Fair value measurements (Details 3) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Mortgage-related securities - FNMA, FHLMC and GNMA	Dec. 31, 2013 Mortgage-related securities - FNMA, FHLMC and GNMA	Mar. 31, 2014 Federal agency obligations	Dec. 31, 2013 Federal agency obligations	Mar. 31, 2014 Municipal bonds	Dec. 31, 2013 Municipal bonds	Mar. 31, 2014 Fair value measurements on a recurring basis Level 2	Dec. 31, 2013 Fair value measurements on a recurring basis Level 2	Mar. 31, 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	Mar. 31, 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	Mar. 31, 2014 Fair value measurements on a recurring basis Level 2 Bank	Dec. 31, 2013 Fair value measurements on a recurring basis Level 2 Bank	Mar. 31, 2014 Fair value measurements on a recurring basis Level 2 Other	Dec. 31, 2013 Fair value measurements on a recurring basis Level 2 Other	Mar. 31, 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	Mar. 31, 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	Mar. 31, 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	Mar. 31, 2014 Fair value measurements on a recurring basis Level 1	Dec. 31, 2013 Fair value measurements on a recurring basis Level 1	Mar. 31, 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	Mar. 31, 2014 Fair value measurements on a nonrecurring basis American Savings Bank (ASB)	Mar. 31, 2013 Fair value measurements on a nonrecurring basis American Savings Bank (ASB)	Mar. 31, 2014 Fair value measurements on a nonrecurring basis Estimated fair value	Dec. 31, 2013 Fair value measurements on a nonrecurring basis Estimated fair value	Mar. 31, 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	517,534,000	529,007,000	431,014,000	369,444,000	86,520,000	80,973,000	0	78,590,000							517,534,000	529,007,000			431,014,000	369,444,000	86,520,000	80,973,000	0	78,590,000
Derivative assets
Derivative assets									212,000	531,000	199,000	488,000	13,000	43,000											22,000	98,000	22,000	98,000
Derivative liabilities
Derivative liabilities									7,000	26,000	5,000	24,000	2,000	2,000													0	0
Loans																															5,000,000	4,000,000	5,000,000	4,000,000
Adjustments to fair value of loans held for sale																													$ 0	$ 0