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Fair value measurements (Details 3) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Mortgage-related securities - FNMA, FHLMC and GNMA
Dec. 31, 2013
Mortgage-related securities - FNMA, FHLMC and GNMA
Sep. 30, 2014
Federal agency obligations
Dec. 31, 2013
Federal agency obligations
Sep. 30, 2014
Municipal bonds
Dec. 31, 2013
Municipal bonds
Sep. 30, 2014
Level 1
Forward sale contracts
Dec. 31, 2013
Level 1
Forward sale contracts
Sep. 30, 2014
Fair value measurements on a recurring basis
Level 2
Dec. 31, 2013
Fair value measurements on a recurring basis
Level 2
Sep. 30, 2014
Fair value measurements on a recurring basis
Level 2
Interest rate lock commitments
Dec. 31, 2013
Fair value measurements on a recurring basis
Level 2
Interest rate lock commitments
Sep. 30, 2014
Fair value measurements on a recurring basis
Level 2
Forward sale contracts
Dec. 31, 2013
Fair value measurements on a recurring basis
Level 2
Forward sale contracts
Sep. 30, 2014
Fair value measurements on a recurring basis
Level 2
Bank
Dec. 31, 2013
Fair value measurements on a recurring basis
Level 2
Bank
Sep. 30, 2014
Fair value measurements on a recurring basis
Level 2
Other
Dec. 31, 2013
Fair value measurements on a recurring basis
Level 2
Other
Sep. 30, 2014
Fair value measurements on a recurring basis
Level 2
Mortgage-related securities - FNMA, FHLMC and GNMA
Bank
Dec. 31, 2013
Fair value measurements on a recurring basis
Level 2
Mortgage-related securities - FNMA, FHLMC and GNMA
Bank
Sep. 30, 2014
Fair value measurements on a recurring basis
Level 2
Federal agency obligations
Bank
Dec. 31, 2013
Fair value measurements on a recurring basis
Level 2
Federal agency obligations
Bank
Sep. 30, 2014
Fair value measurements on a recurring basis
Level 2
Municipal bonds
Bank
Dec. 31, 2013
Fair value measurements on a recurring basis
Level 2
Municipal bonds
Bank
Sep. 30, 2014
Fair value measurements on a recurring basis
Level 1
Dec. 31, 2013
Fair value measurements on a recurring basis
Level 1
Sep. 30, 2014
Fair value measurements on a recurring basis
Level 1
Forward sale contracts
Dec. 31, 2013
Fair value measurements on a recurring basis
Level 1
Forward sale contracts
Sep. 30, 2014
Fair value measurements on a nonrecurring basis
American Savings Bank (ASB)
Sep. 30, 2013
Fair value measurements on a nonrecurring basis
American Savings Bank (ASB)
Sep. 30, 2014
Fair value measurements on a nonrecurring basis
Estimated fair value
Dec. 31, 2013
Fair value measurements on a nonrecurring basis
Estimated fair value
Sep. 30, 2014
Fair value measurements on a nonrecurring basis
Level 3
Dec. 31, 2013
Fair value measurements on a nonrecurring basis
Level 3
Fair value measurements on a recurring and nonrecurring basis                                                                        
Money market funds                                     $ 10,000 $ 10,000                                
Available-for-sale securities 531,603,000 529,007,000 425,307,000 369,444,000 106,296,000 80,973,000 0 78,590,000                 531,603,000 529,007,000     425,307,000 369,444,000 106,296,000 80,973,000 0 78,590,000                    
Derivative assets                                                                        
Derivative assets                     217,000 531,000 216,000 488,000 1,000 43,000                     0 98,000 0 98,000            
Derivative liabilities                                                                        
Derivative liabilities                 0 0 4,000 26,000 1,000 24,000 3,000 2,000                     23,000   23,000 0            
Loans                                                                 2,000,000 4,000,000 2,000,000 4,000,000
Real estate acquired in settlement of loans                                                                 1,000,000 0 1,000,000 0
Adjustments to fair value of loans held for sale                                                             $ 0 $ 0