITIES:
Interest rate swap	5,470	2,681
Cash flow hedges	$ 11,911	$ 8,433
Recurring [Member] | Significant Unobservable Inputs Level 3 [Member]
ASSETS:
Interest rate swap
Cash flow hedges
LIABILITIES:
Interest rate swap
Cash flow hedges
US Government Agencies Debt Securities [Member]
ASSETS:
Estimated Fair Value	$ 8,411	$ 8,454
US Government Agencies Debt Securities [Member] | Recurring [Member]
ASSETS:
Estimated Fair Value	$ 8,411	$ 8,454
US Government Agencies Debt Securities [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
ASSETS:
Estimated Fair Value
US Government Agencies Debt Securities [Member] | Recurring [Member] | Significant Other Observable Inputs Level 2 [Member]
ASSETS:
Estimated Fair Value	$ 8,411	$ 8,454
US Government Agencies Debt Securities [Member] | Recurring [Member] | Significant Unobservable Inputs Level 3 [Member]
ASSETS:
Estimated Fair Value
Obligations of States and Political Subdivisions [Member]
ASSETS:
Estimated Fair Value	$ 249,893	$ 445,647
Obligations of States and Political Subdivisions [Member] | Recurring [Member]
ASSETS:
Estimated Fair Value	$ 249,893	$ 445,647
Obligations of States and Political Subdivisions [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
ASSETS:
Estimated Fair Value
Obligations of States and Political Subdivisions [Member] | Recurring [Member] | Significant Other Observable Inputs Level 2 [Member]
ASSETS:
Estimated Fair Value	$ 249,893	$ 445,647
Obligations of States and Political Subdivisions [Member] | Recurring [Member] | Significant Unobservable Inputs Level 3 [Member]
ASSETS:
Estimated Fair Value
Corporate and Other Securities [Member]
ASSETS:
Estimated Fair Value	$ 72,462	$ 78,680
Corporate and Other Securities [Member] | Recurring [Member]
ASSETS:
Estimated Fair Value	$ 72,462	$ 78,680
Corporate and Other Securities [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
ASSETS:
Estimated Fair Value
Corporate and Other Securities [Member] | Recurring [Member] | Significant Other Observable Inputs Level 2 [Member]
ASSETS:
Estimated Fair Value	$ 72,462	$ 78,680
Corporate and Other Securities [Member] | Recurring [Member] | Significant Unobservable Inputs Level 3 [Member]
ASSETS:
Estimated Fair Value
Mortgage Backed Securities [Member]
ASSETS:
Estimated Fair Value	$ 547,717	$ 559,329
Mortgage Backed Securities [Member] | Recurring [Member]
ASSETS:
Estimated Fair Value	$ 547,717	$ 559,329
Mortgage Backed Securities [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
ASSETS:
Estimated Fair Value
Mortgage Backed Securities [Member] | Recurring [Member] | Significant Other Observable Inputs Level 2 [Member]
ASSETS:
Estimated Fair Value	$ 547,717	$ 559,329
Mortgage Backed Securities [Member] | Recurring [Member] | Significant Unobservable Inputs Level 3 [Member]
ASSETS:
Estimated Fair Value
Other Securities [Member]
ASSETS:
Estimated Fair Value	$ 10,209	$ 10,004
Other Securities [Member] | Recurring [Member]
ASSETS:
Estimated Fair Value	$ 10,209	$ 10,004
Other Securities [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
ASSETS:
Estimated Fair Value
Other Securities [Member] | Recurring [Member] | Significant Other Observable Inputs Level 2 [Member]
ASSETS:
Estimated Fair Value	$ 10,209	$ 10,004
Other Securities [Member] | Recurring [Member] | Significant Unobservable Inputs Level 3 [Member]
ASSETS:
Estimated Fair Value
Best Effort Forward Delivery Commitments [Member]
LIABILITIES:
Liabilities	$ 544
Best Effort Forward Delivery Commitments [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
LIABILITIES:
Liabilities
Best Effort Forward Delivery Commitments [Member] | Significant Other Observable Inputs Level 2 [Member]
LIABILITIES:
Liabilities
Best Effort Forward Delivery Commitments [Member] | Significant Unobservable Inputs Level 3 [Member]
LIABILITIES:
Liabilities	$ 544
Best Effort Forward Delivery Commitments [Member] | Recurring [Member]
LIABILITIES:
Liabilities	$ 544
Best Effort Forward Delivery Commitments [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
LIABILITIES:
Liabilities
Best Effort Forward Delivery Commitments [Member] | Recurring [Member] | Significant Unobservable Inputs Level 3 [Member]
LIABILITIES:
Liabilities	$ 544
Interest Rate Lock Commitments [Member]
ASSETS:
Derivative assets	$ 1,321	$ 513
Interest Rate Lock Commitments [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
ASSETS:
Derivative assets
Interest Rate Lock Commitments [Member] | Significant Other Observable Inputs Level 2 [Member]
ASSETS:
Derivative assets
Interest Rate Lock Commitments [Member] | Significant Unobservable Inputs Level 3 [Member]
ASSETS:
Derivative assets	$ 1,321	513
Interest Rate Lock Commitments [Member] | Recurring [Member]
ASSETS:
Derivative assets	$ 1,321	$ 513
Interest Rate Lock Commitments [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
ASSETS:
Derivative assets
Interest Rate Lock Commitments [Member] | Recurring [Member] | Significant Unobservable Inputs Level 3 [Member]
ASSETS:
Derivative assets	$ 1,321	$ 513