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Fair value measurements - Assets and liabilities measured on a recurring basis (Details) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Fair value measurements on a recurring basis      
Available-for-sale investment securities $ 894,021,000 $ 820,648,000  
Estimated fair value      
Fair value measurements on a recurring basis      
Money market funds 10,000 10,000  
Available-for-sale investment securities 894,021,000 820,648,000  
Derivative assets      
Derivative assets 1,219,000 385,000  
Derivative liabilities      
Derivative liabilities 270,000 30,000  
Loans 4,940,177,000 4,749,525,000  
Level 1 | Interest rate lock commitments      
Derivative liabilities      
Derivative liabilities 0 0  
Level 1 | Estimated fair value      
Derivative assets      
Derivative assets 0 0  
Derivative liabilities      
Derivative liabilities 211,000 15,000  
Level 2 | Estimated fair value      
Fair value measurements on a recurring basis      
Money market funds 10,000 10,000  
Available-for-sale investment securities 894,021,000 820,648,000  
Derivative assets      
Derivative assets 1,219,000 385,000  
Derivative liabilities      
Derivative liabilities 59,000 15,000  
Loans 6,242,000 4,639,000  
Level 3 | Estimated fair value      
Derivative liabilities      
Loans 4,933,935,000 4,744,886,000  
Fair value measurements on a recurring basis | Level 1      
Derivative assets      
Derivative assets 0 0  
Derivative liabilities      
Derivative liabilities 211,000 15,000  
Fair value measurements on a recurring basis | Level 1 | Forward sale contracts      
Derivative assets      
Derivative assets 0 0  
Derivative liabilities      
Derivative liabilities 211,000 15,000  
Fair value measurements on a recurring basis | Level 1 | Window forward contract      
Derivative assets      
Derivative assets 0 0  
Fair value measurements on a recurring basis | Level 2      
Derivative assets      
Derivative assets 1,219,000 385,000  
Derivative liabilities      
Derivative liabilities 59,000 15,000  
Fair value measurements on a recurring basis | Level 2 | Interest rate lock commitments      
Derivative assets      
Derivative assets 795,000 384,000  
Derivative liabilities      
Derivative liabilities 0 0  
Fair value measurements on a recurring basis | Level 2 | Forward sale contracts      
Derivative assets      
Derivative assets 4,000 1,000  
Derivative liabilities      
Derivative liabilities 59,000 15,000  
Fair value measurements on a recurring basis | Level 2 | Window forward contract      
Derivative assets      
Derivative assets 420,000 0  
Fair value measurements on a recurring basis | Level 2 | Other      
Fair value measurements on a recurring basis      
Money market funds 10,000 10,000  
Fair value measurements on a recurring basis | Level 2 | Bank      
Fair value measurements on a recurring basis      
Available-for-sale investment securities 894,021,000 820,648,000  
Fair value measurements on a recurring basis | Level 2 | Mortgage-related securities - FNMA, FHLMC and GNMA | Bank      
Fair value measurements on a recurring basis      
Available-for-sale investment securities 695,862,000 607,689,000  
Fair value measurements on a recurring basis | Level 2 | U.S. Treasury federal agency obligations | Bank      
Fair value measurements on a recurring basis      
Available-for-sale investment securities 198,159,000 212,959,000  
Fair value measurements on a nonrecurring basis | American Savings Bank (ASB)      
Derivative liabilities      
Adjustments to fair value of loans held for sale 0   $ 0
Fair value measurements on a nonrecurring basis | Estimated fair value      
Derivative liabilities      
Loans 313,000 178,000  
Real estate acquired in settlement of loans 446,000 1,030,000  
Fair value measurements on a nonrecurring basis | Level 3      
Derivative liabilities      
Loans 313,000 178,000  
Real estate acquired in settlement of loans $ 446,000 $ 1,030,000