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Fair value measurements - Assets and liabilities measured on a recurring basis (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Fair value measurements on a recurring basis      
Available-for-sale investment securities $ 996,984,000 $ 820,648,000  
Estimated fair value      
Fair value measurements on a recurring basis      
Money market funds 45,030,000 10,000  
Available-for-sale investment securities 996,984,000 820,648,000  
Derivative assets      
Derivative assets 1,508,000 385,000  
Derivative liabilities      
Derivative liabilities 164,000 30,000  
Loans 4,950,241,000 4,749,525,000  
Level 1 | Estimated fair value      
Fair value measurements on a recurring basis      
Money market funds 0 0  
Available-for-sale investment securities 0 0  
Derivative assets      
Derivative assets 0 0  
Derivative liabilities      
Derivative liabilities 121,000 15,000  
Loans 0 0  
Level 2 | Estimated fair value      
Fair value measurements on a recurring basis      
Money market funds 45,030,000 10,000  
Available-for-sale investment securities 996,984,000 820,648,000  
Derivative assets      
Derivative assets 1,508,000 385,000  
Derivative liabilities      
Derivative liabilities 43,000 15,000  
Loans 26,784,000 4,639,000  
Level 3 | Estimated fair value      
Fair value measurements on a recurring basis      
Money market funds 0 0  
Available-for-sale investment securities 0 0  
Derivative assets      
Derivative assets 0 0  
Derivative liabilities      
Derivative liabilities 0 0  
Loans 4,923,457,000 4,744,886,000  
Fair value measurements on a recurring basis | Level 1      
Derivative assets      
Derivative assets 0 0  
Fair value measurements on a recurring basis | Level 1 | Interest rate lock commitments      
Derivative assets      
Derivative assets 0 0  
Fair value measurements on a recurring basis | Level 1 | Forward sale contracts      
Derivative assets      
Derivative assets 0 0  
Derivative liabilities      
Derivative liabilities 121,000 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 1 | Other      
Fair value measurements on a recurring basis      
Money market funds 0 0  
Fair value measurements on a recurring basis | Level 1 | Bank      
Fair value measurements on a recurring basis      
Available-for-sale investment securities 0 0  
Fair value measurements on a recurring basis | Level 1 | Mortgage-related securities - FNMA, FHLMC and GNMA | Bank      
Fair value measurements on a recurring basis      
Available-for-sale investment securities 0 0  
Fair value measurements on a recurring basis | Level 1 | U.S. Treasury federal agency obligations | Bank      
Fair value measurements on a recurring basis      
Available-for-sale investment securities 0 0  
Fair value measurements on a recurring basis | Level 2      
Derivative assets      
Derivative assets 1,508,000 385,000  
Fair value measurements on a recurring basis | Level 2 | Interest rate lock commitments      
Derivative assets      
Derivative assets 843,000 384,000  
Fair value measurements on a recurring basis | Level 2 | Forward sale contracts      
Derivative assets      
Derivative assets 1,000 1,000  
Derivative liabilities      
Derivative liabilities 43,000 15,000  
Fair value measurements on a recurring basis | Level 2 | Window forward contract      
Derivative assets      
Derivative assets 664,000 0  
Fair value measurements on a recurring basis | Level 2 | Other      
Fair value measurements on a recurring basis      
Money market funds 45,030,000 10,000  
Fair value measurements on a recurring basis | Level 2 | Bank      
Fair value measurements on a recurring basis      
Available-for-sale investment securities 996,984,000 820,648,000  
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 807,612,000 607,689,000  
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 189,372,000 212,959,000  
Fair value measurements on a recurring basis | Level 3      
Derivative assets      
Derivative assets 0 0  
Fair value measurements on a recurring basis | Level 3 | Interest rate lock commitments      
Derivative assets      
Derivative assets 0 0  
Fair value measurements on a recurring basis | Level 3 | Forward sale contracts      
Derivative assets      
Derivative assets 0 0  
Derivative liabilities      
Derivative liabilities 0 0  
Fair value measurements on a recurring basis | Level 3 | Window forward contract      
Derivative assets      
Derivative assets 0 0  
Fair value measurements on a recurring basis | Level 3 | Other      
Fair value measurements on a recurring basis      
Money market funds 0 0  
Fair value measurements on a recurring basis | Level 3 | Bank      
Fair value measurements on a recurring basis      
Available-for-sale investment securities 0 0  
Fair value measurements on a recurring basis | Level 3 | Mortgage-related securities - FNMA, FHLMC and GNMA | Bank      
Fair value measurements on a recurring basis      
Available-for-sale investment securities 0 0  
Fair value measurements on a recurring basis | Level 3 | U.S. Treasury federal agency obligations | Bank      
Fair value measurements on a recurring basis      
Available-for-sale investment securities 0 0  
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 1,382,000 178,000  
Real estate acquired in settlement of loans 219,000 1,030,000  
Fair value measurements on a nonrecurring basis | Level 1      
Derivative liabilities      
Loans 0 0  
Real estate acquired in settlement of loans 0 0  
Fair value measurements on a nonrecurring basis | Level 2      
Derivative liabilities      
Loans 0 0  
Real estate acquired in settlement of loans 0 0  
Fair value measurements on a nonrecurring basis | Level 3      
Derivative liabilities      
Loans 1,382,000 178,000  
Real estate acquired in settlement of loans $ 219,000 $ 1,030,000