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Fair Value Measurements (Details 4)
Sep. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
item
Deposits    
Carrying amount of time deposits $ 2,396,480,000 $ 2,482,692,000
Other borrowed funds    
Number of long-term borrowing outstanding | item   1
Significant Unobservable Inputs (Level 3)    
Loans    
Carrying amount of fixed rate performing loans 1,379,521,000 $ 1,352,147,000
Estimated fair value of fixed rate performing loans 1,308,766,000 1,285,648,000
Deposits    
Carrying amount of time deposits 2,396,480,000 2,482,692,000
Estimated fair value of time deposits 2,395,133,000 2,480,390,000
Securities Sold Under Repurchase Agreements    
Carrying amount of long-term repurchase agreements 560,000,000 610,000,000
Estimated fair value of long-term repurchase agreements $ 518,148,000 558,097,100
Significant Other Observable Inputs (Level 2)    
Other borrowed funds    
Carrying amount of the long-term FHLB borrowings   6,244,000
Estimated fair value of long-term FHLB borrowings   $ 6,645,000