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FAIR VALUE MEASUREMENTS (Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
ASSETS:
Interest rate swap	$ 4,684	$ 2,681
Cash flow hedges	1,185	580
Available for sale securities, estimated fair value	1,089,664us-gaap_AvailableForSaleSecurities	1,102,114us-gaap_AvailableForSaleSecurities
LIABILITIES:
Interest rate swap	4,684	2,681
Cash flow hedges	10,854	8,433
Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
ASSETS:
Interest rate swap
Cash flow hedges
Available for sale securities, estimated fair value
LIABILITIES:
Interest rate swap
Cash flow hedges
Significant Other Observable Inputs Level 2 [Member]
ASSETS:
Interest rate swap	4,684	2,681
Cash flow hedges	1,185	580
Available for sale securities, estimated fair value	1,089,664	1,102,114
LIABILITIES:
Interest rate swap	4,684	2,681
Cash flow hedges	10,854	8,433
Significant Unobservable Inputs Level 3 [Member]
ASSETS:
Interest rate swap
Cash flow hedges
Available for sale securities, estimated fair value
LIABILITIES:
Interest rate swap
Cash flow hedges
Recurring [Member]
ASSETS:
Interest rate swap	4,684	2,681
Cash flow hedges	1,185	580
LIABILITIES:
Interest rate swap	4,684	2,681
Cash flow hedges	10,854	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	4,684	2,681
Cash flow hedges	1,185	580
LIABILITIES:
Interest rate swap	4,684	2,681
Cash flow hedges	10,854	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:
Available for sale securities, estimated fair value	8,595	8,454
US Government Agencies Debt Securities [Member] \| Recurring [Member]
ASSETS:
Available for sale securities, estimated fair value	8,595	8,454
US Government Agencies Debt Securities [Member] \| Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
ASSETS:
Available for sale securities, estimated fair value
US Government Agencies Debt Securities [Member] \| Recurring [Member] \| Significant Other Observable Inputs Level 2 [Member]
ASSETS:
Available for sale securities, estimated fair value	8,595	8,454
US Government Agencies Debt Securities [Member] \| Recurring [Member] \| Significant Unobservable Inputs Level 3 [Member]
ASSETS:
Available for sale securities, estimated fair value
Obligations of States and Political Subdivisions [Member]
ASSETS:
Available for sale securities, estimated fair value	452,438	445,647
Obligations of States and Political Subdivisions [Member] \| Recurring [Member]
ASSETS:
Available for sale securities, estimated fair value	452,438	445,647
Obligations of States and Political Subdivisions [Member] \| Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
ASSETS:
Available for sale securities, estimated fair value
Obligations of States and Political Subdivisions [Member] \| Recurring [Member] \| Significant Other Observable Inputs Level 2 [Member]
ASSETS:
Available for sale securities, estimated fair value	452,438	445,647
Obligations of States and Political Subdivisions [Member] \| Recurring [Member] \| Significant Unobservable Inputs Level 3 [Member]
ASSETS:
Available for sale securities, estimated fair value
Corporate and Other Securities [Member]
ASSETS:
Available for sale securities, estimated fair value	78,141	78,680
Corporate and Other Securities [Member] \| Recurring [Member]
ASSETS:
Available for sale securities, estimated fair value	78,141	78,680
Corporate and Other Securities [Member] \| Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
ASSETS:
Available for sale securities, estimated fair value
Corporate and Other Securities [Member] \| Recurring [Member] \| Significant Other Observable Inputs Level 2 [Member]
ASSETS:
Available for sale securities, estimated fair value	78,141	78,680
Corporate and Other Securities [Member] \| Recurring [Member] \| Significant Unobservable Inputs Level 3 [Member]
ASSETS:
Available for sale securities, estimated fair value
Mortgage Backed Securities [Member]
ASSETS:
Available for sale securities, estimated fair value	540,463	559,329
Mortgage Backed Securities [Member] \| Recurring [Member]
ASSETS:
Available for sale securities, estimated fair value	540,463	559,329
Mortgage Backed Securities [Member] \| Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
ASSETS:
Available for sale securities, estimated fair value
Mortgage Backed Securities [Member] \| Recurring [Member] \| Significant Other Observable Inputs Level 2 [Member]
ASSETS:
Available for sale securities, estimated fair value	540,463	559,329
Mortgage Backed Securities [Member] \| Recurring [Member] \| Significant Unobservable Inputs Level 3 [Member]
ASSETS:
Available for sale securities, estimated fair value
Other Securities [Member]
ASSETS:
Available for sale securities, estimated fair value	10,027	10,004
Other Securities [Member] \| Recurring [Member]
ASSETS:
Available for sale securities, estimated fair value	10,027	10,004
Other Securities [Member] \| Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
ASSETS:
Available for sale securities, estimated fair value
Other Securities [Member] \| Recurring [Member] \| Significant Other Observable Inputs Level 2 [Member]
ASSETS:
Available for sale securities, estimated fair value	10,027	10,004
Other Securities [Member] \| Recurring [Member] \| Significant Unobservable Inputs Level 3 [Member]
ASSETS:
Available for sale securities, estimated fair value
Best Effort Forward Delivery Commitments [Member]
LIABILITIES:
Liabilities	367
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	367
Best Effort Forward Delivery Commitments [Member] \| Recurring [Member]
LIABILITIES:
Liabilities	367
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	367
Interest Rate Lock Commitments [Member]
ASSETS:
Derivative assets	1,271	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	1,271	513
Interest Rate Lock Commitments [Member] \| Recurring [Member]
ASSETS:
Derivative assets	1,271	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	$ 1,271	$ 513