FAIR VALUE MEASUREMENTS (Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair value of assets and liabilities measured on a recurring basis:
Interest rate swap, assets	$ 2,681	$ 33
Cash flow hedges	580
Available for sale securities, Estimated fair value	1,102,114us-gaap_AvailableForSaleSecurities	677,348us-gaap_AvailableForSaleSecurities
Interest rate swap, liabilities	2,681	33
Cash flow hedges, liabilities	8,433	3,562
Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
Fair value of assets and liabilities measured on a recurring basis:
Interest rate swap, assets
Cash flow hedges
Available for sale securities, Estimated fair value
Interest rate swap, liabilities
Cash flow hedges, liabilities
Significant Other Observable Inputs Level 2 [Member]
Fair value of assets and liabilities measured on a recurring basis:
Interest rate swap, assets	2,681	33
Cash flow hedges	580
Available for sale securities, Estimated fair value	1,102,114	677,348
Interest rate swap, liabilities	2,681	33
Cash flow hedges, liabilities	8,433	3,562
Significant Unobservable Inputs Level 3 [Member]
Fair value of assets and liabilities measured on a recurring basis:
Interest rate swap, assets
Cash flow hedges
Available for sale securities, Estimated fair value
Interest rate swap, liabilities
Cash flow hedges, liabilities
Recurring [Member]
Fair value of assets and liabilities measured on a recurring basis:
Interest rate swap, assets	2,681	33
Cash flow hedges	580
Interest rate swap, liabilities	2,681	33
Cash flow hedges, liabilities	8,433	3,562
Recurring [Member] \| Significant Other Observable Inputs Level 2 [Member]
Fair value of assets and liabilities measured on a recurring basis:
Interest rate swap, assets	2,681	33
Cash flow hedges	580
Interest rate swap, liabilities	2,681	33
Cash flow hedges, liabilities	8,433	3,562
US Government Agencies Debt Securities [Member]
Fair value of assets and liabilities measured on a recurring basis:
Available for sale securities, Estimated fair value	8,454	2,153
US Government Agencies Debt Securities [Member] \| Recurring [Member]
Fair value of assets and liabilities measured on a recurring basis:
Available for sale securities, Estimated fair value	8,454	2,153
US Government Agencies Debt Securities [Member] \| Recurring [Member] \| Significant Other Observable Inputs Level 2 [Member]
Fair value of assets and liabilities measured on a recurring basis:
Available for sale securities, Estimated fair value	8,454	2,153
Obligations of States and Political Subdivisions [Member]
Fair value of assets and liabilities measured on a recurring basis:
Available for sale securities, Estimated fair value	445,647	254,830
Obligations of States and Political Subdivisions [Member] \| Recurring [Member]
Fair value of assets and liabilities measured on a recurring basis:
Available for sale securities, Estimated fair value	445,647	254,830
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:
Available for sale securities, Estimated fair value	445,647	254,830
Corporate and Other Bonds [Member]
Fair value of assets and liabilities measured on a recurring basis:
Available for sale securities, Estimated fair value	78,680	9,434
Corporate and Other Bonds [Member] \| Recurring [Member]
Fair value of assets and liabilities measured on a recurring basis:
Available for sale securities, Estimated fair value	78,680	9,434
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:
Available for sale securities, Estimated fair value	78,680	9,434
Mortgage Backed Securities [Member]
Fair value of assets and liabilities measured on a recurring basis:
Available for sale securities, Estimated fair value	559,329	407,362
Mortgage Backed Securities [Member] \| Recurring [Member]
Fair value of assets and liabilities measured on a recurring basis:
Available for sale securities, Estimated fair value	559,329	407,362
Mortgage Backed Securities [Member] \| Recurring [Member] \| Significant Other Observable Inputs Level 2 [Member]
Fair value of assets and liabilities measured on a recurring basis:
Available for sale securities, Estimated fair value	559,329	407,362
Other Securities [Member]
Fair value of assets and liabilities measured on a recurring basis:
Available for sale securities, Estimated fair value	10,004	3,569
Other Securities [Member] \| Recurring [Member]
Fair value of assets and liabilities measured on a recurring basis:
Available for sale securities, Estimated fair value	10,004	3,569
Other Securities [Member] \| Recurring [Member] \| Significant Other Observable Inputs Level 2 [Member]
Fair value of assets and liabilities measured on a recurring basis:
Available for sale securities, Estimated fair value	10,004	3,569
Interest Rate Lock Commitments [Member]
Fair value of assets and liabilities measured on a recurring basis:
Interest rate lock commitments	513
Interest Rate Lock Commitments [Member] \| Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
Fair value of assets and liabilities measured on a recurring basis:
Interest rate lock commitments
Interest Rate Lock Commitments [Member] \| Significant Other Observable Inputs Level 2 [Member]
Fair value of assets and liabilities measured on a recurring basis:
Interest rate lock commitments
Interest Rate Lock Commitments [Member] \| Significant Unobservable Inputs Level 3 [Member]
Fair value of assets and liabilities measured on a recurring basis:
Interest rate lock commitments	513
Interest Rate Lock Commitments [Member] \| Recurring [Member]
Fair value of assets and liabilities measured on a recurring basis:
Interest rate lock commitments	513
Interest Rate Lock Commitments [Member] \| Recurring [Member] \| Significant Unobservable Inputs Level 3 [Member]
Fair value of assets and liabilities measured on a recurring basis:
Interest rate lock commitments	$ 513

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.

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