Fair value measurements (Details 3) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Mortgage-related securities - FNMA, FHLMC and GNMA	Dec. 31, 2013 Mortgage-related securities - FNMA, FHLMC and GNMA	Jun. 30, 2014 Federal agency obligations	Dec. 31, 2013 Federal agency obligations	Jun. 30, 2014 Municipal bonds	Dec. 31, 2013 Municipal bonds	Jun. 30, 2014 Fair value measurements on a recurring basis Level 2	Dec. 31, 2013 Fair value measurements on a recurring basis Level 2	Jun. 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	Jun. 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	Jun. 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	Jun. 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	Jun. 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	Jun. 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	Jun. 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	Jun. 30, 2014 Fair value measurements on a recurring basis Level 1	Dec. 31, 2013 Fair value measurements on a recurring basis Level 1	Jun. 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	Jun. 30, 2014 Fair value measurements on a nonrecurring basis American Savings Bank (ASB)	Jun. 30, 2013 Fair value measurements on a nonrecurring basis American Savings Bank (ASB)	Jun. 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	Jun. 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	549,321,000	529,007,000	447,292,000	369,444,000	102,029,000	80,973,000	0	78,590,000							549,321,000	529,007,000			447,292,000	369,444,000	102,029,000	80,973,000	0	78,590,000
Derivative assets
Derivative assets									0	531,000	0	488,000	0	43,000											0	98,000	0	98,000
Derivative liabilities
Derivative liabilities									0	26,000	0	24,000	0	2,000													0	0
Loans																															3,000,000	4,000,000	3,000,000	4,000,000
Adjustments to fair value of loans held for sale																													$ 0	$ 0