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 $)
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
ASSETS      
Cash and cash equivalents $ 142,250,000 $ 73,023,000  
Securities available for sale, at fair value 1,078,699,000 677,348,000 583,217,000
Restricted stock 42,441,000 26,036,000  
Loans held for sale 48,215,000 53,185,000  
Net loans 5,294,475,000 3,035,504,000  
Asset, interest rate swap - loans 16,000 33,000  
Accrued interest receivable 22,140,000 15,000,000  
LIABILITIES      
Deposits 5,690,618,000 3,238,777,000  
Borrowings, Fair Value Disclosure 550,111,000 443,237,000  
Accrued interest payable 2,136,000 902,000  
Liability, interest rate swap - loans 16,000 33,000  
Carrying Value [Member]
     
ASSETS      
Cash and cash equivalents 142,250,000 73,023,000  
Securities available for sale, at fair value 1,078,699,000 677,348,000  
Restricted stock 42,441,000 26,036,000  
Loans held for sale 48,215,000 53,185,000  
Net loans 5,243,291,000 3,009,233,000  
Asset, interest rate swap - loans 16,000 33,000  
Accrued interest receivable 22,140,000 15,000,000  
LIABILITIES      
Deposits 5,686,131,000 3,236,843,000  
Borrowings, Fair Value Disclosure 572,698,000 463,314,000  
Accrued interest payable 2,136,000 902,000  
Liability, interest rate swap - loans 16,000 33,000  
Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
     
ASSETS      
Cash and cash equivalents 142,250,000 73,023,000  
Securities available for sale, at fair value       
Restricted stock       
Loans held for sale       
Net loans       
Asset, interest rate swap - loans       
Accrued interest receivable       
LIABILITIES      
Deposits       
Borrowings, Fair Value Disclosure       
Accrued interest payable       
Liability, interest rate swap - loans       
Significant Other Observable Inputs Level 2 [Member]
     
ASSETS      
Cash and cash equivalents       
Securities available for sale, at fair value 1,078,699,000 677,348,000  
Restricted stock 42,441,000 26,036,000  
Loans held for sale 48,215,000 53,185,000  
Net loans       
Asset, interest rate swap - loans 16,000 33,000  
Accrued interest receivable 22,140,000 15,000,000  
LIABILITIES      
Deposits 5,690,618,000 3,238,777,000  
Borrowings, Fair Value Disclosure 550,111,000 443,237,000  
Accrued interest payable 2,136,000 902,000  
Liability, interest rate swap - loans 16,000 33,000  
Significant Unobservable Inputs Level 3 [Member]
     
ASSETS      
Cash and cash equivalents       
Securities available for sale, at fair value       
Restricted stock       
Loans held for sale       
Net loans 5,294,475,000 3,035,504,000  
Asset, interest rate swap - loans       
Accrued interest receivable       
LIABILITIES      
Deposits       
Borrowings, Fair Value Disclosure       
Accrued interest payable       
Liability, interest rate swap - loans       
Trust Swaps [Member]
     
LIABILITIES      
Cash flow hedge 3,784,000 3,046,000  
Trust Swaps [Member] | Carrying Value [Member]
     
LIABILITIES      
Cash flow hedge 3,784,000 3,046,000  
Trust Swaps [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
     
LIABILITIES      
Cash flow hedge       
Trust Swaps [Member] | Significant Other Observable Inputs Level 2 [Member]
     
LIABILITIES      
Cash flow hedge 3,784,000 3,046,000  
Trust Swaps [Member] | Significant Unobservable Inputs Level 3 [Member]
     
LIABILITIES      
Cash flow hedge       
Prime Loan Swaps [Member]
     
ASSETS      
Derivative assets 13,000    
LIABILITIES      
Cash flow hedge   516,000  
Prime Loan Swaps [Member] | Carrying Value [Member]
     
ASSETS      
Derivative assets 13,000    
LIABILITIES      
Cash flow hedge   516,000  
Prime Loan Swaps [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
     
ASSETS      
Derivative assets       
Prime Loan Swaps [Member] | Significant Other Observable Inputs Level 2 [Member]
     
ASSETS      
Derivative assets 13,000    
LIABILITIES      
Cash flow hedge   516,000  
Prime Loan Swaps [Member] | Significant Unobservable Inputs Level 3 [Member]
     
ASSETS      
Derivative assets       
Mortgage Rate Lock Commitments [Member]
     
ASSETS      
Derivative assets 538,000    
Mortgage Rate Lock Commitments [Member] | Carrying Value [Member]
     
ASSETS      
Derivative assets 538,000    
Mortgage Rate Lock Commitments [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
     
ASSETS      
Derivative assets       
Mortgage Rate Lock Commitments [Member] | Significant Other Observable Inputs Level 2 [Member]
     
ASSETS      
Derivative assets       
Mortgage Rate Lock Commitments [Member] | Significant Unobservable Inputs Level 3 [Member]
     
ASSETS      
Derivative assets $ 538,000