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FAIR VALUES OF FINANCIAL INSTRUMENTS: (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair value measurement    
Securities available-for-sale $ 914,560 $ 691,000
U.S. Government entity mortgage-backed securities
   
Fair value measurement    
Securities available-for-sale 1,633 1,886
Mortgage-backed securities, residential
   
Fair value measurement    
Securities available-for-sale 197,764 244,676
Mortgage-backed securities, commercial
   
Fair value measurement    
Securities available-for-sale 4,391 5,131
Collateralized mortgage obligations
   
Fair value measurement    
Securities available-for-sale 506,741 233,320
State and municipal obligations
   
Fair value measurement    
Securities available-for-sale 194,987 199,485
Collateralized debt obligations
   
Fair value measurement    
Securities available-for-sale 9,044 6,122
Equity Securities
   
Fair value measurement    
Securities available-for-sale 0 380
Level 1
   
Fair value measurement    
Securities available-for-sale 0 380
Level 1 | Equity Securities
   
Fair value measurement    
Securities available-for-sale 0 380
Level 2
   
Fair value measurement    
Securities available-for-sale 900,991 674,587
Derivative Assets 1,195 2,053
Derivative Liabilities (1,195) (2,053)
Level 2 | U.S. Government entity mortgage-backed securities
   
Fair value measurement    
Securities available-for-sale 1,633 1,886
Level 2 | Mortgage-backed securities, residential
   
Fair value measurement    
Securities available-for-sale 197,764 244,676
Level 2 | Mortgage-backed securities, commercial
   
Fair value measurement    
Securities available-for-sale 4,391 5,131
Level 2 | Collateralized mortgage obligations
   
Fair value measurement    
Securities available-for-sale 506,741 233,320
Level 2 | State and municipal obligations
   
Fair value measurement    
Securities available-for-sale 190,462 189,574
Level 3
   
Fair value measurement    
Securities available-for-sale 13,569 16,033
Level 3 | State and municipal obligations
   
Fair value measurement    
Securities available-for-sale 4,525 9,911
Level 3 | Collateralized debt obligations
   
Fair value measurement    
Securities available-for-sale $ 9,044 $ 6,122