Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS (Carrying Values and Estimated Fair Values of the Company's Financial Instruments) (Details)

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FAIR VALUE MEASUREMENTS (Carrying Values and Estimated Fair Values of the Company's Financial Instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
ASSETS    
Cash and cash equivalents $ 179,194 $ 133,260
Securities available for sale, at fair value 888,692 1,102,114
Held to maturity securities 200,319  
Restricted stock 52,721 54,854
Loans held for sale 65,713 42,519
Net loans 5,536,118 5,340,759
Interest rate swap 5,470 2,681
Cash flow hedges 1,553 580
Accrued interest receivable 21,488 21,775
Bank owned life insurance 142,433 139,005
LIABILITIES    
Deposits 5,817,840 5,637,929
Borrowings 699,804 666,224
Accrued interest payable 1,610 1,899
Interest rate swap 5,470 2,681
Cash flow hedges 11,911 8,433
Carrying Value [Member]    
ASSETS    
Cash and cash equivalents 179,194 133,260
Securities available for sale, at fair value 888,692 1,102,114
Held to maturity securities 199,363  
Restricted stock 52,721 54,854
Loans held for sale 65,713 42,519
Net loans 5,510,352 5,313,612
Interest rate swap 5,470 2,681
Cash flow hedges 1,553 580
Accrued interest receivable 21,488 21,775
Bank owned life insurance 142,433 139,005
LIABILITIES    
Deposits 5,818,853 5,638,770
Borrowings 722,149 686,935
Accrued interest payable 1,610 1,899
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    
Cash and cash equivalents $ 179,194 133,260
Securities available for sale, at fair value  
Held to maturity securities  
Restricted stock  
Loans held for sale  
Net loans  
Interest rate swap  
Cash flow hedges  
Accrued interest receivable  
Bank owned life insurance  
LIABILITIES    
Deposits  
Borrowings  
Accrued interest payable  
Interest rate swap  
Cash flow hedges  
Significant Other Observable Inputs Level 2 [Member]    
ASSETS    
Cash and cash equivalents  
Securities available for sale, at fair value $ 888,692 1,102,114
Held to maturity securities 200,319  
Restricted stock 52,721 54,854
Loans held for sale $ 65,713 42,519
Net loans  
Interest rate swap $ 5,470 2,681
Cash flow hedges 1,553 580
Accrued interest receivable 21,488 21,775
Bank owned life insurance 142,433 139,005
LIABILITIES    
Deposits 5,817,840 5,637,929
Borrowings 699,804 666,224
Accrued interest payable 1,610 1,899
Interest rate swap 5,470 2,681
Cash flow hedges $ 11,911 8,433
Significant Unobservable Inputs Level 3 [Member]    
ASSETS    
Cash and cash equivalents  
Securities available for sale, at fair value  
Held to maturity securities  
Restricted stock  
Loans held for sale  
Net loans $ 5,536,118 5,340,759
Interest rate swap  
Cash flow hedges  
Accrued interest receivable  
Bank owned life insurance  
LIABILITIES    
Deposits  
Borrowings  
Accrued interest payable  
Interest rate swap  
Cash flow hedges  
Interest Rate Lock Commitments [Member]    
ASSETS    
Derivative assets $ 1,321 513
Interest Rate Lock Commitments [Member] | Carrying Value [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
Best Effort Forward Delivery Commitments [Member]    
LIABILITIES    
Liabilities 544  
Best Effort Forward Delivery Commitments [Member] | Carrying Value [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